java简单记事本代码

以下代码是一个完整的实现，你只要复制过去就可以了~~

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import java.io.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

import javax.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.util.*;

import java.text.*;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.undo.*;

import javax.swing.text.*;

public class Start

{

public static void main(String args[])

{

new TextPad();

}

}

class TextPad extends JFrame implements ActionListener

{

JTextArea jta=new JTextArea("小廖记事本:)",18,52);

JCheckBoxMenuItem mto1=new JCheckBoxMenuItem("自动换行",true);

String ss1=jta.getText();

UndoableEditListener ue=new UndoHander();

UndoManager undo = new UndoManager();

int StartFindPos=0,a=0,b=0;

GridBagConstraints gbc=new GridBagConstraints();

//Dimension dd=new Dimension();

// jta.getDocument().addUndoableEditListener(ue);

public TextPad()

{

//MyMenuListener ml=new MyMenuListener();

//JTextArea jta=new JTextArea("This is my textpad",18,52);

//System.out.println(dd.getHeight());

//System.out.println(dd.getWidth());

//System.out.println(this.getHeight());

//System.out.println(this.getWidth());

//System.out.println("OK");

this.setTitle("一个功能比较齐全的JAVA记事本");

this.setLocation(180,100);

jta.setLineWrap(true);

jta.setWrapStyleWord(true);

JPanel jp=new JPanel();

JScrollPane jsp=new JScrollPane(jta);

jp.add(jsp);

//Rectangle rt=new Rectangle(0,0,this.getWidth(),this.getHeight());

//jsp.setBounds(rt);

//System.out.println(this.getHeight());

//System.out.println(this.getWidth());

JMenu mf=new JMenu("文件(F)");

JMenuItem mtf1=new JMenuItem("新建");

mtf1.addActionListener(this);

JMenuItem mtf2=new JMenuItem("打开");

//mtf2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));

mtf2.addActionListener(this);

JMenuItem mtf3=new JMenuItem("保存");

//mtf3.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));

mtf3.addActionListener(this);

JMenuItem mtf4=new JMenuItem("另存为");

mtf4.addActionListener(this);

JMenuItem mtf5=new JMenuItem("退出");

mtf5.addActionListener(this);

JMenu me=new JMenu("编辑(E)");

JMenuItem mte1=new JMenuItem("撤消");

mte1.addActionListener(this);

jta.getDocument().addUndoableEditListener(ue);

if(undo.canUndo())

{

mte1.setEnabled(false);

}

JMenuItem mte2=new JMenuItem("剪切");

mte2.addActionListener(this);

JMenuItem mte3=new JMenuItem("复制");

mte3.addActionListener(this);

JMenuItem mte4=new JMenuItem("粘贴");

mte4.addActionListener(this);

//JMenuItem mte5=new JMenuItem("删除");

//mte5.addActionListener(this);

JMenuItem mte6=new JMenuItem("查找");

mte6.addActionListener(this);

//JMenuItem mte7=new JMenuItem("查找下一个");

JMenuItem mte8=new JMenuItem("替换");

mte8.addActionListener(this);

//JMenuItem mte9=new JMenuItem("转到");

JMenuItem mte10=new JMenuItem("全选");

mte10.addActionListener(this);

JMenuItem mte11=new JMenuItem("日期/时间");

mte11.addActionListener(this);

JMenu mo=new JMenu("格式(O)");

//JCheckBoxMenuItem mto1=new JCheckBoxMenuItem("自动换行(W)");

mto1.addActionListener(this);

JMenuItem mto2=new JMenuItem("字体");

mto2.addActionListener(this);

JMenu mv=new JMenu("查看(V)");

JMenuItem mtv1=new JMenuItem("状态栏");

mtv1.setEnabled(false);

JMenu mh=new JMenu("帮助(H)");

JMenuItem mth1=new JMenuItem("关于记事本");

mth1.addActionListener(this);

JMenuBar mb=new JMenuBar();

this.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

);

mb.add(mf);

mb.add(me);

mb.add(mo);

mb.add(mv);

mb.add(mh);

this.setJMenuBar(mb);

mf.add(mtf1);

mf.add(mtf2);

mf.add(mtf3);

mf.add(mtf4);

mf.addSeparator();

mf.add(mtf5);

me.add(mte1);

me.addSeparator();

me.add(mte2);

me.add(mte3);

me.add(mte4);

//me.add(mte5);

me.addSeparator();

me.add(mte6);

//me.add(mte7);

me.add(mte8);

//me.add(mte9);

me.addSeparator();

me.add(mte10);

me.add(mte11);

mo.add(mto1);

mo.add(mto2);

mv.add(mtv1);

mh.add(mth1);

this.getContentPane().add(jsp);

this.setSize(600,400);

this.setResizable(true);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("打开"))

{

try

{

Frame f=new Frame();

FileDialog fd=new FileDialog(f,"打开文件",FileDialog.LOAD);

fd.setVisible(true);

String fpath=fd.getDirectory();

String fname=fd.getFile();

BufferedReader br=new BufferedReader(new FileReader(fpath+fname));

jta.setText("");

String s=br.readLine();

while(s!=null)

{

jta.append(s+"\n");

s=br.readLine();

}

br.close();

}

catch(Exception ex)

{

}

}

if(e.getActionCommand().equals("保存"))

{

String fns=null;

Frame f=new Frame("保存");

FileDialog fd=new FileDialog(f,"保存文件",FileDialog.SAVE);

fd.setFile("*.txt");

fd.setVisible(true);

try

{

String savepath=fd.getDirectory();

String savename=fd.getFile();

if(savename!=null)

{

PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter(savepath+savename)));

pw.write(jta.getText(),0,jta.getText().length());

pw.flush();

}

}

catch(Exception esave)

{

}

}

if(e.getActionCommand().equals("新建"))

{

jta.setText("");

}

if(e.getActionCommand().equals("另存为"))

{

Frame f=new Frame("保存");

FileDialog fd=new FileDialog(f,"文件另存为",FileDialog.SAVE);

fd.setVisible(true);

try

{

String savepath=fd.getDirectory();

String savename=fd.getFile();

if(savename!=null)

{

PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter(savepath+savename)));

pw.write(jta.getText(),0,jta.getText().length());

pw.flush();

}

}

catch(Exception esave)

{

}

}

if(e.getActionCommand().equals("退出"))

{

String ss2=jta.getText();

if(!ss1.equals(ss2))

{

System.out.println("File is changed.");

}

System.exit(0);

}

if(e.getActionCommand().equals("撤消"))

{

try

{

undo.undo();

//System.out.println(undo.canUndo());

}

catch(Exception eundo)

{

}

}

if(e.getActionCommand().equals("剪切"))

{

jta.cut();

}

if(e.getActionCommand().equals("复制"))

{

jta.copy();

}

if(e.getActionCommand().equals("粘贴"))

{

jta.paste();

}

if(e.getActionCommand().equals("删除"))

{

}

if(e.getActionCommand().equals("全选"))

{

jta.selectAll();

}

if(e.getActionCommand().equals("查找"))

{

try

{

final JDialog jd=new JDialog(this,"查找",true);

GridBagLayout gbl=new GridBagLayout();

GridBagConstraints gbc=new GridBagConstraints();

gbc.weightx=0.5;

gbc.weighty=0.5;

gbc.gridwidth=1;

gbc.gridheight=1;

jd.getContentPane().setLayout(gbl);

jd.setSize(380,100);

jd.setResizable(false);

//jd.setDefaultLookAndFeelDecorated(true);

final JTextField jtf=new JTextField(15);

JLabel jlFind=new JLabel("查找内容:");

jd.getContentPane().add(jlFind);

JButton jbFind=new JButton("查找");

jbFind.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent efind)

{

String strA=jta.getText();

String strB=jtf.getText();

if(a=0)

{

a=strA.indexOf(strB,StartFindPos);

b=strB.length();

StartFindPos=a+b;

if(a==-1)

{

JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果",1);

a=0;

StartFindPos=0;

}

jta.select(a,StartFindPos);

}

}

}

);

JButton jbCancel=new JButton("取消");

jbCancel.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ejb)

{

jd.dispose();

}

}

);

jd.getContentPane().add(jtf);

jd.getContentPane().add(jbFind);

jd.getContentPane().add(jbCancel);

//jd.setResizable(false);

jd.setLocation(240,200);

jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

jd.setVisible(true);

}

catch(Exception efind)

{

}

}

if(e.getActionCommand().equals("替换"))

{

final JDialog jd=new JDialog(this,"替换",true);

GridBagLayout gbl=new GridBagLayout();

GridBagConstraints gbc=new GridBagConstraints();

gbc.weightx=1;

gbc.weighty=1;

gbc.gridwidth=1;

gbc.gridheight=1;

JLabel jlFind=new JLabel("查找:");

JLabel jp=new JLabel("替换内容:");

final JTextField jtf=new JTextField(15);

final JTextField jtf1=new JTextField(15);

jd.getContentPane().setLayout(gbl);

jd.setSize(330,150);

jd.setResizable(false);

final JButton jbReplace=new JButton("替换");

final JButton jbReplaceAll=new JButton("替换所有");

final JButton jbCancel=new JButton("取消");

final JButton jbFind=new JButton("查找");

gbc.gridx=0;

gbc.gridy=0;

jd.getContentPane().add(jlFind,gbc);

gbc.gridx=1;

gbc.gridy=0;

jd.getContentPane().add(jtf1,gbc);

gbc.gridx=2;

gbc.gridy=0;

jd.getContentPane().add(jbFind,gbc);

gbc.gridx=0;

gbc.gridy=1;

jd.getContentPane().add(jp,gbc);

gbc.gridx=1;

gbc.gridy=1;

jd.getContentPane().add(jtf,gbc);

gbc.gridx=2;

gbc.gridy=1;

jd.getContentPane().add(jbReplace,gbc);

gbc.gridx=2;

gbc.gridy=2;

jd.getContentPane().add(jbReplaceAll,gbc);

gbc.gridx=2;

gbc.gridy=3;

jd.getContentPane().add(jbCancel,gbc);

jbFind.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent efind)

{

String strA=jta.getText();

String strB=jtf1.getText();

if(a=0)

{

a=strA.indexOf(strB,StartFindPos);

//System.out.println(a+b);

b=strB.length();

StartFindPos=a+b;

if(a==-1)

{

JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果",1);

a=0;

StartFindPos=0;

}

jta.select(a,StartFindPos);

//System.out.println(StartFindPos);

}

}

}

);

jbReplace.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("替换"))

{

String strRepleace=jtf.getText();

jta.replaceSelection(strRepleace);

}

}

}

);

jbReplaceAll.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

while(a-1)

{

String strA=jta.getText();

String strB=jtf1.getText();

a=strA.indexOf(strB,StartFindPos);

if(a==-1)

{

break;

}

//System.out.println(a+b);

b=strB.length();

StartFindPos=a+b;

//System.out.println(StartFindPos);

jta.select(a,StartFindPos);

//System.out.println(StartFindPos);

String strRepleaceAll=jtf.getText();

jta.replaceSelection(strRepleaceAll);

StartFindPos=a+b;

}

JOptionPane.showMessageDialog(null, "全部替换完毕", "替换内容",1);

a=0;

StartFindPos=0;

}

}

);

jbCancel.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ejb)

{

jd.dispose();

}

}

);

jd.setLocation(240,200);

jd.setVisible(true);

jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

}

if(e.getActionCommand().equals("日期/时间"))

{

final JDialog jd=new JDialog(this,"插入日期");

JPanel jp1=new JPanel();

jp1.setLayout(new FlowLayout(FlowLayout.LEFT));

final JTextField jtf=new JTextField(10);

JButton jbOK=new JButton("确定");

JButton jbCancel=new JButton("取消");

//Calendar cl=Calendar.getInstance();

//DateFormat df=DateFormat.getInstance();

//String sdate1=df.format(cl.getTime());

//jtf.setText(sdate1);

jp1.add(jtf);

jp1.add(jbOK);

jp1.add(jbCancel);

jd.getContentPane().add(jp1,"North");

JPanel jp2=new JPanel();

jp2.setLayout(new FlowLayout(FlowLayout.LEFT));

final JCheckBox jcb1=new JCheckBox("格式一");

final JCheckBox jcb2=new JCheckBox("格式二");

final JCheckBox jcb3=new JCheckBox("格式三");

jp2.add(jcb1);

jp2.add(jcb2);

jp2.add(jcb3);

jd.getContentPane().add(jp2,"Center");

jd.setSize(220,120);

jd.setResizable(false);

jd.setLocation(240,200);

final SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

Calendar cl=Calendar.getInstance();

DateFormat df=DateFormat.getInstance();

final String sdate=df.format(cl.getTime());

jcb1.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("格式一"))

{

if(jcb1.isSelected())

{

try

{

SimpleDateFormat sdf1=new SimpleDateFormat("yy年MM月dd日");

Date d=sdf.parse(sdate);

jtf.setText(sdf1.format(d));

jcb2.setEnabled(false);

jcb3.setEnabled(false);

}

catch(Exception estyle1)

{

estyle1.printStackTrace();

}

}

else

{

jcb2.setEnabled(true);

jcb3.setEnabled(true);

}

try

{

System.out.println(jta.getLineStartOffset(3));

//System.out.println(jta.getLineOfOffset(346));

}

catch(Exception eee)

{

}

}

}

}

);

jcb2.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("格式二"))

{

if(jcb2.isSelected())

{

try

{

SimpleDateFormat sdf1=new SimpleDateFormat("yy/MM/dd");

Date d=sdf.parse(sdate);

jtf.setText(sdf1.format(d));

jcb1.setEnabled(false);

jcb3.setEnabled(false);

}

catch(Exception estyle2)

{

estyle2.printStackTrace();

}

}

else

{

jcb1.setEnabled(true);

jcb3.setEnabled(true);

}

//System.out.println(jcb1.isSelected());

}

}

}

);

jcb3.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("格式三"))

{

if(jcb3.isSelected())

{

jtf.setText(sdate);

jcb1.setEnabled(false);

jcb2.setEnabled(false);

}

else

{

jcb1.setEnabled(true);

jcb2.setEnabled(true);

}

//System.out.println(jcb1.isSelected());

}

}

}

);

jbOK.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(e.getActionCommand().equals("确定"))

{

int pos=jta.getCaretPosition();

jta.insert(jtf.getText(),pos);

}

}

}

);

jbCancel.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent ejb)

{

jd.dispose();

}

}

);

jd.setVisible(true);

jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

}

if(e.getActionCommand().equals("自动换行"))

{

if(mto1.getState())

{

jta.setLineWrap(true);

jta.setWrapStyleWord(true);

}

else

{

jta.setLineWrap(false);

jta.setWrapStyleWord(false);

}

//System.out.println("OK");

}

if(e.getActionCommand().equals("字体"))

{

final JDialog jd=new JDialog(this,"字体设置");

jd.setLocation(240,200);

//final JFrame jfontview=new JFrame();

GridBagLayout gbl=new GridBagLayout();

GridBagConstraints gbc=new GridBagConstraints();

JButton jbOK=new JButton("确定");

JButton jbCancel=new JButton("取消");

JTextField jtf1=new JTextField(6);

final JTextArea jtaview=new JTextArea(4,8);

//jfontview.getContentPane().add(jtaview);

final JTextField jtf2=new JTextField(6);

final JTextField jtf3=new JTextField(3);

JComboBox jcb1=new JComboBox();

final JComboBox jcb2=new JComboBox();

jcb2.addItem("BOLD");

jcb2.addItem("ITALIC");

jcb2.addItem("PLAIN");

//jcb2.addItem("BOLDITALIC");

jcb2.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

jtf2.setText((String)jcb2.getSelectedItem());

}

}

);

final JComboBox jcb3=new JComboBox();

jcb3.addItem("14");

jcb3.addItem("18");

jcb3.addItem("22");

jcb3.addItem("26");

jcb3.addItem("30");

jcb3.addItem("34");

jcb3.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

jtf3.setText((String)jcb3.getSelectedItem());

//jtaview.setText("SS");

// int fontsizeview=Integer.parseInt((String)jcb3.getSelectedItem());

//Font fontview=new Font("字体预览",Font.BOLD,fontsizeview);

//jtaview.setFont(fontview);

//jtaview.setEditable(false);

}

}

);

gbc.gridheight=1;

gbc.gridwidth=1;

//gbc.gridx=1;

//gbc.gridy=0;

gbc.weightx=0.5;

gbc.weighty=0.5;

jd.getContentPane().setLayout(gbl);

//JLabel jl1=new JLabel("预览:");

JLabel jl2=new JLabel("字型:");

JLabel jl3=new JLabel("大小:");

gbc.gridx=0;

gbc.gridy=0;

jd.getContentPane().add(jl2,gbc);

gbc.gridx=2;

gbc.gridy=0;

jd.getContentPane().add(jl3,gbc);

//gbc.gridx=4;

//gbc.gridy=0;

//jd.getContentPane().add(jl3,gbc);

gbc.gridx=0;

gbc.gridy=1;

jd.getContentPane().add(jtf2,gbc);

gbc.gridx=2;

gbc.gridy=1;

jd.getContentPane().add(jtf3,gbc);

//gbc.gridx=4;

// gbc.gridy=1;

//jd.getContentPane().add(jtf3,gbc);

gbc.gridx=0;

gbc.gridy=2;

jd.getContentPane().add(jcb2,gbc);

gbc.gridx=2;

gbc.gridy=2;

jd.getContentPane().add(jcb3,gbc);

//gbc.gridx=4;

//gbc.gridy=2;

//jd.getContentPane().add(jcb3,gbc);

gbc.gridx=4;

gbc.gridy=1;

jd.getContentPane().add(jbOK,gbc);

gbc.gridx=4;

gbc.gridy=2;

jd.getContentPane().add(jbCancel,gbc);

jbOK.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(jtf2.getText().equals("PLAIN"))

{

int fontsize=Integer.parseInt(jtf3.getText());

int fontstyle=0;

Font f=new Font("字体设置",fontstyle,fontsize);

jta.setFont(f);

// System.out.println(f.getFont("楷体_GB2312").getFontName());

}

if(jtf2.getText().equals("BOLD"))

{

int fontsize=Integer.parseInt(jtf3.getText());

int fontstyle=1;

Font f=new Font("字体设置",fontstyle,fontsize);

jta.setFont(f);

}

if(jtf2.getText().equals("ITALIC"))

{

int fontsize=Integer.parseInt(jtf3.getText());

int fontstyle=2;

Font f=new Font("字体设置",fontstyle,fontsize);

jta.setFont(f);

}

jd.dispose();

//System.out.println(fontstyle);

}

}

);

jbCancel.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

jd.dispose();

}

}

);

jd.setSize(200,120);

jd.setResizable(false);

jd.setVisible(true);

jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);

}

if(e.getActionCommand().equals("关于记事本"))

{

JOptionPane jop=new JOptionPane(null,JOptionPane.INFORMATION_MESSAGE);

jop.showMessageDialog(null,"小廖记事本","关于记事本",JOptionPane.OK_OPTION);

//System.out.println("OK");

}

}

class UndoHander implements UndoableEditListener

{

public void undoableEditHappened(UndoableEditEvent eundo)

{

undo.addEdit(eundo.getEdit());

}

}

}

JAVA记事本的源代码

我给你如下：/*

* WriteBoard.java

*

* Created on 2006年12月19日, 下午7:26

*/

/**

*

* @author LecH.giF

*/

import java.awt.datatransfer.*;

import java.awt.event.*;

import java.awt.*;

import java.io.*;

import java.awt.FileDialog;

public class WriteBoard extends java.awt.Frame {

Clipboard clipboard =null;

FileDialog fc = new FileDialog(this);

/** Creates new form WriteBoard */

public WriteBoard() {

clipboard = getToolkit().getSystemClipboard();

initComponents();

}

/** This method is called from within the constructor to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method is

* always regenerated by the Form Editor.

*/

// editor-fold defaultstate="collapsed" desc=" Generated Code "

private void initComponents() {

textArea1 = new java.awt.TextArea();

menuBar1 = new java.awt.MenuBar();

menu1 = new java.awt.Menu();

menuItem1 = new java.awt.MenuItem();

menuItem2 = new java.awt.MenuItem();

menuItem3 = new java.awt.MenuItem();

menuItem4 = new java.awt.MenuItem();

menuItem5 = new java.awt.MenuItem();

menu2 = new java.awt.Menu();

menuItem6 = new java.awt.MenuItem();

menuItem7 = new java.awt.MenuItem();

menuItem8 = new java.awt.MenuItem();

setTitle("WriteBoard");

addWindowListener(new java.awt.event.WindowAdapter() {

public void windowClosing(java.awt.event.WindowEvent evt) {

exitForm(evt);

}

});

add(textArea1, java.awt.BorderLayout.CENTER);

menu1.setLabel("Menu");

menuItem1.setLabel("\u65b0\u5efa");

menuItem1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

newText(evt);

}

});

menu1.add(menuItem1);

menuItem2.setLabel("\u6253\u5f00");

menuItem2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

open(evt);

}

});

menu1.add(menuItem2);

menuItem3.setLabel("\u4fdd\u5b58");

menuItem3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

menuItem3ActionPerformed(evt);

}

});

menu1.add(menuItem3);

menuItem4.setLabel("\u53e6\u5b58\u4e3a");

menuItem4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

menuItem4ActionPerformed(evt);

}

});

menu1.add(menuItem4);

menuItem5.setLabel("\u9000\u51fa");

menuItem5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

exit(evt);

}

});

menu1.add(menuItem5);

menuBar1.add(menu1);

menu2.setLabel("\u7f16\u8f91");

menuItem6.setLabel("\u526a\u5207");

menuItem6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

menuItem6ActionPerformed(evt);

}

});

menu2.add(menuItem6);

menuItem7.setLabel("\u590d\u5236");

menuItem7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

menuItem7ActionPerformed(evt);

}

});

menu2.add(menuItem7);

menuItem8.setLabel("\u7c98\u8d34");

menuItem8.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

menuItem8ActionPerformed(evt);

}

});

menu2.add(menuItem8);

menuBar1.add(menu2);

setMenuBar(menuBar1);

pack();

}// /editor-fold

private void menuItem4ActionPerformed(java.awt.event.ActionEvent evt) {

fc.show();

if(fc.getFile()!=null){

File file = new File(fc.getFile());

try {

PrintWriter pw = new PrintWriter(file);

pw.print(textArea1.getText());

pw.flush();

pw.close();

} catch (FileNotFoundException ex) {

ex.printStackTrace();

}

}

else{

return;

}

}

private void menuItem3ActionPerformed(java.awt.event.ActionEvent evt) {

fc.show();

if(fc.getFile()!=null){

File file = new File(fc.getFile());

try {

PrintWriter pw = new PrintWriter(file);

pw.print(textArea1.getText());

pw.flush();

pw.close();

} catch (FileNotFoundException ex) {

ex.printStackTrace();

}

}

else{

return;

}

}

private void menuItem8ActionPerformed(java.awt.event.ActionEvent evt) {

Transferable contents = clipboard.getContents(this);

DataFlavor flavor = DataFlavor.stringFlavor;

if(contents.isDataFlavorSupported(flavor))

try{

String str;

str=(String)contents.getTransferData(flavor);

textArea1.append(str);

}catch(Exception e){}

}

private void menuItem7ActionPerformed(java.awt.event.ActionEvent evt) {

String temp = this.textArea1.getSelectedText();

StringSelection text = new StringSelection(temp);

clipboard.setContents(text,null);

}

private void menuItem6ActionPerformed(java.awt.event.ActionEvent evt) {

String temp = this.textArea1.getSelectedText();

StringSelection text = new StringSelection(temp);

clipboard.setContents(text,null);

int start = textArea1.getSelectionStart();

int end = textArea1.getSelectionEnd();

textArea1.replaceRange("",start,end);

}

private void open(java.awt.event.ActionEvent evt) {

fc.show();

if(fc.getFile()!=null){

File file = new File(fc.getFile());

try {

FileReader fr = new FileReader(file);

BufferedReader br = new BufferedReader(fr);

String s;

try {

while((s= br.readLine())!=null){

textArea1.append(s+"\n");

}

fr.close();

br.close();

} catch (IOException ex) {

ex.printStackTrace();

}

} catch (FileNotFoundException ex) {

ex.printStackTrace();

}

}

else{

return;

}

}

private void newText(java.awt.event.ActionEvent evt) {

this.textArea1.setText("");

}

private void exit(java.awt.event.ActionEvent evt) {

System.exit(0);

}

/** Exit the Application */

private void exitForm(java.awt.event.WindowEvent evt) {

System.exit(0);

}

/**

* @param args the command line arguments

*/

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new WriteBoard().setVisible(true);

}

});

}

// Variables declaration - do not modify

private java.awt.Menu menu1;

private java.awt.Menu menu2;

private java.awt.MenuBar menuBar1;

private java.awt.MenuItem menuItem1;

private java.awt.MenuItem menuItem2;

private java.awt.MenuItem menuItem3;

private java.awt.MenuItem menuItem4;

private java.awt.MenuItem menuItem5;

private java.awt.MenuItem menuItem6;

private java.awt.MenuItem menuItem7;

private java.awt.MenuItem menuItem8;

private java.awt.TextArea textArea1;

// End of variables declaration

}

java简单记事本源代码 带解释

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

class test implements ActionListener

{

JFrame frame;

JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26,b27,b28,b29,b30,b31;

JTextArea ta;

JPanel p1,p2,p3,p4;

JMenuBar mb;

JMenu m1,m2,m3;

JMenuItem mt1,mt2,mt3,mt4,mt5,mt6,mt7;

JRadioButton rb1,rb2;

ButtonGroup bg;

Double d1=0.0,d2=0.0,d3=0.0,d4=1.0,d5=1.0;

String s1="",s2="",s3="",s4="";

int a=0;

char c1;

int i=0;

public static void main(String[] args)

{

test that=new test();

that.go();

}

public void go()

{

frame=new JFrame("计算器");

Container cp= frame.getContentPane();

cp.setLayout(new FlowLayout());

b1=new JButton("7");b2=new JButton("8");b3=new JButton("9");b4=new JButton("/");b5=new JButton("1/x");b6=new JButton("sin");b7=new JButton("log");

b8=new JButton("4");b9=new JButton("5");b10=new JButton("6");b11=new JButton("*");b12=new JButton("x^y");b13=new JButton("cos");b14=new JButton("ln");

b15=new JButton("1");b16=new JButton("2");b17=new JButton("3");b18=new JButton("-");b19=new JButton(new ImageIcon("lanying.gif"));b20=new JButton("tan");b21=new JButton("x^3");

b22=new JButton("0");b23=new JButton("+/-");b24=new JButton(".");b25=new JButton("+");b26=new JButton("√x");b27=new JButton("cot");b28=new JButton("x^2");

b29=new JButton("Backspace");b30=new JButton("C");b31=new JButton("=");

mb=new JMenuBar();

m1=new JMenu("文件(F)");m2=new JMenu("编辑(E)");m3=new JMenu("帮助(H)");

mt1=new JMenuItem("清零");mt2=new JMenuItem("退出");mt3=new JMenuItem("复制");mt4=new JMenuItem("粘贴");mt5=new JMenuItem("版本");mt6=new JMenuItem("标准型");mt7=new JMenuItem("科学型");

ta=new JTextArea(1,30);

p1=new JPanel();p2=new JPanel();p3=new JPanel();p4=new JPanel();

rb1=new JRadioButton("科学型");rb2=new JRadioButton("标准型");

bg=new ButtonGroup();

b1.setForeground(Color.blue);b1.setBackground(Color.white);b2.setForeground(Color.blue);b2.setBackground(Color.white);

b3.setForeground(Color.blue);b3.setBackground(Color.white);b8.setForeground(Color.blue);b8.setBackground(Color.white);

b9.setForeground(Color.blue);b9.setBackground(Color.white);b10.setForeground(Color.blue);b10.setBackground(Color.white);

b15.setForeground(Color.blue);b15.setBackground(Color.white);b16.setForeground(Color.blue);b16.setBackground(Color.white);

b17.setForeground(Color.blue);b17.setBackground(Color.white);b22.setForeground(Color.blue);b22.setBackground(Color.white);

b23.setForeground(Color.blue);b23.setBackground(Color.white);b24.setForeground(Color.blue);b24.setBackground(Color.white);

b4.setForeground(Color.red);b4.setBackground(Color.white);b11.setForeground(Color.red);b11.setBackground(Color.white);

b18.setForeground(Color.red);b18.setBackground(Color.white);b25.setForeground(Color.red);b25.setBackground(Color.white);

b5.setForeground(Color.blue);b5.setBackground(Color.white);b6.setForeground(Color.blue);b6.setBackground(Color.white);

b7.setForeground(Color.blue);b7.setBackground(Color.white);b12.setForeground(Color.blue);b12.setBackground(Color.white);

b13.setForeground(Color.blue);b13.setBackground(Color.white);b14.setForeground(Color.blue);b14.setBackground(Color.white);

b19.setForeground(Color.blue);b19.setBackground(Color.white);b20.setForeground(Color.blue);b20.setBackground(Color.white);

b21.setForeground(Color.blue);b21.setBackground(Color.white);b26.setForeground(Color.blue);b26.setBackground(Color.white);

b27.setForeground(Color.blue);b27.setBackground(Color.white);b28.setForeground(Color.blue);b28.setBackground(Color.white);

b29.setForeground(Color.red);b29.setBackground(Color.white);b30.setForeground(Color.red);b30.setBackground(Color.white);

b31.setForeground(Color.red);b31.setBackground(Color.white);

bg.add(rb1);bg.add(rb2);

p1.setBackground(Color.yellow);

cp.setBackground(Color.CYAN);

m1.setMnemonic(KeyEvent.VK_F);m2.setMnemonic(KeyEvent.VK_E);m3.setMnemonic(KeyEvent.VK_H);

m1.add(mt6);m1.add(mt7);m1.addSeparator();m1.add(mt1);m1.addSeparator();m1.add(mt2);m2.add(mt3);m2.addSeparator();m2.add(mt4);m3.add(mt5);

mb.add(m1);mb.add(m2);mb.add(m3);

frame.setJMenuBar(mb);

p2.setLayout(new GridLayout(4,7));

p3.setLayout(new GridLayout(1,3));

ta.setEditable(false);

p1.add(ta);

p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(b7);

p2.add(b8);p2.add(b9);p2.add(b10);p2.add(b11);p2.add(b12);p2.add(b13);p2.add(b14);

p2.add(b15);p2.add(b16);p2.add(b17);p2.add(b18);p2.add(b19);p2.add(b20);p2.add(b21);

p2.add(b22);p2.add(b23);p2.add(b24);p2.add(b25);p2.add(b26);p2.add(b27);p2.add(b28);

p3.add(b29);p3.add(b30);p3.add(b31);

Border etched=BorderFactory.createEtchedBorder();

Border border=BorderFactory.createTitledBorder(etched,"计算类型");

p4.add(rb1);p4.add(rb2);

p4.setBorder(border);

b2.setActionCommand("8");

b2.addActionListener(this);

cp.add(p1);cp.add(p4);cp.add(p2);cp.add(p3);

frame.setSize(400,330);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

b1.setActionCommand("7");

b1.addActionListener(this);

b2.setActionCommand("8");

b2.addActionListener(this);

b3.setActionCommand("9");

b3.addActionListener(this);

b4.setActionCommand("/");

b4.addActionListener(this);

b5.setActionCommand("1/x");

b5.addActionListener(this);

b6.setActionCommand("sin");

b6.addActionListener(this);

b7.setActionCommand("log");

b7.addActionListener(this);

b8.setActionCommand("4");

b8.addActionListener(this);

b9.setActionCommand("5");

b9.addActionListener(this);

b10.setActionCommand("6");

b10.addActionListener(this);

b11.setActionCommand("*");

b11.addActionListener(this);

b12.setActionCommand("x^y");

b12.addActionListener(this);

b13.setActionCommand("cos");

b13.addActionListener(this);

b14.setActionCommand("ln");

b14.addActionListener(this);

b15.setActionCommand("1");

b15.addActionListener(this);

b16.setActionCommand("2");

b16.addActionListener(this);

b17.setActionCommand("3");

b17.addActionListener(this);

b18.setActionCommand("-");

b18.addActionListener(this);

b19.setActionCommand("x!");

b19.addActionListener(this);

b20.setActionCommand("tan");

b20.addActionListener(this);

b21.setActionCommand("x^3");

b21.addActionListener(this);

b22.setActionCommand("0");

b22.addActionListener(this);

b23.setActionCommand("+/-");

b23.addActionListener(this);

b24.setActionCommand(".");

b24.addActionListener(this);

b25.setActionCommand("+");

b25.addActionListener(this);

b26.setActionCommand("√x");

b26.addActionListener(this);

b27.setActionCommand("cot");

b27.addActionListener(this);

b28.setActionCommand("x^2");

b28.addActionListener(this);

b29.setActionCommand("Backspace");

b29.addActionListener(this);

b30.setActionCommand("C");

b30.addActionListener(this);

b31.setActionCommand("=");

b31.addActionListener(this);

rb1.setActionCommand("kxx");

rb1.addActionListener(this);

rb2.setActionCommand("bzx");

rb2.addActionListener(this);

}

public void actionPerformed(ActionEvent e) //throws Exception

{

if (e.getActionCommand()=="bzx")

{

b5.setEnabled(false);b6.setEnabled(false);b7.setEnabled(false);

b12.setEnabled(false);b13.setEnabled(false);b14.setEnabled(false);

b19.setEnabled(false);b20.setEnabled(false);b21.setEnabled(false);

b26.setEnabled(false);b27.setEnabled(false);b28.setEnabled(false);

}

if (e.getActionCommand()=="kxx")

{

b5.setEnabled(true);b6.setEnabled(true);b7.setEnabled(true);

b12.setEnabled(true);b13.setEnabled(true);b14.setEnabled(true);

b19.setEnabled(true);b20.setEnabled(true);b21.setEnabled(true);

b26.setEnabled(true);b27.setEnabled(true);b28.setEnabled(true);

}

if (e.getActionCommand()=="1")

{

ta.append("1");

}

if (e.getActionCommand()=="2")

{

ta.append("2");

}

if (e.getActionCommand()=="3")

{

ta.append("3");

}

if (e.getActionCommand()=="4")

{

ta.append("4");

}

if (e.getActionCommand()=="5")

{

ta.append("5");

}

if (e.getActionCommand()=="6")

{

ta.append("6");

}

if (e.getActionCommand()=="7")

{

ta.append("7");

}

if (e.getActionCommand()=="8")

{

ta.append("8");

}

if (e.getActionCommand()=="9")

{

ta.append("9");

}

if (e.getActionCommand()=="0")

{

ta.append("0");

}

if (e.getActionCommand()=="+")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=1;

}

if (e.getActionCommand()=="-")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=2;

}

if (e.getActionCommand()=="*")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=3;

}

if (e.getActionCommand()=="/")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=4;

}

if (e.getActionCommand()=="=")

{

s2=ta.getText();

d2=Double.parseDouble(s2);

if(i==1)

{

d3=d1+d2;

ta.setText( d3.toString());

}

if(i==2)

{

d3=d1-d2;

ta.setText( d3.toString());

}

if(i==3)

{

d3=d1*d2;

ta.setText( d3.toString());

}

if(i==4)

{

if(d2==0.0)

ta.setText("ERROR");

else

{

d3=d1/d2;

ta.setText( d3.toString());

}

}

if (i==5)

{

s2=ta.getText();

d2 = Double.parseDouble(s2);

for (int l=1;l=d2 ; l++)

{

d5=d5*d1;

}

ta.setText( d5.toString());

}

}

if (e.getActionCommand()=="C")

{

ta.setText("");

d4=1.0;

d5=1.0;

}

/*if (e.getActionCommand()=="Backspace")

{

s3=ta.getText();

a=s3.length();

//ta.cut(ta.select(a-1,a));

s4=ta.getText(1,3);

ta.setText(s4);

}

*/

if (e.getActionCommand()=="1/x")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=1/d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()==".")

{

ta.append(".");

}

if (e.getActionCommand()=="+/-")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=0-d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^2")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=d1*d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^3")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=d1*d1*d1;

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x^y")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

ta.setText("");

i=5;

// d2=d1*d1*d1;

// ta.setText( d2.toString());

}

if (e.getActionCommand()=="√x")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=Math.sqrt(d1);

ta.setText( d2.toString());

}

if (e.getActionCommand()=="x!")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

if (d10)

{

ta.setText( "error");

}

else if (d1==0)

{

ta.setText( "0.0");

}

else {

for (int k=1;k=d1 ;k++ )

d4=d4*k;

ta.setText( d4.toString());

}

}

if (e.getActionCommand()=="sin")

{

s1=ta.getText();

d1 = Double.parseDouble(s1);

d2=Math.sin(3.1415926*d1/180);

ta.setText( d2.toString());

}

}

}

java记事本源代码

给你个做好了的Java的源程序的记事本，自己看看就行了的，不怎么难的···

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class MyNotepad implements ActionListener{

private JFrame frame=new JFrame("新记事本");

private JTextArea jta=new JTextArea();

private String result="";

private boolean flag=true;

private File f;

private JButton jb=new JButton("开始");

private JTextField jtf=new JTextField(15);

private JTextField jt=new JTextField(15);

private JButton jbt=new JButton("替换为");

private JButton jba=new JButton("全部替换");

private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");

private String value;

private int start=0;

private JFrame jf=new JFrame("查找");

private JFrame jfc=new JFrame("替换");

@Override

public void actionPerformed(ActionEvent e) {

String comm=e.getActionCommand();

if("新建".equals(comm)){

if(!(frame.getTitle().equals("新记事本"))){

if(!flag){

write();

newNew();

}else{

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

}

}

}else if(!(jta.getText().isEmpty())){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

newNew();

}

}else{

newNew();

}

}else if("打开".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

jfc.setDialogType(JFileChooser.OPEN_DIALOG);

int returnVal = jfc.showOpenDialog(null);

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

frame.setTitle(f.getName());

result=read();

flag=false;

value=result;

jta.setText(result);

}

}else if("保存".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

if(flag){

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

}

}else{

write();

}

}else if("另存".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"另存");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

write();

}

}else if("退出".equals(comm)){

System.exit(0);

}else if("撤销".equals(comm)){

jta.setText(value);

}else if("剪切".equals(comm)){

value=jta.getText();

jta.cut();

}else if("复制".equals(comm)){

jta.copy();

}else if("粘贴".equals(comm)){

value=jta.getText();

jta.paste();

}else if("删除".equals(comm)){

value=jta.getText();

jta.replaceSelection(null);

}else if("全选".equals(comm)){

jta.selectAll();

}else if("查找".equals(comm)){

value=jta.getText();

jf.add(jtf,BorderLayout.CENTER);

jf.add(jb,BorderLayout.SOUTH);

jf.setLocation(300,300);

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

}else if("替换".equals(comm)){

value=jta.getText();

GridLayout gl=new GridLayout(3,3);

JLabel jl1=new JLabel("查找内容:");

JLabel jl2=new JLabel("替换为:");

jfc.setLayout(gl);

jfc.add(jl1);

jfc.add(jtf);

jfc.add(jb);

jfc.add(jl2);

jfc.add(jt);

jfc.add(jbt);

JLabel jl3=new JLabel();

JLabel jl4=new JLabel();

jfc.add(jl3);

jfc.add(jl4);

jfc.add(jba);

jfc.setLocation(300,300);

jfc.pack();

jfc.setVisible(true);

jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

}else if("版本".equals(comm)){

JDialog jd=new JDialog(frame,"关于对话框");

jd.setSize(200,200);

JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");

jd.add(l,BorderLayout.CENTER);

jd.setLocation(100,200);

jd.setSize(300,300);

jd.setVisible(true);

// jd.pack();

jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

}else if("开始".equals(comm)||"下一个".equals(comm)){

String temp=jtf.getText();

int s=value.indexOf(temp,start);

if(value.indexOf(temp,start)!=-1){

jta.setSelectionStart(s);

jta.setSelectionEnd(s+temp.length());

jta.setSelectedTextColor(Color.GREEN);

start=s+1;

jb.setText("下一个");

// value=value.substring(s+temp.length());//不能截取字串

}else {

JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);

jf.dispose();

}

}else if("替换为".equals(comm)){

String temp=jtf.getText();

int s=value.indexOf(temp,start);

if(value.indexOf(temp,start)!=-1){

jta.setSelectionStart(s);

jta.setSelectionEnd(s+temp.length());

jta.setSelectedTextColor(Color.GREEN);

start=s+1;

jta.replaceSelection(jt.getText());

}else {

JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);

jf.dispose();

}

}else if("全部替换".equals(comm)){

String temp=jta.getText();

temp=temp.replaceAll(jtf.getText(), jt.getText());

jta.setText(temp);

}

}

public String read(){

String temp="";

try {

FileInputStream fis = new FileInputStream(f.getAbsolutePath());

byte[] b=new byte[1024];

while(true){

int num=fis.read(b);

if(num==-1)break;

temp=temp+new String(b,0,num);

}

fis.close();

} catch (Exception e1) {

e1.printStackTrace();

}

return temp;

}

public void write(){

try {

FileOutputStream fos=new FileOutputStream(f);

fos.write(jta.getText().getBytes());

fos.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public void newNew(){

frame.dispose();

new MyNotepad();

flag=true;

}

public MyNotepad(){

JMenuBar jmb=new JMenuBar();

String[] menuLab={"文件","编辑","帮助"};

String[][] menuItemLab={{"新建","打开","保存","另存","退出"},

{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},

{"版本"}};

for(int i=0;imenuLab.length;i++){

JMenu menu=new JMenu(menuLab[i]);

jmb.add(menu);

for(int j=0;jmenuItemLab[i].length;j++){

JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);

menu.add(jmi);

jmi.addActionListener(this);

}

}

frame.setJMenuBar(jmb);

jta.setLineWrap(true);//自动换行

JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板

frame.add(jsp);

jb.addActionListener(this);

jbt.addActionListener(this);

jba.addActionListener(this);

frame.setLocation(200,50);

frame.setSize(620,660);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new MyNotepad();

}

}

用java编写记事本程序,如何实现查找，替换

if(p.getActionCommand()=="查找 "||p.getSource()==findc) // 创建查找对话框;

{find=new Dialog(this,"查找");

JPanel p1=new JPanel();

JPanel p2=new JPanel();

findtxt=new JTextField(7);

p1.add(new JLabel("输入要查找字符:"));

p1.add(findtxt);

p2.add(findenter);

find.add("Center",p1);

find.add("South",p2);

find.setSize(200,100);

find.show();

}

if(p.getSource()==findenter) ///点击查找对话框的确定按钮后的事件处理

{

if(findtxt.getText().equals(""))

{find.dispose();}

else if(!findtxt.getText().equals(""))

{ find.dispose();

str=txt1.getText();

startp=str.indexOf(findtxt.getText());

endp=startp+findtxt.getText().length();

txt1.select(startp,endp);

m26.setEnabled(true);

newendp=endp;////////获取这次查找的终点

notfindmethod();

}

}

//////////////////////////////////////////////////////////

if(p.getActionCommand()=="查找下一个 ")

{

nexttemp=newendp; /////获取上次查找的终点做为未查找字符串的起点

String strall=txt1.getText();

txt1.select(nexttemp,strall.length()); /////选中所有未查找的字符串

strnext=txt1.getSelectedText();

newstartp=strnext.indexOf(findtxt.getText())+nexttemp;/////在未查找的字符串里搜索对应字符的在TXT1中的位置

newendp=newstartp+findtxt.getText().length();

txt1.select(newstartp,newendp); ////找到相应文本，并选择

notfindmethod();

}

if(p.getActionCommand()=="替换 ")

{m271.setEnabled(true);

replace=new Dialog(this,"替换"); // 创建替换对话框;

JPanel p1=new JPanel();

JPanel p2=new JPanel();

JPanel p3=new JPanel();

findtxt=new JTextField(7);

repltxt=new JTextField(7);

p1.add(new JLabel("输入原始字符:"));

p1.add(findtxt);

p2.add(new JLabel("输入替换字符:"));

p2.add(repltxt);

p3.add(replb);

replace.add("North",p1);

replace.add("Center",p2);

replace.add("South",p3);

replace.setSize(200,150);

replace.show();

}

if(p.getSource()==replb) ///点击替换对话框的确定按钮后的事件处理

{

replace.dispose();

str=txt1.getText();

startp=str.indexOf(findtxt.getText());

endp=startp+findtxt.getText().length();

txt1.replaceRange(repltxt.getText(),startp,endp);

newendp=endp; ///获取这次替换的终点

}

if(p.getActionCommand()=="替换下一个")

{nexttemp=newendp; /////获取上次查找的终点做为未查找字符串的起点

String strall=txt1.getText();

txt1.select(nexttemp,strall.length()); /////选中所有未查找的字符串

strnext=txt1.getSelectedText();

newstartp=strnext.indexOf(findtxt.getText())+nexttemp;/////在未查找的字符串里搜索对应字符的在TXT1中的位置

newendp=newstartp+findtxt.getText().length();

txt1.select(newstartp,newendp);

notfindmethod();

txt1.replaceRange(repltxt.getText(),newstartp,newendp);//替换字符

}

if(p.getActionCommand()=="全选 ")

{txt1.selectAll(); }

要看全部代码，我空间里有，自己看

java记事本实现查找功能

你有没有写监听器啊，继承ActionListener，按钮必须添加监听器后才会起作用。

重写actionPerformed(ActionEvent e) 方法，把你按钮执行的动作放在这个方法里才行。

本文名称：java记事本查找的代码 java记事本代码完整版
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