package jisuanqi_new;
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import java.awt.*;
import java.awt.event.*;
public class JiSuanQi_new implements ActionListener
{
Panel p1;//声明面板p1
TextField t1;//声明文本行t1
String[] label = {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};//声明标签数组label1存放按钮上的标签
Button[] b;//声明按钮数组存放16个按钮
private int i;//声明i以备后用
private String op1 = "0";//运算数备用
private String operator = "+";//运算符备用
private boolean append = false;//备用
public JiSuanQi_new()//构造方法
{
t1=new TextField();//初始化文本行t1
b = new Button[label.length];//初始化按钮数组b
p1=new Panel();//初始化面板p1
p1.setLayout(new GridLayout(4,4,4,4));//使面板选择网格布局管理器以备储存16个按钮（4行4列）
for(int i=0;ib.length;i++)//利用for循环把标签放在按钮上，使每个按钮添加事件监听器，在面板p1上添加上16个按钮
{
b[i] = new Button(label[i]);//把标签依次放在16个按钮上
b[i].addActionListener(this);//使每个按钮添加动作事件监听器
p1.add(b[i]); //分别将按钮添加到面板p1上
}
Frame f=new Frame("计算器1.0");//初始化窗口f,起名字计算器1.0
f.setLayout(new BorderLayout());//为窗口选择边界布局管理器
f.add(BorderLayout.NORTH,t1);//把文本行他添加到窗口的北部
f.add(BorderLayout.CENTER,p1);//把面吧p1添加到窗口的中间
f.addWindowListener(new WindowAdapter(){//给窗口f添加窗口事件监听器
public void windowClosing(WindowEvent eve){//运行窗口关闭方法
System.exit(0);//退出程序
}
});
f.setSize(250, 250);//设置窗口大小
f.setLocation(200,200);
f.setVisible(true);//显示窗口
}
public static void main(String args[])
{
new JiSuanQi_new(); //调用构造方法
}
public void actionPerformed(ActionEvent ae)
{//按钮被操作发生
String comm = ae.getActionCommand();//返回与此动作相关的命令字符串，即：使用者第一次点击的按钮是什么。
if("0123456789".indexOf(comm)!=-1)//如果相关命令字符串为0~9之间的数字则执行
{
if(append){
String temp = t1.getText();//新数字
t1.setText(temp+comm);
}else{ //因为此时append为false执行这个
t1.setText(comm); //将文本行t1设置为相关命令字符串（你按中的按钮代码）
append = true;//此时append=true若继续按按钮若继续按数字的话1.第一次的按话不会改变2.非第一次按得话会覆盖之前按得数字（即缺点：只能进行单个数字的计算）
}
}
else if(("+-*/".indexOf(comm)!=-1))//如果相关命令字符串为+-*/之间的数字则执行
{
//保存
//t1.setText(comm);
op1 = t1.getText();//把第一个数赋值给op1
operator = comm;//把命令字符串赋值给operator
append = false;//此时append为false即若继续按按钮若按数字的话将重复上面的动作，按符号的话将覆盖之前的符号
}
else if("=".equals(comm))//如果按的是=号，则按条件进行下面的运算
{
String op2 = t1.getText();//op2第二个数
double d1 = Double.parseDouble(op1);
double d2 = Double.parseDouble(op2);
if(operator.equals("+")){
d1 = d1 + d2 ;
}else if(operator.equals("-")){
d1 = d1 - d2;
}else if(operator.equals("*")){
d1 = d1 * d2;
}else {
d1 = d1 / d2;
}
t1.setText(d1+"");//显示计算结果
append = false;
}
else if(".".equals(comm))//若是.号继续按
{
String temp = t1.getText();
if(temp.indexOf(".")==-1){
t1.setText(temp+".");
append = true;
}
}
}
}
首先：采用什么技术实现
java语言可以使用awt 和swing等技术实现图形界面
推荐使用Swing，因为Swing比AWT更专业，更漂亮，组件更丰富，功能更强大。
2. 其次：分析采用什么布局
边界布局BorderLayout，配合表格布局GridLayout，既简单又美观
3. 最后：分析需求中需要用的组件
学生姓名 学号 显示信息 需要用到文本框JTextField
单选按钮 需要用到组件 JRadioButton
复选框 需要用到组件 JCheckBox
组合框 需要用到组件 JComboBox
图片效果
参考代码如下
//导入所需要的包
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.*;
import java.awt.*;
public class ClassFrame extends JFrame {// 写一个类继承自JFrame 窗体
// 定义组件
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField tfName, tfNum, allInfo;
private JRadioButton rb1, rb2;
private JCheckBox cb1, cb2, cb3;
private JComboBoxString t1, t2, t3;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ClassFrame frame = new ClassFrame();// 创建一个窗口实例
frame.setVisible(true);// 让该窗口实例可见
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* 窗口属性的设置,内部组件的初始化
*/
public ClassFrame() {
setTitle("选课ing...");//标题
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 设置关闭是退出JVM
setSize(450, 339);// 设置窗体大小
setLocationRelativeTo(null);// 窗体居中
contentPane = new JPanel();// 内容面板
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));// 设置布局
setContentPane(contentPane);
JPanel panel = new JPanel(new GridLayout(5, 1, 5, 10));//5行1列的表格布局
panel.setBorder(new TitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, null, null));
contentPane.add(panel, BorderLayout.CENTER);//给panel添加边框
JPanel panel_1 = new JPanel();
panel.add(panel_1);
JLabel label = new JLabel("姓名");
panel_1.add(label);
tfName = new JTextField();
panel_1.add(tfName);
tfName.setColumns(10);
JLabel label_2 = new JLabel("学号");
panel_1.add(label_2);
tfNum = new JTextField();
tfNum.setColumns(10);
panel_1.add(tfNum);
rb1 = new JRadioButton("男");
panel_1.add(rb1);
rb1.setSelected(true);//设置单选按钮中,默认选择的按钮
rb2 = new JRadioButton("女");
panel_1.add(rb2);
ButtonGroup bts = new ButtonGroup();//单选按钮需要加入同一个ButonGroup中才能生效
bts.add(rb1);
bts.add(rb2);
JPanel panel_2 = new JPanel();
panel.add(panel_2);
cb1 = new JCheckBox("高等数学");
panel_2.add(cb1);
t1 = new JComboBoxString();
t1.setModel(new DefaultComboBoxModelString(new String[] { "林老师", "赵老师", "孙老师" }));
panel_2.add(t1);
JPanel panel_3 = new JPanel();
panel.add(panel_3);
cb2 = new JCheckBox("世界经济");
panel_3.add(cb2);
t2 = new JComboBoxString();
t2.setModel(new DefaultComboBoxModelString(new String[] { "张老师", "刘老师" }));
panel_3.add(t2);
JPanel panel_4 = new JPanel();
panel.add(panel_4);
cb3 = new JCheckBox("音乐赏析");
panel_4.add(cb3);
t3 = new JComboBoxString();
t3.setModel(new DefaultComboBoxModelString(new String[] { "王老师", "周老师" }));
panel_4.add(t3);
JPanel panel_5 = new JPanel();
panel.add(panel_5);
JButton jbOk = new JButton("确定");
panel_5.add(jbOk);
JButton jbRest = new JButton("重填");
panel_5.add(jbRest);
JPanel panelSouth = new JPanel();
contentPane.add(panelSouth, BorderLayout.SOUTH);
JLabel labe = new JLabel("选课信息");
labe.setHorizontalAlignment(SwingConstants.LEFT);
panelSouth.add(labe);
allInfo = new JTextField();
allInfo.setColumns(30);
panelSouth.add(allInfo);
JPanel panelNorth = new JPanel();
contentPane.add(panelNorth, BorderLayout.NORTH);
JLabel labelTitle = new JLabel("学生选课界面");
labelTitle.setForeground(Color.DARK_GRAY);
labelTitle.setFont(new Font("宋体", Font.BOLD, 20));
panelNorth.add(labelTitle);
//给确定按钮添加事件处理代码
jbOk.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
StringBuilder info = new StringBuilder();
String name = tfName.getText();
String num = tfNum.getText();
String sex;
if (rb1.isSelected()) {
sex = "男";
} else {
sex = "女";
}
info.append(name + num + sex);
if (cb1.isSelected()) {
String c = cb1.getText();
String t = t1.getSelectedItem().toString();
info.append(" " + c + t);
}
if (cb2.isSelected()) {
String c = cb2.getText();
String t = t2.getSelectedItem().toString();
info.append(" " + c + t);
}
if (cb3.isSelected()) {
String c = cb3.getText();
String t = t3.getSelectedItem().toString();
info.append(" " + c + t);
}
allInfo.setText(info.toString());//把学生信息和选课信息放到文本框
}
});
//给重填按钮 设置事件处理代码
jbRest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tfName.setText("");
tfNum.setText("");
rb1.setSelected(true);
cb1.setSelected(false);
t1.setSelectedIndex(0);
cb2.setSelected(false);
t2.setSelectedIndex(0);
cb3.setSelected(false);
t3.setSelectedIndex(0);
allInfo.setText("");
}
});
}
}
package cn.com.baiDu;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
public class TestPanel extends JFrame{
JTabbedPane container;
public TestPanel (){
super("TestPanel");
init();
}
/**
* 界面组件初始化
*/
private void init(){
//定义界面大小
this.setSize(250, 250);
//定义界面出现在显示器中间
this.setLocationRelativeTo(null);
//定义界面右上角的x符号退出
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
//定义界面大小不可变
this.setResizable(false);
this.setName("Analyse");
//添加界面组件
setContainer();
//添加组件监听器
// addListener();
//定义界面可见,放测试方法里面了
// this.setVisible(true);
}
private void setContainer() {
//实例切换面板
container = new JTabbedPane();
//具体显示面板1
JPanel container1 = new JPanel();
//具体显示面板2
JPanel container2 = new JPanel();
//添加显示面板到切换面板
container.addTab("面板1", container1);
container.addTab("面板2", container2);
//添加切换面板到界面
this.add(container);
}
/**
* @param args
*/
public static void main(String[] args) {
TestPanel test = new TestPanel();
test.setVisible(true);
}
}
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator2 extends JPanel{
String[][] lables = {
{"CE","C","Back","%"},
{"7","8","9","/"},
{"4","5","6","*"},
{"1","2","3","+"},
{"0",".","=","-"}
};
JTextField display;
String commands = "CEBack%/*+-=";
private double result;
private String lastCommand;
private boolean start;
public static void main(String[] args) {
JFrame f = new JFrame("Test");
f.setContentPane(new Calculator2());
f.pack();
f.setVisible(true);
f.setDefaultCloseOperation(3);
}
public Calculator2(){
result = 0;
lastCommand = "=";
start = true;
GridBagLayout layout = new GridBagLayout();
GridBagConstraints gbc = new GridBagConstraints();
this.setLayout(layout);
gbc.insets = new Insets(1, 1, 1, 1);
gbc.gridheight = 1;
gbc.fill = GridBagConstraints.BOTH;
Dimension dimension = new Dimension(70, 30);
gbc.gridwidth = 4;
display = new JTextField();
display.setPreferredSize(dimension);
display.setHorizontalAlignment(JTextField.RIGHT);
this.add(display, gbc);
ActionListener insert = new InsertAction();
gbc.gridwidth = 1;
for (int i = 0; i lables.length; i++) {
for (int j = 0; j lables[0].length; j++) {
gbc.gridx = j;
gbc.gridy = i+1;
JButton b = new JButton(lables[i][j]);
if (j==3)
b.setForeground(Color.RED);
b.setPreferredSize(dimension);
b.addActionListener(insert);
this.add(b,gbc);
}
}
}
private class InsertAction implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
String input = e.getActionCommand();
if(commands.contains(input)){
if(start){
if(input.equals("-")){
display.setText(input);
start =false;
}
} else {
calculate(Double.parseDouble(display.getText()));
lastCommand = input;
start = true;
}
} else {
if(start){
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
}
private void calculate(double x) {
if (lastCommand.equals("+")) result +=x;
else if (lastCommand.equals("-")) result -=x;
else if (lastCommand.equals("*")) result *=x;
else if (lastCommand.equals("/")) result /=x;
else if (lastCommand.equals("=")) result =x;
display.setText("" + result);
}
}
