import java.awt.Color;
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import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;
public class game21 extends JFrame {
private JLabel label_2;
private int number;
private int sum;
final JLabel label = new JLabel();
final JLabel label_1 = new JLabel();
public static void main(String[] args) {
new game21();
}
public game21() {
super("21点？！");
getContentPane().setLayout(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent arg0) {
onClick();
}
});
button.setText("出牌");
button.setBounds(170, 350, 106, 28);
getContentPane().add(button);
label.setBorder(new LineBorder(Color.black, 1, false));
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setFont(new Font("", Font.BOLD, 26));
label.setText("背面");
label.setBounds(158, 81, 137, 153);
getContentPane().add(label);
label_1.setText("你已经拥有的牌:");
label_1.setBounds(109, 22, 270, 45);
getContentPane().add(label_1);
this.setBounds(200, 300, 501, 528);
this.setVisible(true);
getContentPane().add(getLabel_2());
}
public int randNumber() {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
return (int) (Math.random() * 10 + 1);
}
public void onClick() {
number = this.randNumber();
this.sum += number;
label.setText("" + number);
String strTemp = this.label_1.getText();
strTemp += "" + number + " ";
label_1.setText(strTemp);
String temp = "合计：" + sum;
label_2.setText(temp);
isWin();
}
public void isWin() {
if (sum 21) {
JOptionPane.showMessageDialog(this, "你输了");
clear();
return;
} else if (sum == 21) {
JOptionPane.showMessageDialog(this, "你赢了");
clear();
return;
} else {
int i = JOptionPane.showOptionDialog(this, "是否继续？", "提示",
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.INFORMATION_MESSAGE, null, null, null);
if (i == JOptionPane.OK_OPTION) {
onClick();
} else
return;
}
}
private void clear() {
label_2.setText("合计：");
sum = 0;
number = 0;
label_1.setText("你已经拥有的牌:");
}
/**
* @return
*/
protected JLabel getLabel_2() {
if (label_2 == null) {
label_2 = new JLabel();
label_2.setText("合计:");
label_2.setBounds(313, 35, 66, 18);
}
return label_2;
}
}
真好无聊中。。
在安装jdk文件路径下的src.zip可以查看。。。
在eclipse 里面也可以，只要按着ctrl 键 将鼠标 放到想看的类上在点击左键就能进入到定义那个类的里面去了。。。
你可以试试！！
不过我觉得如果你是初学者的话，看这些会很有压力。。。
你可以在CSDN下载频道去搜 Java 酒店管理系统 或 图书馆 这样的关键字，那里经常有人分享代码模版之类
// My car shop.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class carshop extends JFrame
{
// JPanel to hold all pictures
private JPanel windowJPanel;
private String[] cars = { "","阿斯顿马丁", "美洲虎", "凯迪拉克",
"罗孚", "劳斯莱斯","别克"};
private int[] jiage = { 0,150000, 260000, 230000,
140000, 290000, 150000};
// JLabels for first snack shown
private JLabel oneJLabel;
private JLabel oneIconJLabel;
// JLabels for second snack shown
private JLabel twoJLabel;
private JLabel twoIconJLabel;
// JLabels for third snack shown
private JLabel threeJLabel;
private JLabel threeIconJLabel;
// JLabels for fourth snack shown
private JLabel fourJLabel;
private JLabel fourIconJLabel;
// JLabels for fifth snack shown
private JLabel fiveJLabel;
private JLabel fiveIconJLabel;
// JLabels for sixth snack shown
private JLabel sixJLabel;
private JLabel sixIconJLabel;
// JTextField for displaying snack price
private JTextArea displayJTextArea;
// JLabel and JTextField for user input
private JLabel inputJLabel;
private JComboBox selectCountryJComboBox;
private JLabel inputJLabel2;
private JTextField inputJTextField2;
// JButton to enter user input
private JButton enterJButton;
//JButton to clear the components
private JButton clearJButton;
// no-argument constructor
public carshop()
{
createUserInterface();
}
// create and position GUI components; register event handlers
private void createUserInterface()
{
// get content pane for attaching GUI components
Container contentPane = getContentPane();
// enable explicit positioning of GUI components
contentPane.setLayout( null );
// set up windowJPanel
windowJPanel = new JPanel();
windowJPanel.setBounds( 10, 20, 340, 200 );
windowJPanel.setBorder( new LineBorder( Color.BLACK ) );
windowJPanel.setLayout( null );
contentPane.add( windowJPanel );
// set up oneIconJLabel
oneIconJLabel = new JLabel();
oneIconJLabel.setBounds( 10, 20, 100, 65 );
oneIconJLabel.setIcon( new ImageIcon( "images/阿斯顿马丁.jpg" ) );
windowJPanel.add( oneIconJLabel );
// set up oneJLabel
oneJLabel = new JLabel();
oneJLabel.setBounds( 10, 60, 100, 70 );
oneJLabel.setText( "阿斯顿马丁" );
oneJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( oneJLabel );
// set up twoIconJLabel
twoIconJLabel = new JLabel();
twoIconJLabel.setBounds( 120, 20, 100, 65 );
twoIconJLabel.setIcon( new ImageIcon( "images/美洲虎.jpg" ) );
windowJPanel.add( twoIconJLabel );
// set up twoJLabel
twoJLabel = new JLabel();
twoJLabel.setBounds( 110, 60, 100, 70 );
twoJLabel.setText( "美洲虎" );
twoJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( twoJLabel );
// set up threeIconJLabel
threeIconJLabel = new JLabel();
threeIconJLabel.setBounds( 230, 20, 100, 65 );
threeIconJLabel.setIcon( new ImageIcon(
"images/凯迪拉克.jpg" ) );
windowJPanel.add( threeIconJLabel );
// set up threeJLabel
threeJLabel = new JLabel();
threeJLabel.setBounds( 230, 60, 100, 70);
threeJLabel.setText( "凯迪拉克" );
threeJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( threeJLabel );
// set up fourIconJLabel
fourIconJLabel = new JLabel();
fourIconJLabel.setBounds( 10, 100, 100, 65 );
fourIconJLabel.setIcon( new ImageIcon( "images/罗孚.jpg" ) );
windowJPanel.add( fourIconJLabel );
// set up fourJLabel
fourJLabel = new JLabel();
fourJLabel.setBounds( 10, 150, 50, 70 );
fourJLabel.setText( "罗孚" );
fourJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( fourJLabel );
// set up fiveIconJLabel
fiveIconJLabel = new JLabel();
fiveIconJLabel.setBounds( 120, 100, 100, 65 );
fiveIconJLabel.setIcon( new ImageIcon(
"images/劳斯莱斯.jpg" ) );
windowJPanel.add( fiveIconJLabel );
// set up fiveJLabel
fiveJLabel = new JLabel();
fiveJLabel.setBounds( 110, 150, 100, 70 );
fiveJLabel.setText( "劳斯莱斯" );
fiveJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( fiveJLabel );
// set up sixIconJLabel
sixIconJLabel = new JLabel();
sixIconJLabel.setBounds( 230, 100, 100, 65 );
sixIconJLabel.setIcon( new ImageIcon( "images/别克.jpg" ) );
windowJPanel.add( sixIconJLabel );
// set up sixJLabel
sixJLabel = new JLabel();
sixJLabel.setBounds( 230, 150, 100, 70 );
sixJLabel.setText( "别克" );
sixJLabel.setHorizontalAlignment( JLabel.CENTER );
windowJPanel.add( sixJLabel );
// set up enterJButton
enterJButton = new JButton();
enterJButton.setBounds( 390, 160, 135, 30 );
enterJButton.setText( "Enter" );
contentPane.add( enterJButton );
enterJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when enterJButton is clicked
public void actionPerformed( ActionEvent event )
{
enterJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end call to addActionListener
// set up clearJButton
clearJButton = new JButton();
clearJButton.setBounds( 390, 200, 135, 30 );
clearJButton.setText( "Clear" );
contentPane.add( clearJButton );
// set up inputJLabel
inputJLabel = new JLabel();
inputJLabel.setBounds( 390, 25, 135, 25 );
inputJLabel.setText( "Please make selection:" );
contentPane.add( inputJLabel );
selectCountryJComboBox = new JComboBox( cars );
selectCountryJComboBox.setBounds( 390, 50, 135, 21 );
selectCountryJComboBox.setMaximumRowCount( 3 );
contentPane.add( selectCountryJComboBox );
// set up inputJTextField
inputJLabel2 = new JLabel();
inputJLabel2.setBounds( 390, 80, 150, 20 );
inputJLabel2.setText( "Input the Numble:" );
contentPane.add( inputJLabel2 );
// set up inputJTextField
inputJTextField2 = new JTextField();
inputJTextField2.setBounds( 390, 100, 135, 25 );
inputJTextField2.setHorizontalAlignment( JTextField.RIGHT );
contentPane.add( inputJTextField2 );
clearJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when clearJButton is clicked
public void actionPerformed( ActionEvent event )
{
clearJButtonActionPerformed( event );
}
} // end anonymous inner class
);
// set up displayJTextField
displayJTextArea = new JTextArea();
displayJTextArea.setBounds( 10, 237,515, 70 );
displayJTextArea.setEditable( false );
contentPane.add( displayJTextArea );
// set properties of application's window
setTitle( "My car Shop" ); // set title bar string
setSize( 550, 360 ); // set window size
setVisible( true ); // display window
} // end method createUserInterface
private void clearJButtonActionPerformed( ActionEvent event )
{
// clear the JTextFields
inputJTextField2.setText( "" );
displayJTextArea.setText("");
} // end method clearJButtonActionPerformed
private void enterJButtonActionPerformed( ActionEvent event )
{
double z;
double c;
int x;
int y;
x=selectCountryJComboBox.getSelectedIndex();
y=Integer.parseInt(inputJTextField2.getText());
double discountRate;
int amount = Integer.parseInt( inputJTextField2.getText());
switch (amount/5)
{
case 0:
discountRate = 0;
break;
case 1:
discountRate = 1;
break;
case 2:
discountRate = 2;
break;
case 3:
discountRate = 3;
break;
default:
discountRate = 4;
} // end switch statement
c=1-discountRate/100;
z=jiage[x]*y*c;
displayJTextArea.append("你选择的是："+cars[x]+"；"+
"它的单价是："+jiage[x]+"；" +"你购买该产品的数量是："+y+"，" +"\n"+"该数量的折扣是："
+discountRate + " %"+"；"+"本次消费的总价格是："+z+"元"+"!"+"\n");
}
public static void main( String args[] )
{
carshop application = new carshop();
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end method main
} // end class carshop
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ConstructFrame extends JFrame
{
private static final long serialVersionUID = 1L;
String value1="",result,value2="";
int flag=0,fix=0,sum=1;
Boolean happy;
JTextField text=new JTextField(30);
int flagsum=0;
Container c=getContentPane();
JButton buttonx;
ConstructFrame()
{ super("计算器");
c.setLayout(null);
c.setBackground(Color.blue);
this.setSize(400, 400);
c.add(text);
text.setHorizontalAlignment(JTextField.RIGHT);
final JButton buttonx=new JButton("BackSpace");
c.add(buttonx);
buttonx.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
int count=0;
String temp;
if(flag==0)
{
count=value1.length();
if(count!=1)
temp=value1.substring(0, count-1);
else
temp="0";
value1=temp;
}
else
{
count=value2.length();
if(count!=1)
temp=value2.substring(0, count-1);
else
temp="0";
value2=temp;
}
text.setText(temp);
}
});
final JButton buttony=new JButton("CE");
c.add(buttony);
buttony.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
value1="";
value2="";
flag=0;
text.setText("0");
}
});
final JButton button1=new JButton("1");
c.add(button1);
button1.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+1;
temp=value1;
}
else
{
value2=value2+1;
temp=value2;
}
text.setText(temp);
}
});
final JButton button2=new JButton(" 2 ");
c.add(button2);
button2.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+2;
temp=value1;
}
else
{
value2=value2+2;
temp=value2;
}
text.setText(temp);
}
});
final JButton button3=new JButton("3");
c.add(button3);
button3.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+3;
temp=value1;
}
else
{
value2=value2+3;
temp=value2;
}
text.setText(temp);
}
});
final JButton button4=new JButton("4");
c.add(button4);
button4.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+4;
temp=value1;
}
else
{
value2=value2+4;
temp=value2;
}
text.setText(temp);
}
});
final JButton button5=new JButton("5");
c.add(button5);
button5.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+5;
temp=value1;
}
else
{
value2=value2+5;
temp=value2;
}
text.setText(temp);
}
});
final JButton button6=new JButton("6");
c.add(button6);
button6.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+6;
temp=value1;
}
else
{
value2=value2+6;
temp=value2;
}
text.setText(temp);
}
});
final JButton button7=new JButton("7");
c.add(button7);
button7.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+7;
temp=value1;
}
else
{
value2=value2+7;
temp=value2;
}
text.setText(temp);
}
});
final JButton button8=new JButton("8");
c.add(button8);
button8.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+8;
temp=value1;
}
else
{
value2=value2+8;
temp=value2;
}
text.setText(temp);
}
});
final JButton button9=new JButton("9");
c.add(button9);
button9.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+9;
temp=value1;
}
else
{
value2=value2+9;
temp=value2;
}
text.setText(temp);
}
});
final JButton button0=new JButton("0");
c.add(button0);
button0.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+0;
temp=value1;
}
else
{
value2=value2+0;
temp=value2;
}
text.setText(temp);
}
});
final JButton buttonadd=new JButton(" + ");
c.add(buttonadd);
buttonadd.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=1;
flagsum=0;
}
});
final JButton buttonsubtract=new JButton(" - ");
c.add(buttonsubtract);
buttonsubtract.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=2;
flagsum=0;
}
});
final JButton buttoncheng=new JButton(" * ");
c.add(buttoncheng);
buttoncheng.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=3;
flagsum=0;
}
});
final JButton buttonchu=new JButton(" / ");
c.add(buttonchu);
buttonchu.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
flagsum=0;
fix=4;
}
});
final JButton buttonequal=new JButton(" = ");
c.add(buttonequal);
buttonequal.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
double temp1,temp2;
double temp=0;
flagsum=0;
temp1=Double.parseDouble(value1);
temp2=Double.parseDouble(value2);
flag=0;
switch(fix)
{
case 1: temp=temp1+temp2;break;
case 2: temp=temp1-temp2;break;
case 3: temp=temp1*temp2;break;
case 4: temp=temp1/temp2;break;
}
result=Double.valueOf(temp).toString();
value1=result;
value2="";
flag=1;
text.setText(result);
}
});
final JButton buttonpoint=new JButton(".");
c.add(buttonpoint);
buttonpoint.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(flagsum==0)
{
String temp;
if(flag==0 )
{
value1=value1+".";
temp=value1;
}
else
{
value2=value2+".";
temp=value2;
}
flagsum=1;
text.setText(temp);
}
}
});
JButton buttonz=new JButton("Start");
c.add(buttonz);
buttonz.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(sum%2==1)
{
happy=true;
text.setText("0.");
flag=0;
}
else
{
happy=false;
value1="";
value2="";
text.setText("");
}
text.setEnabled(happy);
button1.setEnabled(happy);
button2.setEnabled(happy);
button3.setEnabled(happy);
button4.setEnabled(happy);
button5.setEnabled(happy);
button6.setEnabled(happy);
button7.setEnabled(happy);
button8.setEnabled(happy);
button9.setEnabled(happy);
button0.setEnabled(happy);
buttonx.setEnabled(happy);
buttony.setEnabled(happy);
buttonadd.setEnabled(happy);
buttonsubtract.setEnabled(happy);
buttonpoint.setEnabled(happy);
buttonequal.setEnabled(happy);
buttoncheng.setEnabled(happy);
buttonchu.setEnabled(happy);
sum++;
}
});
button1.setEnabled(false);
button2.setEnabled(false);
button3.setEnabled(false);
button4.setEnabled(false);
button5.setEnabled(false);
button6.setEnabled(false);
button7.setEnabled(false);
button8.setEnabled(false);
button9.setEnabled(false);
button0.setEnabled(false);
buttonx.setEnabled(false);
buttony.setEnabled(false);
buttonadd.setEnabled(false);
buttonsubtract.setEnabled(false);
buttonpoint.setEnabled(false);
buttonequal.setEnabled(false);
buttoncheng.setEnabled(false);
buttonchu.setEnabled(false);
text.setEnabled(false);
text.setBounds(20, 20, 200, 40);
buttonx.setBounds(20, 60,100, 40);
buttony.setBounds(140, 60,100, 40);
buttonz.setBounds(260, 60,80, 40);
button1.setBounds(20, 120,60, 40);
button2.setBounds(100, 120,60, 40);
button3.setBounds(180, 120,60, 40);
buttonadd.setBounds(260, 120,60, 40);
button4.setBounds(20, 180,60, 40);
button5.setBounds(100, 180,60, 40);
button6.setBounds(180, 180,60, 40);
buttonsubtract.setBounds(260, 180,60, 40);
button7.setBounds(20, 240,60, 40);
button8.setBounds(100, 240,60, 40);
button9.setBounds(180, 240,60, 40);
buttoncheng.setBounds(260,240,60,40);
button0.setBounds(20, 300,60, 40);
buttonpoint.setBounds(100, 300, 60, 40);
buttonequal.setBounds(180,300,60, 40);
buttonchu.setBounds(260, 300,60, 40);
setVisible(true);
}
class MYMouseEvent extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
value1=e.toString();
text.setText(value1);
}
}
}
class Calutator
{
public static void main(String[] args)
{
new ConstructFrame();
}
}
你自己慢慢的看吧！
