1.事件监听

package 事件监听;

import java.awt.*;

import java.awt.event.*;

public  class Frame2 extends Frame implements ActionListener{

 private Button button1;

 public Frame2()

 {

  super("个人信息");

      this.setSize(250,200);//设计组件的尺寸

      this.setLocation(800,600);//设计组件显示的位置

      this.setBackground(Color.blue);//设计背景颜色

      this.setLayout(new FlowLayout());//设计容器为流布局，居中

      this.add(new Label("姓名"));

      this.add(new TextField("唯梦",20));

      this.add(new Label("性别"));

      this.add(new TextField("女",20));

      this.add(new Label("民族"));

      this.add(new TextField("汉",20));

      this.add(new Label("年龄"));

      this.add(new TextField("20",20));

      button1=new Button("OK");

      this.add(button1);

      button1.addActionListener(this);

      this.addWindowListener(new WinClose());

      this.setVisible(true);

 }

 public void actionPerformed(ActionEvent ev)

 {

  if(ev.getSource()==button1)

  {

   System.out.print("welcome");

  }

 }

 public static void main(String arg[])

 {

  new Frame2();

 }

     class WinClose implements WindowListener

 {

  public void windowClosing(WindowEvent ev)

  {

   System.exit(0);

  }

  public void windowOpened(WindowEvent ev) {}

  public void windowActivated(WindowEvent ev) {}

  public void windowDeactivated(WindowEvent ev) {}

  public void windowClose(WindowEvent ev) {}

  public void windowIconified(WindowEvent ev) {}

  public void windowDeiconified(WindowEvent ev) {}

  @Override

  public void windowClosed(WindowEvent arg0) {

   // TODO 自动生成的方法存根

   

  }

 } 

 }

 

 

2.计算器界面

package 计算器;

import java.awt.BorderLayout; 

import java.awt.Container; 

import java.awt.GridLayout; 

import java.awt.event.ActionEvent; 

import java.awt.event.ActionListener; 

import java.awt.event.KeyAdapter; 

import java.awt.event.KeyEvent; 

 

import javax.swing.JButton; 

import javax.swing.JFrame; 

import javax.swing.JPanel; 

import javax.swing.JTextField; 

 

public class Jisuanqi extends JFrame { 

     

    public static void main(String[] args) {  

     Jisuanqi frame = new Jisuanqi(); 

         

        frame.setTitle("计算器"); 

        frame.setSize(300,400);

        frame.setResizable(false); 

        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);  

        frame.init();  

        frame.setVisible(true); 

    } 

     

    private void init()  

    { 

        textField = new JTextField();    

        textField.setEditable(false); 

        textField.setHorizontalAlignment (JTextField.RIGHT); 

        JPanel panel = new JPanel(); 

        panel.setLayout(new GridLayout(4, 4)); 

         

        Container container = getContentPane(); 

        container.add(textField, BorderLayout.NORTH); 

        container.add(panel, BorderLayout.CENTER); 

         

        panel.add(useButton('7')); 

        panel.add(useButton('8')); 

        panel.add(useButton('9')); 

        panel.add(useButton('+')); 

        panel.add(useButton('4')); 

        panel.add(useButton('5')); 

        panel.add(useButton('6')); 

        panel.add(useButton('-')); 

        panel.add(useButton('1')); 

        panel.add(useButton('2')); 

        panel.add(useButton('3')); 

        panel.add(useButton('*')); 

        panel.add(useButton('0')); 

        panel.add(useButton('.')); 

        panel.add(useButton('=')); 

        panel.add(useButton('/')); 

    } 

     

    public JButton useButton (final char key)  

    { 

        JButton button = new JButton(String.valueOf(key)); 

         

        button.addActionListener(new ActionListener() 

        { 

            public void actionPerformed(ActionEvent event) 

            { 

                JButton btn = (JButton) event.getSource(); 

                char key2 = btn.getText().charAt(0); 

                 

                action(key2); 

            } 

        }); 

        button.addKeyListener(new KeyAdapter() 

        { 

            public void keyReleased(KeyEvent event) 

            { 

                char key2 = event.getKeyChar (); 

                action(key2); 

            } 

        }); 

         

        return button; 

    } 

     

    private void action(char key2) 

    { 

        if(reop) 

        { 

            textField.setText(""); 

            reop = false; 

        } 

         

        switch(key2) 

        { 

            case '+': 

                a1 = Double.parseDouble(textField.getText()); 

                textField.setText(""); 

                operator = '+'; 

                break; 

            case '-': 

                a1 = Double.parseDouble(textField.getText()); 

                textField.setText(""); 

                operator = '-'; 

                break; 

            case '*': 

                a1= Double.parseDouble(textField.getText()); 

                textField.setText(""); 

                operator = '*'; 

                break; 

            case '/': 

                 a1= Double.parseDouble(textField.getText());  

                textField.setText(""); 

                operator = '/'; 

                break; 

            case '=': 

                reop = true; 

                a2 = Double.parseDouble(textField.getText()); 

                switch(operator) 

                { 

                    case '+': 

                        result = a1 + a2; 

                        break; 

                    case '-': 

                     result= a1 - a2; 

                        break; 

                    case '*': 

                     result = a1 * a2; 

                        break; 

                    case '/': 

                     result = a1 / a2; 

                        break; 

                    default: ; 

                } 

                textField.setText(String.valueOf(result)); 

                break; 

           case '1': 

            case '2': 

            case '3': 

            case '4': 

            case '5': 

            case '6': 

            case '7': 

            case '8': 

            case '9': 

            case '0': 

            case '.': 

                String text = textField.getText() + key2; 

                textField.setText(text); 

                break; 

            default: ; 

        } 

    } 

    private JTextField textField; 

    private double a1, a2, result; 

    private char operator; 

    private boolean reop = false; 

}}