caculatorframe.java

使用java实现简单的计算器界面

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.util.EventListener;
/**
 * Sample application using Frame.
 *
 * @author 
 * @version 1.00 07/08/06
 */
public class CaculatorFrame extends JFrame implements ActionListener {
    
    /**
     * The constructor.
     */ 
            
     JTextField jtf = new JTextField();
 	 JPanel jpl = new JPanel();
     public CaculatorFrame() 
     {
        //需要使用两种布局管理器,BorderLayout,GridLayout
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //增加文本框
        jtf.setHorizontalAlignment(JTextField.RIGHT);
        Container c = this.getContentPane();
        
        c.add(jtf,BorderLayout.NORTH);
        c.add(jpl,BorderLayout.CENTER);
        
        jpl.setLayout(new GridLayout(4,4));//首先设置16个按键的布局管理
        
        
        
        JButton b1 = null;
        b1 =  new JButton("1");
        b1.addActionListener(this);
        jpl.add(b1);
        
        JButton b2 = null;
        b2 =  new JButton("2");
        b2.addActionListener(this);
        jpl.add(b2);
        
        JButton b3 = null;
        b3 =  new JButton("3");
        b3.addActionListener(this);
        jpl.add(b3);
		
		JButton b4 = null;
        b4 =  new JButton("+");
        b4.addActionListener(this);
        jpl.add(b4);
        
        JButton b5 = null;
        b5 =  new JButton("4");
        b5.addActionListener(this);
        jpl.add(b5);

        JButton b6 = null;
        b6 =  new JButton("5");
        b6.addActionListener(this);
        jpl.add(b6);

        JButton b7 = null;
        b7 =  new JButton("6");
        b7.addActionListener(this);
        jpl.add(b7);

        JButton b8 = null;
        b8 =  new JButton("-");
        b8.addActionListener(this);
        jpl.add(b8);

        JButton b9 = null;
        b9 =  new JButton("7");
        b9.addActionListener(this);
        jpl.add(b9);

        JButton b10 = null;
        b10 =  new JButton("8");
        b10.addActionListener(this);
        jpl.add(b10);

        JButton b11 = null;
        b11 =  new JButton("9");
        b11.addActionListener(this);
        jpl.add(b11);

        JButton b12 = null;
        b12 =  new JButton("*");
        b12.addActionListener(this);
        jpl.add(b12);

        JButton b13 = null;
        b13 =  new JButton("0");
        b13.addActionListener(this);
        jpl.add(b13);

        JButton b14 = null;
        b14 =  new JButton(".");
        b14.addActionListener(this);
        jpl.add(b14);

        JButton b15 = null;
        b15 =  new JButton("=");
        b15.addActionListener(this);
        jpl.add(b15);

        JButton b16 = null;
        b16 =  new JButton("\\");
        b16.addActionListener(this);
       jpl.add(b16);   
		  
        
        MenuBar menuBar = new MenuBar();
        Menu menuFile = new Menu();
        MenuItem menuFileExit = new MenuItem();
        
        menuFile.setLabel("File");
        menuFileExit.setLabel("Exit");
        
        // Add action listener.for the menu button
        menuFileExit.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    CaculatorFrame.this.windowClosed();
                }
            }
        );
         
        
        menuFile.add(menuFileExit);
        menuBar.add(menuFile);
        
        setTitle("Caculator");
        setMenuBar(menuBar);
        setSize(new Dimension(400, 400));
        
        // Add window listener.
       /* this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    CaculatorFrame.this.windowClosed();
                }
            }
        );  */
    }
    
    
    /**
     * Shutdown procedure when run as an application.
     */
    protected void windowClosed() {
    	
    	// TODO: Check if it is safe to close the application
    	
        // Exit application.
        System.exit(0);
    }

	/**
	 * Method actionPerformed
	 *
	 *
	 * @param e
	 *
	 */
	public void actionPerformed(ActionEvent e) 
	{
		// TODO: Add your code here
       	jtf.setText(jtf.getText() + e.getActionCommand());//返回按钮文本上的信息

	}

}