guidemo3.java

JAVA代码,是用来解决基本图像的程序.

/**
 * AWT Sample application
 *
 * @author 
 * @version 1.00 06/06/18
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUIDemo3 extends JPanel{
	JCheckBox right1;
	JCheckBox right2;
    JCheckBox right4;
    JCheckBox right8;
    StringBuffer choices;
    JLabel displayLabel;
    public GUIDemo3()
    {
    	right1=new JCheckBox("1");
    	right1.setMnemonic(KeyEvent.VK_4);
    	right1.setSelected(true);
    	right2=new JCheckBox("2");
    	right2.setMnemonic(KeyEvent.VK_3);
    	right2.setSelected(true);
    	right4=new JCheckBox("4");
    	right4.setMnemonic(KeyEvent.VK_2);
    	right4.setSelected(true);
    	right8=new JCheckBox("8");
    	right8.setMnemonic(KeyEvent.VK_1);
    	right8.setSelected(true);
    	//创建事件服务类CheckBoxListener的对象myListener
    	CheckBoxListener myListener =new CheckBoxListener();
    	//为right1,right2,right4,right8添加事件监听器
    	right1.addItemListener(myListener);
    	right2.addItemListener(myListener);
    	right4.addItemListener(myListener);
    	right8.addItemListener(myListener);
    	//初始化choices
    	choices=new StringBuffer("0000");
    	//创建标签对象
    	displayLabel=new JLabel(choices.toString());
    	JPanel checkPanel=new JPanel();
    	//将复选框按钮添加到checkPanel的同一列
    	checkPanel.setLayout(new GridLayout(0,1));
    	checkPanel.add(right1);
    	checkPanel.add(right2);
    	checkPanel.add(right4);
    	checkPanel.add(right8);
    	setLayout(new BorderLayout());
    	add(checkPanel,BorderLayout.WEST);
    	add(displayLabel,BorderLayout.CENTER);
    	setBorder(BorderFactory.createEmptyBorder(10,60,10,60));//设置边距
    }
    //复选框的事件服务类
    class CheckBoxListener implements ItemListener
    {
    	public void itemStateChanged(ItemEvent e)
    	{
    		int index=0;
    		char c='-';
    		Object source=e.getItemSelectable();
    		if(source==right8)
    		{
    			index=0;
    			c='8';
    		}
    		else if(source==right4)
    		{
    			index=1;
    			c='4';
    		}
    		else if(source==right2)
    		{
    			index=2;
    			c='2';
    		}
    		else if(source==right1)
    		{
    			index=3;
    			c='1';
    		}
    		if(e.getStateChange()==ItemEvent.DESELECTED)
    		c='-';
    		choices.setCharAt(index,c);
    		displayLabel.setText(choices.toString());
    	}
    }
    public static void main(String[] args) {
        
        JFrame frame = new JFrame("CheckBoxDemo");
        frame.addWindowListener(new WindowAdapter()
        {
        	public void windowClosing(WindowEvent e)
        	{
        		System.exit(0);
        	}
        });
        frame.setContentPane(new GUIDemo3());
        frame.pack();
        frame.setVisible(true);  
}
}