checkboxtest.java

这是清华大学编写的JAVA教材中所有题目的源代码！

import java.awt.*;
import java.awt.event.*;

class CheckboxTest extends Frame implements ItemListener,ActionListener
{
	TextField tf=new TextField(20);
	Checkbox cb[]=new Checkbox[3];
	Button btn=new Button("确定");

	public CheckboxTest(String title) 
	{
		super(title);
		setLayout(new GridLayout(5,1));
		add(tf);
		
		String cbTitle[]={"Visual Basic60","Visual C++","Java"};
		for(int i=0;i<cb.length;i++)
		{
			cb[i]=new Checkbox(cbTitle[i]);
			cb[i].addItemListener(this);
			add(cb[i]);
		}
		
		btn.addActionListener(this);
		add(btn);
		setSize(300,250);
		setVisible(true);
	}

	public void itemStateChanged(ItemEvent e)
	{
		Checkbox c=(Checkbox)e.getSource();
		
		if(e.getStateChange()==ItemEvent.SELECTED)
			tf.setText("你选择了"+c.getLabel());
		else if(e.getStateChange()==ItemEvent.DESELECTED)
			tf.setText("你取消了选择"+c.getLabel());
	}
	
	public void actionPerformed(ActionEvent e)
	{
		String str="你选择了";
		for(int i=0;i<cb.length;i++)
			if(cb[i].getState()==true)
				str=str+cb[i].getLabel()+",";
		tf.setText(str);
	}

	public static void main(String args[])
	{
		new CheckboxTest("复选框示例");
	}
}