radiotest.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 RadioTest extends Frame implements ItemListener
{
	TextField tf=new TextField(20);
	CheckboxGroup cg=new CheckboxGroup();
	Checkbox cb[]=new Checkbox[3];

	public RadioTest(String title) 
	{
		super(title);
		setLayout(new GridLayout(4,1));
		add(tf);
		
		String cbTitle[]={"Visual Basic60","Visual C++","Java"};
		for(int i=0;i<cb.length;i++)
		{
			cb[i]=new Checkbox(cbTitle[i],cg,false);
			cb[i].addItemListener(this);
			add(cb[i]);
		}
		
		setSize(300,200);
		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());
		*/
		
		Checkbox c=cg.getSelectedCheckbox();
		if(c!=null)
			tf.setText("你选择了"+c.getLabel());
		
	}

	public static void main(String args[])
	{
		new RadioTest("单选按钮示例");
	}
}