e5_15.java

java 初学者学习实例

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
class Mypanel1 extends Panel
{
  Checkbox box1,box2;CheckboxGroup sex;
  Mypanel1()
  {
  	sex = new  CheckboxGroup();
  	box1 = new Checkbox("男",false,sex);
  	box2 = new Checkbox("女",false,sex);
  	add(box1);add(box2); 
  }

}
public class E5_15 extends Applet implements ItemListener
{
	Mypanel1  panel1; TextField text;
	public void init()
	{
		setLayout(new GridLayout(1,2));
		panel1 = new Mypanel1();
	    panel1.box1.addItemListener(this);
	    panel1.box2.addItemListener(this);
		add(panel1); 
		text = new TextField();
		add(text);
		
	}
   	public void itemStateChanged(ItemEvent e)
	{
		if(e.getItemSelectable() == panel1.box1)
		{
			text.setText("Boy");
			
		}
		else
		{
			text.setText("girl");
		}
	}

}