itemdemo.java

来自「一个十分好的java基础学习的课件」· Java 代码 · 共 32 行

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

public class ItemDemo extends Applet implements ItemListener
{   TextArea area=new TextArea(6,30);
    String Uni[ ]={"Tsinghua University","Peking University","Fudan University","Nankai University","Tianjin University"};
    Checkbox cb[ ]=new Checkbox[5];
    Checkbox radio[ ]=new Checkbox[5];

    public void init( )
    {   add(new Label("This is a Item example"));
        add(area);
        add(new Label("Please choose the University you like:"));
        for(int i=0;i<5;i++)
        {   cb[i]=new Checkbox(Uni[i]);
            add(cb[i]);
            cb[i].addItemListener(this);
        }

        CheckboxGroup cbGroup=new CheckboxGroup( );
        add(new Label("please choose the University you like most:"));
        for(int i=0;i<5;i++)
        {   radio[i]=new Checkbox(Uni[i],cbGroup,false);
            add(radio[i]);
            radio[i].addItemListener(this);
        }
    }
    public void itemStateChanged(ItemEvent e)
    {   area.append("you have chosen "+e.getItem( )+"\n");
    }
}