10.34choicedemo.java

来自「JAVA程序设计的源代码」· Java 代码 · 共 43 行

import java.applet.*;
import java.awt.event.*;
import java.awt.*;
public class ChoiceDemo extends Applet implements ItemListener
{
TextField t;
Choice c;
public void init()
{
add(t=new TextField(30));
c=new Choice();    //创建下拉列表
c.addItem("Thomas");    //向下拉列表中添加选项
c.addItem("Joseph");
c.addItem("Robin");
c.addItem("Clinton");
c.addItem("John");
c.addItem("Jennifer");
c.addItem("Jannet");
c.addItemListener(this);    //设置事件监听
add(c);
}
public void itemStateChanged(ItemEvent e)    //事件处理函数
{
if(e.getItemSelectable()==c)
{
if(c.getSelectedItem().equals("Thomas"))    //获取下拉列表选中内容
t.setText("Hai Thomas");
if(c.getSelectedItem().equals("Joseph"))
t.setText("Hai Joseph");
if(c.getSelectedItem().equals("Robin"))
t.setText("Hai Robin");
if(c.getSelectedItem().equals("Clinton"))
t.setText("Hai Clinton");
if(c.getSelectedItem().equals("John"))
t.setText("Hai John");
if(c.getSelectedItem().equals("Jennifer"))
t.setText("Hai Jennifer");
if(c.getSelectedItem().equals("Jannet"))
t.setText("Hai Jannet");
}
}
}