Question

java图形用户界面

单击下拉列表，最下方文本框中显示下拉列表中的内容

例如：单击青岛，文本框中显示青岛
单击潍坊，文本框中显示潍坊

Answer 1

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

public class III extends Applet
{
boolean isStandalone = false;
BorderLayout borderLayout1 = new BorderLayout();
Panel panel1 = new Panel();
TextArea textArea1 = new TextArea();
Label label1 = new Label();
Choice choice1 = new Choice();
public void init()
{
try
{
jbInit();
}
catch(Exception e)
{
e.printStackTrace();
}
}
private void jbInit() throws Exception
{
this.setLayout(borderLayout1);
textArea1.setEditable(false);
label1.setText("你的籍贯: ");
choice1.addItemListener(new java.awt.event.ItemListener()
{
public void itemStateChanged(ItemEvent e)
{
choice1_itemStateChanged(e);
}
});
this.add(panel1, BorderLayout.NORTH);
panel1.add(label1, null);
choice1.add("青岛");
choice1.add("潍坊");
panel1.add(choice1, null);
this.add(textArea1, BorderLayout.CENTER);
}
void choice1_itemStateChanged(ItemEvent e)
{
textArea1.setText("你的籍贯是: "+e.getItem());
}
}