choiceexample.java

来自「Java课程中所有的可运行程序 全部都是java课程中所涉及到的源码」· Java 代码 · 共 74 行

import java.awt.event.*;
import java.awt.*;
 public class ChoiceExample extends  Frame {

TextField txt;
Choice c1,c2;

public ChoiceExample(String ss){
    super(ss);
	c1=new Choice();
	c1.add("choice 1 no.1");
	c1.add("choice 1 no.2");
	c1.add("choice 1 no.3");

	c2=new Choice();
	c2.add("choice 2 no.1");
	c2.add("choice 2 no.2");
	c2.add("choice 2 no.3");

setLayout(new FlowLayout());
txt=new TextField("此处显示选择结果............");
c1.addItemListener(new ItemListener(){
  public void itemStateChanged(ItemEvent e){
  processAction(e);}
});
c2.addItemListener(new ItemListener(){
  public void itemStateChanged(ItemEvent e){
  processAction(e);}
});

	add(c1);
	add(c2);
	add(txt);

	}


	public void  processAction(ItemEvent e){
 String name=(String)e.getItem();
 if(e.getItemSelectable()==c1){
    if(name=="choice 1 no.1")
    {txt.setText("choice 1 no.1 selected!");}
    if(name=="choice 1 no.2")
    {txt.setText("choice 1 no.2 selected!");}
    if(name=="choice 1 no.3")
    {txt.setText("choice 1 no.3 selected!");}

    }

if(e.getItemSelectable()==c2){
    if(name=="choice 2 no.1")
    {txt.setText("choice 2 no.1 selected!");}
    if(name=="choice 2 no.2")
    {txt.setText("choice 2 no.2 selected!");}
    if(name=="choice 2 no.3")
    {txt.setText("choice 2 no.3 selected!");}

    }

 }

    public static void main(String args[]) {
        ChoiceExample nowFrame=new ChoiceExample("ChoiceExample ");
         nowFrame.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
    System.exit(0);
         }
  });
nowFrame.pack();
nowFrame.show();
    }

 }