java 中 JComboBox，JList,JScrollPane的用法

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/* * 功能：JComboBox，JList,JScrollPane *  */package com.haitao.gui;import javax.swing.*;import java.awt.*;public class Demo8_8 extends JFrame {//定义JPanel jp1,jp2;JLabel jl1,jl2;JComboBox jcb1;JList jlist;JScrollPane jsp;public static void main(String[] args) {Demo8_8 demo=new Demo8_8();}//构造函数public Demo8_8(){jp1=new JPanel();jp2=new JPanel();jl1=new JLabel("你的籍贯");jl2=new JLabel("旅游地点");String []jg={"北京","上海","天津","火星"};jcb1=new JComboBox(jg);String []dd={"九寨沟","故宫","长城","天安门"};jlist=new JList(dd);//设置你希望显示多少个选项jlist.setVisibleRowCount(2);jsp=new JScrollPane(jlist);//设置布局this.setLayout(new GridLayout(3,1));//添加组件jp1.add(jl1);jp1.add(jcb1);jp2.add(jl2);jp2.add(jsp);this.add(jp1);this.add(jp2);this.setSize(300,300);this.setLocation(20,20);this.setResizable(false);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);}}

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