java下拉框，滚动条

 1 package com.soft.test;
 2 
 3 /**
 4  * 下拉列表、下拉框、滚动条的使用
 5  */
 6 
 7 import javax.swing.*;
 8 import java.awt.*;
 9 public class Dem5 extends JFrame {
10 
11 
12  private JPanel jp1, jp2;
13  private JLabel jlb1, jlb2;
14  private JComboBox jb1;
15  private JList jl;
16  private JScrollPane jsp;
17  
18  public Dem5() {
19   jp1 = new JPanel();
20   jp2 = new JPanel();
21   jlb1 = new JLabel("籍贯");
22   jlb2 = new JLabel("旅游地点");
23   
24   
25   String []jz = {"南昌","赣州","吉安","新余","鹰潭","景德镇","抚州"};
26   jb1 = new JComboBox(jz);
27   String []ly = {"三清山","将军园","龙虎山","庐山","腾王阁"};
28   
29   jl = new JList(ly);
30   jsp = new JScrollPane(jl);
31   jl.setVisibleRowCount(3);
32   
33   this.setLayout(new GridLayout(3, 1));
34   
35   jp1.add(jlb1);
36   jp1.add(jb1);
37   jp2.add(jlb2);
38   jp2.add(jsp);
39   this.add(jp1);
40   this.add(jp2);
41   this.setSize(300,300);
42   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
43   this.setLocation(300,300);
44   this.setVisible(true);
45   this.setResizable(false);  
46  }
47  
48  public static void main(String args[]) {
49   
50   Dem5 dem5 = new Dem5();
51  }
52 }