java [24] 图形化 下拉框、列表框、和滚动窗格组件

package graph;
/*下拉框、
 * 列表框、
 * 滚动窗格组件*/

import java.awt.*;
import javax.swing.*;


public class demo8 extends JFrame{
	JPanel jp1,jp2;
	JLabel jl1,jl2;
	JComboBox jcb1;
	JList jlist;
	JScrollPane jsp;
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		demo8 demo = new demo8();
		
	}
	
	
	public demo8() {
		jp1 = new JPanel();
		jp2 = new JPanel();
		
		jl1 = new JLabel("你的籍贯：");
		jl2 = new JLabel("你喜欢的旅游地点");
		
		String[] jg = {"baijing","shanghai","tianjin","hubei"};
		jcb1 = new JComboBox(jg);
		
		String[] dd = {"jiuzaigou","gugong","emeisan","changcheng","tiananmen"};
		jlist = new JList<>(dd);
		//设置希望显示多少个选项
		jlist.setVisibleRowCount(3);
		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(300, 500);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.setVisible(true);
		
		
		
	}

}