下拉列表和滚动条

下拉列表框和滚动条

1. 在做选择时会遇到下拉列表和滚动条，关键词JLabel，JComboBox,JList,JScrollPane

2, 此案例示例如下

1. 增加的步骤：a，先定义标签 JLabel，这里标签有两个
         b，将区域和学历合成数组，合成数组后，下拉列表JComboBox，滚动条有两步先列成表Jlist，再定义滚动条中的数量，lb.setvisibleRowCount（数量），再定义滚动条
   JSCrollPanel(列表名);
    

String[] jg={"北京","天津","上海","重庆"};

             xlk=new JComboBox(jg);

            

             String[] xl={"高中","大专","本科","硕士","博士"};

             lb=new JList(xl);

             lb.setVisibleRowCount(3);//显示栏中的可见学历的数量，若未定义则全部显示

             gd=new JScrollPane(lb);

 

 

import java.awt.*;

import javax.swing.*;

 

public class L59  extends JFrame

{

         JPanel mb1,mb2;

         JLabel bq1,bq2;

         JComboBox xlk;

         JList lb;

         JScrollPane gd;

        

         public static void main(String[] args)

         {

                   L59 lx=new L59();

         }

        

         public L59()

         {

                  mb1=new JPanel();

                  mb2=new JPanel();

                 

                  bq1=new JLabel("籍贯");

             bq2=new JLabel("学历");

            

             String[] jg={"北京","天津","上海","重庆"};

             xlk=new JComboBox(jg);

            

             String[] xl={"高中","大专","本科","硕士","博士"};

             lb=new JList(xl);

             lb.setVisibleRowCount(3);//显示栏中的可见学历的数量

             gd=new JScrollPane(lb);

            

             this.setLayout(new GridLayout(2,1));

            

             mb1.add(bq1);  mb1.add(xlk);

                  mb2.add(bq2);  mb2.add(gd); 

                 

                 

                  this.add(mb1);         this.add(mb2);

                 

                   this.setTitle("用户调查");

                   this.setSize(200,190);

                   this.setLocation(300,280);

                   this.setResizable(false);//是否要最大化

                   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                   this.setVisible(true);    

                 

                 

         }

}