JavaSwing|JList带示例

// java Program to create a simple JList
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame
{
    //frame
    static JFrame f;
    //lists
    static JList b;
    //main class
    public static void main(String[] args)
    {
        //create a new frame
        f = new JFrame("frame");
        //create a object
        solve s=new solve();
        //create a panel
        JPanel p =new JPanel();
        //create a new label
        JLabel l= new JLabel("select the day of the week");
        //String array to store weekdays
        String week[]= { "Monday","Tuesday","Wednesday",
                         "Thursday","Friday","Saturday","Sunday"};
        //create list
        b= new JList(week);
        //set a selected index
        b.setSelectedIndex(2);
        //add list to panel
        p.add(b);
        f.add(p);
        //set the size of frame
        f.setSize(400,400);
        f.show();
    }
}


// java Program to create a list and add itemListener to it
// (program to select your birthday using lists) .
import javax.swing.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame implements ListSelectionListener
{
    //frame
    static JFrame f;
    //lists
    static JList b,b1,b2;
    //label
    static JLabel l1;
    //main class
    public static void main(String[] args)
    {
        //create a new frame
        f = new JFrame("frame");
        //create a object
        solve s=new solve();
        //create a panel
        JPanel p =new JPanel();
        //create a new label
        JLabel l= new JLabel("select your birthday");
        l1= new JLabel();
        //String array to store weekdays
        String month[]= { "January", "February", "March",
        "April", "May", "June", "July", "August",
        "September", "October", "November", "December"};
        //create a array for months and year
        String date[]=new String[31],year[]=new String[31];
        //add month number and year to list
        for(int i=0;i<31;i++)
        {
            date[i]=""+(int)(i+1);
            year[i]=""+(int)(2018-i);
        }
        //create lists
        b= new JList(date);
        b1= new JList(month);
        b2= new JList(year);
        //set a selected index
        b.setSelectedIndex(2);
        b1.setSelectedIndex(1);
        b2.setSelectedIndex(2);
        l1.setText(b.getSelectedValue()+" "+b1.getSelectedValue()
                              +" "+b2.getSelectedValue());
        //add item listener
        b.addListSelectionListener(s);
        b1.addListSelectionListener(s);
        b2.addListSelectionListener(s);
        //add list to panel
        p.add(l);
        p.add(b);
        p.add(b1);
        p.add(b2);
        p.add(l1);
        f.add(p);
        //set the size of frame
        f.setSize(500,600);
        f.show();
    }
    public void valueChanged(ListSelectionEvent e)
    {
        //set the text of the label to the selected value of lists
        l1.setText(b.getSelectedValue()+" "+b1.getSelectedValue()
                              +" "+b2.getSelectedValue());
    }
}