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  1. /*
  2.  * To change this license header, choose License Headers in Project Properties.
  3.  * To change this template file, choose Tools | Templates
  4.  * and open the template in the editor.
  5.  */
  6. package swingdemo;
  7.  
  8. import java.awt.FlowLayout;
  9. import java.awt.Font;
  10. import java.awt.HeadlessException;
  11. import java.awt.event.ActionEvent;
  12. import java.awt.event.ActionListener;
  13. import java.util.Random;
  14. import java.util.Vector;
  15. import javax.swing.BoxLayout;
  16. import javax.swing.JButton;
  17. import javax.swing.JComboBox;
  18. import javax.swing.JFrame;
  19. import javax.swing.JLabel;
  20. import javax.swing.JList;
  21. import javax.swing.JOptionPane;
  22. import javax.swing.JPanel;
  23. import javax.swing.JScrollPane;
  24.  
  25. /**
  26.  *
  27.  * @author hi
  28.  */
  29. public class JComboboxJListUI extends JFrame {
  30.     JComboBox cbo;
  31.     JList  jlist;
  32.     JButton jbt;
  33.  
  34.     public JComboboxJListUI() throws HeadlessException {
  35.         this.setSize(400,600);
  36.         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  37.         this.setLocationRelativeTo(null);
  38.         this.setVisible(true);
  39.         creatAndShow();
  40.         addEvent();
  41.     }
  42.  
  43.     private void creatAndShow() {
  44.         JPanel jpn = new JPanel();
  45.         jpn.setLayout(new BoxLayout(jpn,BoxLayout.Y_AXIS));
  46.  
  47.         String arr[] = {"Xuất sắc","Giỏi","Khá","Trung bình"};
  48.          cbo = new JComboBox(arr);
  49.          jpn.add(cbo);
  50.  
  51.  
  52.          JPanel jpnlist = new JPanel();
  53.          jpnlist.setLayout(new FlowLayout());
  54.          JLabel jlb = new JLabel("Chọn số : ");
  55.          jlb.setFont(new Font("Font.BOLD",20,20));
  56.          JList list = jlist();
  57.          JScrollPane sc = new JScrollPane(list,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
  58.  
  59.          jpnlist.add(jlb);
  60.          jpnlist.add(sc);
  61.  
  62.          JPanel jpnbt = new JPanel();
  63.          jbt = new JButton("OK");
  64.          jbt.setFont(new Font("Font.BOLD",20,20));
  65.          jpnbt.add(jbt);
  66.  
  67.  
  68.         jpn.add(jpnlist);
  69.         jpn.add(jpnbt);
  70.         this.getContentPane().add(jpn);
  71.  
  72.  
  73.     }
  74.  
  75.     public JList jlist()
  76.     {
  77.         Random rd = new Random();
  78.         Vector<Integer> vec = new Vector<>();
  79.         for(int i=0;i<100;i++)
  80.         {
  81.  
  82.                     int x = rd.nextInt(300);
  83.                     vec.add(x);
  84.                   }
  85.  
  86.       jlist = new JList(vec);
  87.         return jlist;
  88.     }
  89.  
  90.     public void addEvent()
  91.     {
  92.         cbo.addActionListener(new ActionListener() {
  93.             @Override
  94.             public void actionPerformed(ActionEvent e) {
  95.                 int vt = cbo.getSelectedIndex();
  96.                 if(vt!=-1)
  97.                 {
  98.                     JOptionPane.showMessageDialog(rootPane,"Vị trí được chọn : "+(vt+1)+" "+"Phần tử được chọn là :"+cbo.getSelectedItem());
  99.  
  100.                 }
  101.  
  102.                 else 
  103.                 {
  104.                     JOptionPane.showMessageDialog(rootPane,"Không có phần tử nào được chọn");
  105.                 }
  106.  
  107.             }
  108.         });
  109.  
  110.         jbt.addActionListener(new ActionListener() {
  111.             @Override
  112.             public void actionPerformed(ActionEvent e) {
  113.                 Object obj = jlist.getSelectedValue();
  114.                 int vt = jlist.getSelectedIndex();
  115.                 JOptionPane.showMessageDialog(rootPane, "Phần tử được chọn là " + obj + " "+ "Vị trí được chọn là : "+vt );
  116.  
  117.             }
  118.         });
  119.     }
  120.  
  121.     public static void main(String[] args) {
  122.         new JComboboxJListUI();
  123.     }
  124.  
  125. }
  126.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:29: error: class JComboboxJListUI is public, should be declared in a file named JComboboxJListUI.java
public class JComboboxJListUI extends JFrame {
       ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
stdout 
Standard output is empty
https://ideone.com/wMwkg2
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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