Java simulates a lottery program

Today using a program to simulate a lottery program that randomly extracts 7 numbers from 1-32
* Need to use Java's graphical interface knowledge
* Window JFrame
* Panel JPanel
* Display the text message label JLabel
* Text Box JTextField
* Button JButton

Threading thread is also involved

Look first:

But leave a question here? is to remove the duplicate numbers (you can do it first, later I will upload)

below to see the code, the code has comments, do not know the message:

Package Thread.test1;import Java.awt.borderlayout;import Java.awt.event.actionevent;import   Java.awt.event.actionlistener;import javax.swing.*;/** * This program simulates a lottery program that randomly extracts 7 groups of numbers from 1-32 * requires Java graphical interface knowledge * Window JFrame * Panel JPanel * Display text message label JLabel * text Box JTextField * Button JButton * * */public class Goodluck_1 extends JFrame {JPanel pn1=null ; JPanel PN2; JPanel PN3; JTextField Tf=null; JLabel Msg=null; JButton btn1; JButton Btn2;boolean flag=true;//is used to determine whether to continue to export the prize number of the logo. In the constructor, initialize the interface public goodluck_1 () {tf=new JTextField (40);//The parameter means how many characters the text box can be placed pn1=new JPanel ();//component placed on panel pn1.add (TF) ;//The panel is placed on the window, the current Window object is this, placed on the top (north) This.add (PN1, Borderlayout.north);/* Java JFrame object, the silent layout manager is "Boundary layout" The class name is BorderLayout * * */msg=new JLabel ("Welcome to the Good Luck lottery program! ");p n2=new JPanel ();p n2.add (msg);//panel placed on the form This.add (PN2, borderlayout.center);//Bottom button section btn1=new JButton (" start ");// Add event Btn1.addactionlistener to Start button (new ActionListener () {@Overridepublic void actionperformed (ActionEvent e) {//TODO Auto-generated Method stub//gives the prize mark assignment/*flag=true;choujiaNg (); *//* * Must use multithreading technology, restart a new thread, go to assign flag * and then call Choujiang (), can be a program recovery response. * */class ThreadStart extends Thread {@Overridepublic void Run () {//TODO auto-generated method stub//here to call the lottery methods flag=true; Choujiang ();}} You must instantiate the above thread inner class, and then start new ThreadStart (). Start ();}); Btn2=new JButton ("Stop");//Add Event Listener to stop button Btn2.addactionlistener (new ActionListener () {@Overridepublic void actionperformed (ActionEvent e) {//TODO auto-generated method stub//must start a new stop thread in order to terminate the Infinite loop class Threadstop extends thread{@Overridepublic void Run () {//TODO auto-generated method stubflag=false;}} Start the above internal class thread new Threadstop (). Start ();}); Pn3=new JPanel ();p n3.add (BTN1);p n3.add (BTN2); This.add (PN3, Borderlayout.south);//Set the properties of the window This.settitle (" Good luck Winning program 1.0 "); This.setsize, this.setlocation (+);//jframe default Close button, just hide window, You need to override the design shutdown feature this.setdefaultcloseoperation (jframe.exit_on_close); this.setvisible (true);//choujiang ();} For a complex task, the first thing to think about is the encapsulation method public void Choujiang () {/* * * Due to the Start button startup, when it stops, is indeterminate, so the number of cycles is not determined * need to use while loop, and start is infinite loop * */string text= "";  The function is to display the number sequence in the text box while (flag) {/** * Each loop is from 1-32, randomly extract 7 groups of numbers, and spell the string * displayed in the text box * */text= ""; Each time the number is displayed, the newly drawn number for (int i=0;i<7;i++) {int m= (int) (Math.random () *32+1) is displayed again, and if (m<10) {text=text+ "0" +M;} else {text=text+ "" +M;}} It takes a little time to pause, otherwise the loop is too fast, there will be a problem try {thread.sleep),} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();} Displayed in the text box Tf.settext (text);}} public static void Main (string[] args) {//In ongoing development, the less code in the main method, the better. New Goodluck_1 ();}}

There is a need for yourself that past try, play a play!

Java simulates a lottery program