使用java语言编写一个抽奖系统

package ch07;

import javaxswing;

public class Test2 {

 public static void main(String[] args) {

  String output="";

  output+="恭喜第"+(1+(int)(Mathrandom()100))+"号中了一等奖";

  output+="\n恭喜第"+(1+(int)(Mathrandom()100))+"号"+(int)(1+(Mathrandom()100))+"号"+"中了二等奖";

   for(int i=0;i<3;i++){

    output+="\n恭喜第"+(1+(int)(Mathrandom()100))+"号中了三等奖";   

          }

    JOptionPaneshowMessageDialog(null, output);

 }

}

程序运行结果截图

中奖的人是随机的！

帮你做了一个，不知是否满意呢？

import javaappletApplet;

import javaawtButton;

import javaawtColor;

import javaawtGraphics;

import javaawtTextField;

import javaawteventActionEvent;

import javautilRandom;

import javautilVector;

public class Lottery extends Applet {

private static final long serialVersionUID = 1L;

int w,h;

Button ok,out,setup;

String[] msg;

TextField[] gaiLv;

TextField[] jiangPin;

int mx,ml;

int maxNum;

Random ran;

Vector<Integer> fist;

Vector<Integer> sec;

Vector<Integer> third;

Vector<Integer> lucky;

boolean lot=false;

boolean iserr=false;

boolean issetup=false;

String mesg="输入错误";

String priseMsg="继续努力！";

public void init(){

w=400;

h=220;

mx=20;

ml=40;

ran=new Random();

thissetSize(w, h);

thissetLayout(null);

ok=new Button("抽奖");

out=new Button("退出");

setup=new Button("确认设置");

msg=new String[4];

msg[0]="一等奖";

msg[1]="二等奖";

msg[2]="三等奖";

msg[3]="幸运奖";

gaiLv=new TextField[4];

jiangPin=new TextField[4];

for(int i=0;i<4;i++){

gaiLv[i]=new TextField("00"+(i+1));

thisadd(gaiLv[i]);

gaiLv[i]setBounds(mx+ml, 75+i26, 60, 18);

jiangPin[i]=new TextField();

thisadd(jiangPin[i]);

jiangPin[i]setBounds(mx+ml3, 75+i26, 80, 18);

}

thisadd(ok);

oksetBounds(260, 180, 60, 28);

okaddActionListener(new LotButtonAction(this));

thisadd(out);

outsetBounds(330, 180, 60, 28);

outaddActionListener(new LotButtonAction(this));

thisadd(setup);

setupsetBounds(110, 180, 80, 24);

setupaddActionListener(new LotButtonAction(this));

}

public void paint(Graphics g){

gsetColor(Colorwhite);

gfillRect(0, 0, thisgetWidth(), thisgetHeight());

gsetColor(new Color(230,255,230));

gfillRect(0, 0, w, 30);

gsetColor(ColorBLUE);

gdrawString("JAVA抽奖系统", 130, 20);

gsetColor(ColorORANGE);

gdrawRect(10, 40, 230, 170);

gsetColor(ColorBLACK);

gdrawString("设置", mx, 60);

gdrawString("概率", mx+ml, 60);

gdrawString("奖品", mx+ml3, 60);

for(int i=0;i<msglength;i++){

gsetColor(new Color(255-(i30),45,89));

gdrawString(msg[i], 20, 90+i26);

}

if(lot==true){

gsetColor(new Color(rannextInt(255),rannextInt(255),rannextInt(255)));

if(priseMsglength()<=7){

gdrawString(priseMsg, 260, 100);

}else{

gdrawString(priseMsgsubstring(0, 5), 260, 100);

gdrawString(priseMsgsubstring(5), 260, 120);

}

}

if(iserr==true){

gdrawString(mesg, 260, 100);

}

}

public void getLucky(){

float firu=1;

float secu=1;

float thiu=1;

float fouu=1;

float minu=1;

if(gaiLv[0]getText()trim()length()>1){

firu=FloatparseFloat(gaiLv[0]getText());

if(firu<=0||firu>=1){

iserr=true;

return;

}

if(firu<minu){

minu=firu;

}

}

if(gaiLv[1]getText()trim()length()>1){

secu=FloatparseFloat(gaiLv[1]getText());

if(secu<=0||secu>=1){

iserr=true;

return;

}

if(secu<minu){

minu=secu;

}

}

if(gaiLv[2]getText()trim()length()>1){

thiu=FloatparseFloat(gaiLv[2]getText());

if(thiu<=0||thiu>=1){

iserr=true;

return;

}

if(thiu<minu){

minu=thiu;

}

}

if(gaiLv[3]getText()trim()length()>1){

fouu=FloatparseFloat(gaiLv[3]getText());

if(fouu<=0||fouu>=1){

iserr=true;

return;

}

if(fouu<minu){

minu=fouu;

}

}

if(minu>=1||minu<=0){

iserr=true;

return;

}

float aNum=1/minu;

maxNum=(int)aNum;

int count=(int)(firu/minu);

if(firu!=1){

fist=getLotteryVec(maxNum,count);

}else{

fistremoveAllElements();

}

count=(int)(secu/minu);

if(secu!=1){

sec=getLotteryVec(maxNum,count);

}else{

secremoveAllElements();

}

count=(int)(thiu/minu);

if(thiu!=1){

third=getLotteryVec(maxNum,count);

}else{

thirdremoveAllElements();

}

count=(int)(fouu/minu);

if(fouu!=1){

lucky=getLotteryVec(maxNum,count);

}else{

luckyremoveAllElements();

}

issetup=true;

iserr=false;

}

protected Vector<Integer> getLotteryVec(int maxNum,int num){

Vector<Integer> result=new Vector<Integer>();

for(int i=0;i<num;i++){

resultadd(rannextInt(maxNum));

}

return result;

}

protected int getaNum(){

return rannextInt(maxNum);

}

public int isLucky(int pNum){

for(int i=0;i<fistsize();i++){

if(fistget(i)==pNum){

return 1;

}

}

for(int i=0;i<secsize();i++){

if(secget(i)==pNum){

return 2;

}

}

for(int i=0;i<thirdsize();i++){

if(thirdget(i)==pNum){

return 3;

}

}

for(int i=0;i<luckysize();i++){

if(luckyget(i)==pNum){

return 4;

}

}

return -1;

}

public void ButtonActionPerformed(ActionEvent e){

String acName=egetActionCommand();

if(acNameequals("抽奖")){

if(issetup==false){

priseMsg="请先设置参数！";

lot=true;

repaint();

lot=false;

return;

}

lot=true;

priseMsg=getResult(getaNum());

repaint();

// lot=false;

}else if(acNameequals("退出")){

thissetVisible(false);

thisstop();

thisdestroy();

Systemexit(0);

}else if(acNameequals("确认设置")){

lot=false;

getLucky();

repaint();

}

}

public String getResult(int num){

int resu=isLucky(num);

String result="";

switch(resu){

case -1:

result="继续努力！";

break;

case 1:

result="恭喜你！一等奖!\n获得"+jiangPin[0]getText();

break;

case 2:

result="恭喜你！二等奖!\n获得"+jiangPin[1]getText();

break;

case 3:

result="恭喜你！三等奖!\n获得"+jiangPin[2]getText();

break;

case 4:

result="恭喜你！幸运奖!\n获得"+jiangPin[3]getText();

break;

default:

result="继续努力！";

}

return result+num;

}

}

class LotButtonAction implements javaawteventActionListener{

Lottery su;

public LotButtonAction(Lottery bun){

thissu=bun;

}

@Override

public void actionPerformed(ActionEvent e) {

suButtonActionPerformed(e);

}

}

import javaawtGridLayout;

import javaawteventActionEvent;

import javaawteventActionListener;

import javanetURL;

import javaxswingBorderFactory;

import javaxswingImageIcon;

import javaxswingJButton;

import javaxswingJFrame;

import javaxswingJLabel;

import javaxswingJPanel;

import javaxswingUIManager;

import javautil;

import javaioFileReader;

import javaioFile;

// This example demonstrates the use of JButton, JTextField

// and JLabel

public class LunarPhases implements ActionListener {

final static int NUM_IMAGES = 1000;

final static int START_INDEX = 0;

int REAL_NUM_IMAGES = 0;

ImageIcon[] images = new ImageIcon[NUM_IMAGES];

String[] imageNames = new String[NUM_IMAGES];

JPanel mainPanel, selectPanel, displayPanel, resultPanel;

JButton phaseChoice = null;

JLabel phaseIconLabel = null, phaseResult = null;

// Constructor

public LunarPhases() {

// Create the phase selection and display panels

selectPanel = new JPanel();

displayPanel = new JPanel();

resultPanel = new JPanel();

// Add various widgets to the sub panels

addWidgets();

// Create the main panel to contain the two sub panels

mainPanel = new JPanel();

mainPanelsetLayout(new GridLayout(1, 3, 5, 5));

mainPanelsetBorder(BorderFactorycreateEmptyBorder(5, 5, 5, 5));

// Add the select and display panels to the main panel

mainPaneladd(selectPanel);

mainPaneladd(displayPanel);

mainPaneladd(resultPanel);

}

// Create and the widgets to select and display the phases of the moon

private void addWidgets() {

// Get the images and put them into an array of ImageIcon

File dir = new File("C:\\Program Files\\JavaSoft\\JDK131\\bin\\images");

File[] files = dirlistFiles();

String imageName = null;

String temp = null;

int j = 0;

for (int i = 0; i < fileslength; i++) {

if (!files[i]isDirectory()) {

imageName = "images/" + files[i]getName();

}

temp = imageNamesubstring(imageNamelastIndexOf("") + 1, imageNamelength());

if(!tempequals("gif"))

{

continue;

}

URL iconURL = ClassLoadergetSystemResource(imageName);

ImageIcon icon = new ImageIcon(iconURL);

images[j] = icon;

imageNames[j] = imageNamesubstring(7,imageNamelastIndexOf(""));

j++;

}

REAL_NUM_IMAGES = j;

// Create label for displaying moon phase images and put a border around

// it

phaseIconLabel = new JLabel();

phaseIconLabelsetHorizontalAlignment(JLabelCENTER);

phaseIconLabelsetVerticalAlignment(JLabelCENTER);

phaseIconLabelsetVerticalTextPosition(JLabelCENTER);

phaseIconLabelsetHorizontalTextPosition(JLabelCENTER);

phaseIconLabelsetBorder(BorderFactorycreateCompoundBorder(

BorderFactorycreateLoweredBevelBorder(), BorderFactory

createEmptyBorder(5, 5, 5, 5)));

phaseIconLabelsetBorder(BorderFactorycreateCompoundBorder(

BorderFactorycreateEmptyBorder(0, 0, 10, 0), phaseIconLabel

getBorder()));

phaseResult = new JLabel();

// Create combo box with lunar phase choices

phaseChoice = new JButton("开始/停止");

// Display the first image

phaseIconLabelsetIcon(images[START_INDEX]);

phaseIconLabelsetText("");

// Add border around the select panel

selectPanelsetBorder(BorderFactorycreateCompoundBorder(BorderFactory

createTitledBorder("Select Phase"), BorderFactory

createEmptyBorder(5, 5, 5, 5)));

resultPanelsetBorder(BorderFactorycreateCompoundBorder(BorderFactory

createTitledBorder("Result Phase"), BorderFactory

createEmptyBorder(5, 5, 5, 5)));

// Add border around the display panel

displayPanelsetBorder(BorderFactorycreateCompoundBorder(BorderFactory

createTitledBorder("Display Phase"), BorderFactory

createEmptyBorder(5, 5, 5, 5)));

// Add moon phases combo box to select panel and image label to

// displayPanel

selectPanelsetLayout(new GridLayout(3,3));//这里原来是selectPaneladd(phaseChoice);

// displayPaneladd(phaseIconLabel);

// resultPaneladd(phaseResult);

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

selectPaneladd(phaseChoice);

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

selectPaneladd(new JLabel());

resultPanelsetLayout(new BorderLayout());

displayPaneladd(phaseIconLabel);

resultPaneladd(phaseResult);

// Listen to events from combo box

phaseChoiceaddActionListener(this);

}

boolean run = false;

// Implementation of ActionListener interface

public void actionPerformed(ActionEvent event) {

if(run){

run = false;

}

else{

run = true;

new Thread(){

public void run(){

while(run){

int a =(int)( Mathrandom()REAL_NUM_IMAGES);

phaseIconLabelsetIcon(images[a]);

phaseResultsetText(imageNames[a]);

try{

Threadsleep(100);

}

catch(Exception e){}

}

}

}start();

}

}

// main method

public static void main(String[] args) {

// create a new instance of LunarPhases

LunarPhases phases = new LunarPhases();

// Create a frame and container for the panels

JFrame lunarPhasesFrame = new JFrame("Lunar Phases");

// Set the look and feel

try {

UIManagersetLookAndFeel(UIManager

getCrossPlatformLookAndFeelClassName());

} catch (Exception e) {

}

lunarPhasesFramesetContentPane(phasesmainPanel);

// Exit when the window is closed

lunarPhasesFramesetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

// Show the converter

lunarPhasesFramepack();

lunarPhasesFramesetVisible(true);

}

}

程序循环应该写在开始按钮的监听里,当按下开始按钮后,程序开始循环,当按停止按钮时,循环停止 你可以用while循环, 条件是一个boolean型的值,当按开始值为true,当按停止值为false

你是要JAVA可视化的 还是控制台的啊？

控制台的话 你可以用循环来取中奖号，将其存入list或set里（最好是set，因为set本来就不会重复）。如果用list存就另外写一个循环方法，来挨个判定该元素是不是已经在list中存在了，如果存在，就让选号的再加选一次，如果不重复，就放到list里去。。。。OK

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