用java怎么实现控制中奖率

可以做到！用 Random 得到随机的数，再根据你的登陆人的身份 控制随机的次数是多少！

例如：

1 - 20 为中奖， 普通就随机出 10000个数。会员的话就随机100个数就好了！

import javaawtGridLayout;

import javaawteventActionEvent;

import javaawteventActionListener;

import javautilArrayList;

import javautilList;

import javaxswingJButton;

import javaxswingJFrame;

import javaxswingJOptionPane;

import javaxswingJPanel;

public class Lottery extends JFrame {

private List<JButton> list = new ArrayList<JButton>();

private final static int SIZE = 9;

private String[] info = new String[SIZE];

private int index;

private boolean flag = true;

public static void main(String[] args) {new Lottery();}

public Lottery() {init();}

private void init() {

thissetTitle("随机抽检");

thissetSize(300, 300);

thisadd(createPanel());

thissetLocationRelativeTo(null);

thissetResizable(false);

thissetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

thissetVisible(true);

}

private JPanel createPanel() {

JPanel panel = new JPanel();

panelsetLayout(new GridLayout(3, 3));

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

listadd(createButton());

}

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

paneladd(listget(i));

}

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

info[i] = "谢谢参与";

}return panel;

}

private JButton createButton() {

JButton button = new JButton();

buttonaddActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (flag) {

index = ((int) (Mathrandom() 100)) % 9;

info[index] = "中奖啦";

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

listget(i)setText(info[i]);

}

if(((JButton)egetSource())getText()equals("中奖啦")){

JOptionPaneshowMessageDialog(null, "恭喜您，中奖啦!");

}else{JOptionPaneshowMessageDialog(null, "很遗憾，您没有中奖!");}

flag = false;

}else{

info[index] = "谢谢参与";

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

listget(i)setText("");

}

flag = true;

}

}

});

return button;

}

}

帮你写了，你运行看看。

我写给你，如果是本专业，以后要多多学习。JDK 16

import javaawtGridLayout;

import javaawteventMouseEvent;

import javaawteventMouseListener;

import javautilIterator;

import javautilRandom;

import javautilSet;

import javautilTreeSet;

import javaxswingJButton;

import javaxswingJFrame;

import javaxswingJTextField;

public class LuckyDrawn {

private JFrame f = new JFrame("Lucky Drawn");

private JButton btn = new JButton("Drawn");

private JTextField result = new JTextField("Result");

private static final int MIN = 1;

private static final int MAX = 30;

private static final int RESULT_COUNT = 7;

public LuckyDrawn(){

fadd(btn);

fadd(result);

resultsetEditable(false);

btnaddMouseListener(new MouseListener(){

public void mouseClicked(MouseEvent e) {

Random rand = new Random();

Set<Integer> set = new TreeSet<Integer>();

while(setsize() < RESULT_COUNT){

setadd(new Integer(randnextInt(MAX)+ 1));

}

StringBuffer sb = new StringBuffer("Lucky numbers are: ");

for (Iterator iter = setiterator(); iterhasNext();) {

sbappend(((Integer) iternext())intValue())append(", ");

}

resultsetText(sbsubstring(0, sblength() - 2)toString());

fpack();

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

});

fsetLayout(new GridLayout(2, 1));

fsetVisible(true);

fsetLocation(500, 200);

fpack();

fvalidate();

fsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

}

public static void main(String[] args) {

new LuckyDrawn();

}

}

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！

import javautilScanner;

public class Choujiang {

public static void main(String[] args) {

Scanner sc = new Scanner(Systemin);//定义Scanner类1234

Systemoutprintln("请输入四位卡号:");//输入提示语

int cardNo = scnextInt();//接受输入数据

int gewei = cardNo%10;//分解个位

int shiwei = cardNo/10%10;//分解十位

int baiwei = cardNo/100%10;//分解百位

int qianwei = cardNo/1000;//分解千位

int sum = gewei+shiwei+baiwei+qianwei;

Systemoutprintln("会员卡号四位之和是："+sum);

if(sum>20){//判断各位数和是否大于20

Systemoutprintln("恭喜，你是幸运客户！");

}else{

Systemoutprintln("谢谢惠顾！");

}

}

}

用一个Int[]数组记录随机到的数字，

插代码：

int[] count=new i[6];//用于接收生成的随机数

for(int i=0;i<ilength;i++)

{

Random rand = new Random(); int c = randnextInt(); //int范围类的随机数 c = randnextInt(30); //生成0-30以内的随机数 c = (int)(Mathrandom() 30); //0-30以内的随机数 count[i]=c;}

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