「java概率抽奖」java随机抽奖程序
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本文目录一览：
java抽奖程序,可设置不同奖品获得概率
import java.awt.EventQueue;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class LuckySelect extends JFrame {
private JPanel contentPane;
private JTextField textFieldA;
private JTextField textFieldB;
private JTextField textFieldC;
private TextField textField;
private JTextField textFieldResult;
private JTextArea textArea;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
LuckySelect frame = new LuckySelect();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public LuckySelect() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 251);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(null);
setContentPane(contentPane);
JLabel lblA = new JLabel("A");
lblA.setBounds(10, 128, 54, 15);
contentPane.add(lblA);
JLabel lblB = new JLabel("B");
lblB.setBounds(124, 128, 54, 15);
contentPane.add(lblB);
JLabel lblC = new JLabel("C");
lblC.setBounds(254, 128, 54, 15);
contentPane.add(lblC);
textFieldA = new JTextField();
textFieldA.setBounds(30, 125, 66, 21);
contentPane.add(textFieldA);
textFieldA.setColumns(10);
textFieldB = new JTextField();
textFieldB.setColumns(10);
textFieldB.setBounds(149, 125, 66, 21);
contentPane.add(textFieldB);
textFieldC = new JTextField();
textFieldC.setColumns(10);
textFieldC.setBounds(264, 125, 66, 21);
contentPane.add(textFieldC);
textField = new TextField();
textField.setBounds(98, 167, 157, 21);
contentPane.add(textField);
textField.setColumns(10);
textFieldResult = new JTextField();
textFieldResult.setBounds(280, 167, 66, 21);
contentPane.add(textFieldResult);
textFieldResult.setColumns(10);
textFieldA.setText("10");
textFieldB.setText("10");
textFieldC.setText("10");
JButton button = new JButton("\u62BD\u5956");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
select();
}
});
button.setBounds(0, 166, 93, 23);
contentPane.add(button);
textArea = new JTextArea();
textArea.setBounds(30, 31, 306, 83);
contentPane.add(textArea);
}
protected void select() {
// TODO Auto-generated method stub
int aNum = Integer.decode(textFieldA.getText());
int bNum = Integer.decode(textFieldB.getText());
int cNum = Integer.decode(textFieldB.getText());
Random r = new Random();
int random = r.nextInt(aNum + bNum + cNum);
if(random = aNum){
textFieldA.setText(Integer.toString(Integer.decode(textFieldA.getText()) - 1));
textArea.append(Integer.toString(random) + "抽中了A\n");
}else if(random = aNum + bNum){
textFieldB.setText(Integer.toString(Integer.decode(textFieldB.getText()) - 1));
textArea.append(Integer.toString(random) + "抽中了B\n");
}else if(random = aNum + bNum + cNum){
textFieldC.setText(Integer.toString(Integer.decode(textFieldC.getText()) - 1));
textArea.append(Integer.toString(random) + "抽中了C\n");
}
}
}
求java算法：根据物品的数量来确定抽奖的概率(当物品数量为0时无论如何都不可能选到)
public class Lottery {
private int m = 1000;//发放奖券的数量
private int n = 2;//奖品的数量
public boolean getLottery(){
boolean isLottery = false;
double d = (double)n/(double)m;//中奖概率
double r = Math.random();//0~1之间的随机数，包括0
if(rd){//如果随机数小于概率 那么中奖
n--;//奖品数量-1
isLottery = true;
}
m--;//奖券数量-1
return isLottery;
}
}
java集五福活动概率技术如何实现
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* 抽奖工具类,概率和可以不等于1
* 概率为百分数去掉百分号的部分，如10%，则为10
* 抽奖操作如下：
* 1.输入抽奖概率集合，【抽奖概率集合为{10.0, 20.0, 30.0}】
* 2.生成连续集合， 【生成的连续集合为{(0.0, 10.0],(10.0, 30.0],(30.0, 60.0]}】
* 3.生成随机数， 【生成方法为 random.nextDouble() * maxElement】
* 4.判断随机数在哪个区间内，返回该区间的index【生成了随机数12.001，则它属于(10.0, 30.0]，返回 index = 1】
*
*/
public class LotteryUtil {
/**
* 定义一个连续集合
* 集合中元素x满足:(minElement,maxElement]
* 数学表达式为：minElement x = maxElement
*
*/
public class ContinuousList {
private double minElement;
private double maxElement;
public ContinuousList(double minElement, double maxElement){
if(minElement maxElement){
throw new IllegalArgumentException("区间不合理，minElement不能大于maxElement！");
}
this.minElement = minElement;
this.maxElement = maxElement;
}
/**
* 判断当前集合是否包含特定元素
* @param element
* @return
*/
public boolean isContainKey(double element){
boolean flag = false;
if(element minElement element = maxElement){
flag = true;
}
return flag;
}
}
private ListContinuousList lotteryList; //概率连续集合
private double maxElement; //这里只需要最大值，最小值默认为0.0
/**
* 构造抽奖集合
* @param list 为奖品的概率
*/
public LotteryUtil(ListDouble list){
lotteryList = new ArrayListContinuousList();
if(list.size() == 0){
throw new IllegalArgumentException("抽奖集合不能为空！");
}
double minElement = 0d;
ContinuousList continuousList = null;
for(Double d : list){
minElement = maxElement;
maxElement = maxElement + d;
continuousList = new ContinuousList(minElement, maxElement);
lotteryList.add(continuousList);
}
}
/**
* 进行抽奖操作
* 返回：奖品的概率list集合中的下标
*/
public int randomColunmIndex(){
int index = -1;
Random r = new Random();
double d = r.nextDouble() * maxElement; //生成0-1间的随机数
if(d == 0d){
d = r.nextDouble() * maxElement; //防止生成0.0
}
int size = lotteryList.size();
for(int i = 0; i size; i++){
ContinuousList cl = lotteryList.get(i);
if(cl.isContainKey(d)){
index = i;
break;
}
}
if(index == -1){
throw new IllegalArgumentException("概率集合设置不合理！");
}
return index;
}
public double getMaxElement() {
return maxElement;
}
public ListContinuousList getLotteryList() {
return lotteryList;
}
public void setLotteryList(ListContinuousList lotteryList) {
this.lotteryList = lotteryList;
}
}
该工具类的基本思想是，将抽奖概率分布到数轴上，如现有三个抽奖概率10、20、30，将三者依次添加到概率集合中，则构造的数轴为：0~10范围内表示概率10，10~30范围内表示概率为20，30~60范围内表示概率为30，数轴上的长度对应着相应的概率。由这种处理方式可知，概率总和并不需要等于1。该工具类的成功与否在于Random.nextDouble()能否等概率地生成0~1之间的任意一个数。
对该抽奖工具进行测试，测试类如下：
[java] view plain copy
package com.lottery;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
class Result{
private int index;
private int sumTime;
private int time;
private double probability;
private double realProbability;
public int getIndex() {
return index;
}
public void setIndex(int index) {
this.index = index;
}
public int getTime() {
return time;
}
public void setTime(int time) {
this.time = time;
}
public int getSumTime() {
return sumTime;
}
public void setSumTime(int sumTime) {
this.sumTime = sumTime;
}
public double getProbability() {
return probability;
}
public double getRealProbability() {
return realProbability;
}
public void setRealProbability(double realProbability) {
this.realProbability = realProbability;
}
public Result(){
}
public Result(int index, int sumTime, int time, double realProbability) {
this.setIndex(index);
this.setTime(time);
this.setSumTime(sumTime);
this.setRealProbability(realProbability);
}
public String toString(){
return "索引值：" + index + "，抽奖总数：" + sumTime + "，抽中次数：" + time + "，概率："
+ realProbability + "，实际概率：" + (double)time/sumTime;
}
}
public class TestLottery {
static final int TIME = 100000;
public static void iteratorMap(MapInteger, Integer map, ListDouble list){
for(EntryInteger, Integer entry : map.entrySet()){
int index = entry.getKey();
int time = entry.getValue();
Result result = new Result(index, TIME, time, list.get(index));
System.out.println(result);
}
}
public static void main(String[] args) {
//构造概率集合
ListDouble list = new ArrayListDouble();
list.add(20d);
list.add(80d);
list.add(50d);
list.add(30d);
LotteryUtil ll = new LotteryUtil(list);
double sumProbability = ll.getMaxElement();
MapInteger, Integer map = new HashMapInteger, Integer();
for(int i = 0; i TIME; i++){
int index = ll.randomColunmIndex();
if(map.containsKey(index)){
map.put(index, map.get(index) + 1);
}else{
map.put(index, 1);
}
}
for(int i = 0; i list.size(); i++){
double probability = list.get(i) / sumProbability;
list.set(i, probability);
}
iteratorMap(map, list);
}
}
运行结果：
由结果可知，抽奖100000时， 得到的实际概率基本与正式概率相当。
以下说明此类调用方式：
[java] view plain copy
public LotteryUtil(ListDouble list)
说明：构造方法，传入参数为一个概率集合
[java] view plain copy
public int randomColunmIndex()
功能：进行抽奖操作，返回List集合的索引下标，此下标对应的概率的奖品即为抽中的奖品
java概率抽奖的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java随机抽奖程序、java概率抽奖的信息别忘了在本站进行查找喔。
发布于：2022-11-22，除非注明，否则均为原创文章，转载请注明出处。