java随机抽题算法代码 java实现抽奖概率算法

请问用java从1-33个整数中随机抽取6个数字 且不重复 1-16随机抽取一个数，给小球？

完整代码为：

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public class Main {

public static void main(String[] args) {

int index = 1;

int[] redBalls = new int[6];

Random random = new Random();

boolean getMoreRed = true;

boolean getAgain;

System.out.println("开始抽取红球！");

while (getMoreRed) {

getAgain = false;

int red = random.nextInt(36) + 1;

System.out.print("本次抽取到的红球为：[" + red + "]！");

for (int i = 0; i index; i++) {

if (redBalls[i] == red) {

System.out.print("重复抽取，将重新抽取红球");

getAgain = true;

break;

}

}

System.out.println("");

if (getAgain){

continue;

}

redBalls[index - 1] = red;

index++;

getMoreRed = index 7;

}

System.out.println("抽取到的红球为：");

Arrays.sort(redBalls);

for (int redBall : redBalls) {

System.out.print(redBall + " ");

}

System.out.println("\n\n开始抽取蓝球！");

System.out.println("本次抽取到的蓝球为：[" + (random.nextInt(16) + 1) + "]！");

}

}

运行结果：

普通抽取：

重复时抽取：

用加减乘除算法随机出题java源代码

import java.io.*;

import java.sql.*;

import javax.servlet.*;

import javax.servlet.http.*;

import oracle.jdbc.driver.OracleDriver;

public class GenPaperServlet extends HttpServlet

{

Connection conn;

Statement stmt;

ResultSet rs;

int total_question_num;

int total_question_in_paper;

int total_paper_num;

String curr_classid;

public GenPaperServlet()

{

conn = null;

stmt = null;

rs = null;

total_question_num = 0;

total_question_in_paper = 0;

total_paper_num = 0;

curr_classid = "";

}

public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)

throws ServletException, IOException

{

httpservletresponse.setContentType("text/html;charset=GBK");

PrintWriter printwriter = httpservletresponse.getWriter();

printwriter.println("htmlhead/headbodycenter");

printwriter.println("请以POST方式提交");

printwriter.println("/center/body/html");

printwriter.close();

（java）题库中有20道题，随机抽10道不同的题出来 怎么写代码 在线等啊

import java.util.*;

class Untitled {

public static void main(String[] args) throws Exception {

Integer[] questions = generateQuestions();

for(Integer question : questions) {

System.out.println(question);

}

}

private static Integer[] generateQuestions() {

ListInteger questionNumbers = new ArrayListInteger();

Random rand = new Random();

int questionNumber, i = 0;

while(i  10) {

questionNumber = rand.nextInt(21);

if(!questionNumbers.contains(questionNumber)) {

questionNumbers.add(questionNumber);

i ++;

}

}

return questionNumbers.toArray(new Integer[10]);

}

}

java随机抽号程序

现在的可以了，你试下

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

public class RandomTest extends JFrame {

private static final long serialVersionUID = 6764423443555437772L;

boolean isStop = false;

private JLabel jl = new JLabel();

private JTextField jt = new JTextField();

private JButton start = new JButton("start");

private JButton stop = new JButton("stop");

private JPanel jp = new JPanel();

public RandomTest() {

this.jl.setHorizontalAlignment(SwingConstants.CENTER);

this.jl.setText("60"); // 设置随机数范围1到60

this.jl.setForeground(Color.red); // 设置字体颜色

this.jl.setFont(new Font("Dialog", 1, 24)); // 设置字体样式、大小

GridLayout layout = new GridLayout(1, 2);

this.add(jl, BorderLayout.NORTH);

this.add(jt, BorderLayout.CENTER);

this.jp.add(start, layout);

this.jp.add(stop, layout);

this.add(jp, BorderLayout.SOUTH);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 关闭窗口

start.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

isStop = false;

JTextThread jtt = new JTextThread(jt);

jtt.start();

}

});

stop.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

isStop = true;

}

});

}

public static void main(String[] args) {

RandomTest rt = new RandomTest();

rt.setSize(400, 300);

rt.setLocationRelativeTo(null); // 设置窗口初始位置，屏幕中央

rt.setVisible(true);

}

class JTextThread extends Thread {

private JTextField jt;

public JTextThread(JTextField jt) {

this.jt = jt;

}

@Override

public void run() {

while (!isStop) {

try {

Thread.sleep(100);

int random = (int) (Math.random() * 60 + 1);

jt.setText(String.valueOf(random));

jt.setForeground(Color.blue); // 设置字体颜色

jt.setFont(new Font("Dialog", 1, 48)); // 设置字体样式、大小

jt.setHorizontalAlignment(SwingConstants.CENTER);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

}

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