在线随机生成java代码块 java随机数生成器代码

/**

设计一个随机数生成器，可以产生给定平均概率的随机证书序列。

即输入一个概率比如：0.9

然后输入要求的概率样本个数比如：1000

输出一个接近所输入的0.9的概率数（要求样本数越大越接近输入的概率）

*/
import java.util.Date;
import java.util.Scanner;public class Random {
    private int seed;
    private int multiplier = 2743;
    private  int addOn = 5923;
    public Random(boolean pseudo){
        if(pseudo){
            this.seed = 1;
        }else{
            seed = (int)(new Date().getTime()%Integer.MAX_VALUE);
        }
    }
    public double randomReal(){
        double max = Integer.MAX_VALUE + 1.0;
        double temp = reseed();
        if(temp < 0) {
            temp = temp + max;
        }        return temp/max;
    }
    public int randomInteger(int low, int high){
        if(low>high){
            return randomInteger(high,low);
        }else{
            return ((int)((high-low) * randomReal())) + low;
        }
    }
    public int poisson(double mean){
        double limit = Math.exp(mean * -1);
        double product = randomReal();
        int count = 0;
        while(product > limit){
            count ++;
            product = product * randomReal();
        }        return count;
    }    private int reseed(){
        this.seed = seed*multiplier+addOn;
        return  this.seed;
    }
}class MainApplication{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入概率平均值:");
        double mean  = scanner.nextDouble();
        System.out.println("请输入产生随机整数的个数:");
        int count = scanner.nextInt();        Random random = new Random(false);
        int sum =0;
        System.out.println("产生随机整数序列");
        for(int i=0; i<count; i++){
            int num = random.poisson(mean);
            sum += num;
            System.out.print(num + " ");            if((i+1)%40 == 0){
                System.out.println();
            }
        }        System.out.println();
        System.out.println("随机整数序列平均值是:" + sum*1.0/count);
    }
}

//测试两组数据

//第一组：

//第二组：