宾果板随机数问题，java [英] Bingo board random number issues, java

问题描述

所以第一个 2列B和我打印随机数很好，Everything打印出相同的东西。我如何解决这个问题



我的尝试：



< pre lang =java> package 赋值;
import java.util.Random;

public class Bingo {

public static void main（ String [] args）{
Random rand = new Random（）;
int bLow = 0 ，iLow = 16 ，nLow = 44 ，gLow = 59 ，oLow = 74 ;
int bLimit = 15 ，iLimit = 30 ，nLimit = 45 ，gLimit = 60 ，oLimit = 75 ;
int rB = rand.nextInt（bLimit-bLow）+ bLow，rI = rand.nextInt（iLimit-iLow）+ iLow，rN = rand.nextInt （nLimit-nLow）+ nLow，rG = rand.nextInt（gLimit-gLow）+ gLow，rO = rand.nextInt（oLimit-oLow）+ oLow;
int sB = rand.nextInt（bLimit-bLow）+ bLow，sI = rand.nextInt（iLimit-iLow）+ iLow，sN = rand.nextInt （nLimit-nLow）+ nLow，sG = rand.nextInt（gLimit-gLow）+ gLow，sO = rand.nextInt（oLimit-oLow）+ oLow;
int tB = rand.nextInt（bLimit-bLow）+ bLow，tI = rand.nextInt（iLimit-iLow）+ iLow，tN = rand.nextInt （nLimit-nLow）+ nLow，tG = rand.nextInt（gLimit-gLow）+ gLow，tO = rand.nextInt（oLimit-oLow）+ oLow;
int uB = rand.nextInt（bLimit-bLow）+ bLow，uI = rand.nextInt（iLimit-iLow）+ iLow，uN = rand.nextInt （nLimit-nLow）+ nLow，uG = rand.nextInt（gLimit-gLow）+ gLow，uO = rand.nextInt（oLimit-oLow）+ oLow;
int vB = rand.nextInt（bLimit-bLow）+ bLow，vI = rand.nextInt（iLimit-iLow）+ iLow，vN = rand.nextInt （nLimit-nLow）+ nLow，vG = rand.nextInt（gLimit-gLow）+ gLow，vO = rand.nextInt（oLimit-oLow）+ oLow;
System.out.println（ B\t | \tI \ t | \tN \t | \tG\t | \tO）;
System.out.println（rB + \t | \t + rI + \t | \t + rN + \t | \t + rG + \t | \t + rO）;
System.out.println（sB + \t | \t + sI + \t | \t + sN + \t | \t + sG + \t | \t + sO）;
System.out.println（tB + \t | \t + tI + \t | \t + tN + \t | \t + tG + \t | \t + tO）;
System.out.println（uB + \t | \t + uI + \t | \t + uN + \t | \t + uG + \t | \t + uO）;
System.out.println（vB + \t | \t + vI + \t | \t + vN + \t | \t + vG + \t | \t + vO）;

}

}

解决方案

为了获得不同的结果，你有将合理范围传递给 Random.nextInt 方法。



查看（例如）

 rN = rand.nextInt（nLimit-nLow）+ nLow; 

语句。由于 nLimit - nLow = 1 ， nextInt 方法始终返回 0 并且你总是得到 rN = nLow （另见文档 [ ^ ]）。

So the first 2 columns B and I print random numbers fine, Everything after prints the same thing. How do i fix this

What I have tried:

package assignments;
import java.util.Random;

public class Bingo {

	public static void main(String[] args) {
		Random rand = new Random();
		int bLow = 0, iLow = 16, nLow = 44, gLow = 59, oLow = 74;
		int bLimit = 15, iLimit = 30, nLimit = 45, gLimit = 60, oLimit = 75;
		int rB = rand.nextInt(bLimit-bLow) + bLow, rI = rand.nextInt(iLimit-iLow) + iLow, rN = rand.nextInt(nLimit-nLow) + nLow, rG = rand.nextInt(gLimit-gLow) + gLow, rO = rand.nextInt(oLimit-oLow) + oLow;
		int sB = rand.nextInt(bLimit-bLow) + bLow, sI = rand.nextInt(iLimit-iLow) + iLow, sN = rand.nextInt(nLimit-nLow) + nLow, sG = rand.nextInt(gLimit-gLow) + gLow, sO = rand.nextInt(oLimit-oLow) + oLow;
		int tB = rand.nextInt(bLimit-bLow) + bLow, tI = rand.nextInt(iLimit-iLow) + iLow, tN = rand.nextInt(nLimit-nLow) + nLow, tG = rand.nextInt(gLimit-gLow) + gLow, tO = rand.nextInt(oLimit-oLow) + oLow;
		int uB = rand.nextInt(bLimit-bLow) + bLow, uI = rand.nextInt(iLimit-iLow) + iLow, uN = rand.nextInt(nLimit-nLow) + nLow, uG = rand.nextInt(gLimit-gLow) + gLow, uO = rand.nextInt(oLimit-oLow) + oLow;
		int vB = rand.nextInt(bLimit-bLow) + bLow, vI = rand.nextInt(iLimit-iLow) + iLow, vN = rand.nextInt(nLimit-nLow) + nLow, vG = rand.nextInt(gLimit-gLow) + gLow, vO = rand.nextInt(oLimit-oLow) + oLow;
		System.out.println("B\t|\tI\t|\tN\t|\tG\t|\tO");
		System.out.println(rB + "\t|\t" + rI + "\t|\t" + rN + "\t|\t" + rG + "\t|\t" + rO);
		System.out.println(sB + "\t|\t" + sI + "\t|\t" + sN + "\t|\t" + sG + "\t|\t" + sO);
		System.out.println(tB + "\t|\t" + tI + "\t|\t" + tN + "\t|\t" + tG + "\t|\t" + tO);
		System.out.println(uB + "\t|\t" + uI + "\t|\t" + uN + "\t|\t" + uG + "\t|\t" + uO);
		System.out.println(vB + "\t|\t" + vI + "\t|\t" + vN + "\t|\t" + vG + "\t|\t" + vO);

	}

}

解决方案

In order to obtain different results you have to pass sensible ranges to the Random.nextInt method.

Look at (for instance)

rN = rand.nextInt(nLimit-nLow) + nLow;

statement. Since nLimit - nLow = 1, the nextInt method always returns 0 and you always get rN = nLow (see also the documentation[^]).

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