Java——生成随机数，并根据每个值对其进行分类

Question

我是Java新手。所以，我想做的是，创建一个程序，生成25个随机int值，并为每个值使用if-else语句将其分类为大于、小于或等于第二个随机生成的值。我想使用数组来访问每个元素，但我不确定除了使用数组之外我还能做什么。

import java.util.Random;

public class main {

    public static void main(String[] args){
        Ranhtml" target="_blank">dom rand = new Random();
        int[] randNumber = new int[25];

        for (int i = 0; i<25; i++){
            randNumber[i] = rand.nextInt(100);
        }

        if (randNumber[i]<randNumber[i+1]){
            System.out.println("Number " + randNumber[i] + "smaller than " + randNumber[i+1]);
        }
        else if(randNumber[i]>randNumber[i+1]){
            System.out.println("Number" + randNumber[i] + "greater than" + randNumber[i+1]);
        }else if(randNumber[i] == randNumber[i+1]){
            System.out.println("Number " + randNumber[i] + "equal to " + randNumber[i+1]);
        }else{
            System.out.println("Wrong!");
        }

    }
}

我知道if-else部分是完全错误的，但我不知道如何访问数组并比较它们。当我编译时，它会创建25个随机数，但打印部分总是显示

大于0的数字x

因此，[我1 ]认为总是零。

非常感谢

使现代化

多亏了Dawood ibn Kareem的回答，我最终创建了2个for循环。

for (int i = 0; i<25; i++){
            randNumber[i] = rand.nextInt(100);
}

for(int i = 0; i<25; i++) {
            if (randNumber[i] < randNumber[i + 1]) {
                System.out.println("Number " + randNumber[i] + " smaller than " + randNumber[i + 1]);
            } else if (randNumber[i] > randNumber[i + 1]) {
                System.out.println("Number " + randNumber[i] + " greater than " + randNumber[i + 1]);
            } else if (randNumber[i] == randNumber[i + 1]) {
                System.out.println("Number " + randNumber[i] + " equal to " + randNumber[i + 1]);
            } else {
                System.out.println("Wrong!");
            }
 }

输出看起来像这样；

Number 47 equal to 47
Number 47 smaller than 90
Number 90 greater than 84
Number 84 greater than 50
Number 50 greater than 29
Number 29 smaller than 42
Number 42 smaller than 51
Number 51 smaller than 92
Number 92 greater than 8
Number 8 smaller than 31
Number 31 smaller than 87
Number 87 greater than 10
Number 10 smaller than 80
Number 80 greater than 56
Number 56 greater than 49
Number 49 smaller than 63
Number 63 greater than 33
Number 33 smaller than 64
Number 64 greater than 25
Number 25 smaller than 87
Number 87 greater than 16
Number 16 smaller than 65
Number 65 greater than 15
Number 15 smaller than 44

但我有一个错误说；

线程“main”java中出现异常。lang.ArrayIndexOutOfBoundsException:索引25超出主节点长度25的界限。main（main.java:15）

Answer 1

我想使用数组来访问每个元素，但我不确定除了使用数组之外我还能做什么。

嗯，如果你的要求是在没有数组的情况下完成它——你可以只生成这个数字，然后立即检查这个数字是等于还是大于或小于前一个数字：

int n = 25;
int previous = rand.nextInt(100);
for (int i = 0; i < n - 1; i++) {
    int current = rand.nextInt(100);
    
    String comparison;
    if (previous < current) {
        comparison = "smaller than";
    }
    else if (previous > current) {
        comparison = "greater than";
    }
    else {
        comparison = "equal to";
    }
    System.out.println(String.format("Number %s %s %s", previous, comparison, current));

    previous = current;
}

Answer 2

运行for循环24次而不是25次，因为如果i=24，则索引randNum[24]处没有数组值（数组索引从0开始）（当在if语句中执行i 1时）。

java prettyprint-override">for (int i = 0; i < 24; i++)
{
  //your if-else blocks
}