Java:随机数对于一切都是一样的

Question

import java.util.Random;

class Moo {

    public static void main(String[] args) {
        Random rand = new Random();

        System.out.println("Index\tValue");
        int randnumb = 1 + rand.nextInt(11);
        int array[] = new int[5];

        array[0] = randnumb;
        array[1] = randnumb;
        array[2] = randnumb;
        array[3] = randnumb;
        array[4] = randnumb;

        for (int counter=0; counter < array.length; counter++)
            System.out.println(counter + "\t" + array[counter]);
    }

}

问题:每个元素都有相同的值,但我希望每个元素都有随机和不同的值.

Answer 1

多数民众赞成因为你已经分配了相同的价值

array[0]=randnumb;
array[1]=randnumb;
array[2]=randnumb;
array[3]=randnumb;
array[4]=randnumb;

你需要这样做

array[0]=1+rand.nextInt(11);
array[1]=1+rand.nextInt(11);
array[2]=1+rand.nextInt(11);
array[3]=1+rand.nextInt(11);
array[4]=1+rand.nextInt(11);

或者你可以用更好的方式做到这一点

Random randomNum = new Random();
int[] arr = new int[5];

/*Iterate through the loop for array length and populate
  and assign random values for each of array element*/

for(int i = 0; i < arr.length; i++){
    arr[i] = randomNum.nextInt(11);
}

并且您可以使用访问这些值

for (int i : arr) {
     // do whatever you want with your values here.I'll just print them
    System.out.println(i);
}