从1-300生成30个随机数的数组返回全0而不是其他数字

Question

I have a problem where I'm trying to fill an array with 30 random integers from the range 1-300 with just a main method and one more method called LOAD(). For some reason my code below generates an array with my test statement System.out.println("Here are 30 random numbers: " + Arrays.toString(randomThirty)); but it's filled with only 0s and no other numbers in all fields.

import java.util.*;

public class randArray
{

public static void main(String args[])
{
     //main method which creates an array to store 30 integers

    int[] randomThirty = new int[30]; //declare and set the array randomThirty to have 30 elements as int type

    System.out.println("Here are 30 random numbers: " + Arrays.toString(randomThirty));

    LOAD(randomThirty); // the job of this method is to populate this array with 30 integers in the range of 1 through 300.

}

public static void LOAD(int[] randomThirty)
{
    // looping through to assign random values from 1 - 300
    for (int i = 0; i < randomThirty.length; i++) {
        randomThirty[i] = (int)(Math.random() * 301); 
}
}

}

Answer 1

The reason is that you print out the array first, and populate it second.

In other words, LOAD() doesn't get called until after you've printed out the array.

Answer 2

您正在调用方法之前进行打印....更改调用顺序，它将起作用