java - 如何将数组排序为列

Question

我需要帮助在 java 中组织数组。下面的代码以直线打印出随机数。但是，我希望代码打印出其中四个数字，然后继续换行。重要的是，我希望代码在第一行打印出四个随机数，然后在第二行打印出另外 4 个随机数，依此类推。

import java.util.Arrays;
import java.util.Random;

public class SelectionSort{ 

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] array = new int[200];

        Random rand = new Random();

        // for acsending order
        for (int i = 0; i < array.length; i++) 



        array[i] = rand.nextInt(1000000) + 1;
        Arrays.sort(array);
        System.out.println(Arrays.toString(array));
        System.out.print("\n");


        // for descending order

        for (int i = array.length - 1; i >= 0; i--)
            System.out.print(array[i] + ", ");
    }

}

Answer 1

您需要为每 4 个数字打印 \n

import java.util.Arrays;
import java.util.Random;

public class SelectionSort { 

    public static void main(String[] args) {
        int[] array = new int[200];

        Random rand = new Random();

        // for acsending order
        for (int i = 0; i < array.length; i++) {

            array[i] = rand.nextInt(1000000) + 1;
        }

        Arrays.sort(array);
        System.out.println(Arrays.toString(array));
        System.out.print("\n");


        // for descending order

        for (int i = array.length - 1; i >= 0; i--) {
            System.out.print(array[i] + ", ");
            if (i % 4 == 0) { 
                // print \n for each 4 numbers.
                System.out.println("\n");
            }
        } 
    }
}