哈哈哈哈哈哈

package ClassroomExercises;

import java.io.File;

public class Practice {

    public static void main(String[] args) {



        int[][] arr = {{1,2,3},{4,5},{6}};

        for(int x=0; x<arr.length; x++) {
            for (int y = 0; y < arr[x].length; y++) {
                System.out.print(arr[x][y] + " ");
            }
            System.out.println();
        }

    }
}