JAVA HW

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class integer
{
    public integer(int value) {
        this.value = value;
    }
    public int value;
}
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        int lim = 9;
        integer[][] a = new integer[lim][lim];

        for (int i = 0; i < lim; i++) {
            for (int j = 0; j < lim; j++) {
                if (j <= i) a[i][j] = new integer(j + 1);
                else a[i][j] = null;
            }
        }

        for (int i = 0; i < lim; i++) {
            for (int j = 0; j < lim; j++)
                if (j <= i) System.out.print(a[i][j].value + " ");
                else System.out.print(0 + " ");
            System.out.print('\n');
        }
    }
}