Program to Implement Number Pattern in Java

class Pattern

{

                public static void main(String args[])

                {

                                int twod[][]=new int[4][];

                                twod[0]=new int[1];

                                twod[1]=new int[2];

                                twod[2]=new int[3];

                                twod[3]=new int[4];

                                int i,j,k=0;

                                for(i=0;i<4;i++)

                                {

                                                for(j=0;j<i+1;j++)

                                                {

                                                                twod[i][j]=k;

                                                                k++;

                                                }

                                }

                                for(i=0;i<4;i++)

                                {

                                                for(j=0;j<i+1;j++)

                                                {

                                                                System.out.print(twod[i][j] + " ");

                                                }

                                                System.out.println();

                                }

                               

                }

}

Output:

0

1 2

3 4 5

6 7 8 9