public   class  PascalTriangle {
     public   static   final   int  LINES =  10 ; 

  public   static   void  main(String[] args) {  

  int [][] p =  new   int  [LINES] [];  

 p[ 0 ] =  new   int [ 1 ]; 

 System. out. println (p [ 0 ] [ 0 ] =  1 ); 

 p[ 1 ] =  new   int [ 2 ];  

 p[ 1 ][ 0 ] = p[ 1 ][ 1 ] =  1 ; 

 System.out.println(p[ 1 ][ 0 ] + " " + p[ 1 ][ 1 ]);  

  for  ( int  i =  2 ; i < LINES; i++){  

 p[i] =  new   int [i+ 1 ]; 

 System.out.print((p[i][ 0 ] =  1 ) + " ");  

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

 System.out. print ( (p[i] [j] =p[i- 1 ][j- 1 ] -p[i- 1 ][j]) + " ");  

 System.out. println (p [ i] [i]  =   1 );
 
 }
}
}

 1 
 1   1 
 1   0   1 
 1   1  - 1   1 
 1   0   2  - 2   1 
 1   1  - 2   4  - 3   1 
 1   0   3  - 6   7  - 4   1 
 1   1  - 3   9  - 13   11  - 5   1 
 1   0   4  - 12   22  - 24   16  - 6   1 
 1   1  - 4   16  - 34   46  - 40   22  - 7   1 

 1 
 1   1 
 1   2   1 
 1   3   3   1 
 1   4   6   4   1 
 1   5   10   10   5   1 
 1   6   15   20   15   6   1 
 1   7   21   35   35   21   7   1 
 1   8   28   56   70   56   28   8   1 
 1   9   36   84   126   126   84   36   9   1 

 public   class  TwoDAgain {
     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();

		}

	}
}

run:
 0  
 1   2  
 3   4   5  
 6   7   8   9