java 杨辉三角

public class Test{
   public static void main(String[] args) { 
            int row = 6;//要打印几行就输入几 
            int i, j;//i为行，j为列 
            int[][] a = new int[row + 1][row + 1];//为了好理解，二维数组起始为a[1][1] 
            for (i = 1; i <= row; i++) { 
                if (i != 1) { 
                    a[i][1] = 1; 
                    System.out.print(1 + "\t"); 
                } 
                for (j = 2; j < i; j++) { 
                    a[i][j] = a[i - 1][j - 1] + a[i - 1][j]; 
                    System.out.print(a[i][j] + "\t"); 
                } 
                a[i][i] = 1; 
                System.out.println(1); 
            } 
        }
}