打印出杨辉三角形

package cskaoyan;
 
public class cskaoyan33 {
    @org.junit.Test
    public void pascalsTriangle() {
        int[][] arr = new int[6][6];
 
        for (int i = 0; i < 6; i++) {
            arr[i][0] = 1;
            arr[i][i] = 1;
        }
 
        for (int i = 2; i < 6; i++) {
            for (int j = 1; j < i; j++) {
                arr[i][j] = arr[i - 1][j - 1] + arr[i - 1][j];
            }
        }
 
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < i + 1; j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }
    }
}