杨辉三角，总是不对，大佬帮忙看一下

import java.util.Scanner;
public class  Demo16{
    public static void main(String[] args){
        /*杨辉三角
             1
            1 1
           1 2 1
          1 3 3 1
         1 4 6 4 1
         */
         Scanner sc=new Scanner(System.in);
         int sum=0;
         //System.out.println("请输入行数，已确定杨辉三角大小：");
         //int a=sc.nextInt();
         int m=1;
         int shu[][]=new int[5][5];
         shu[0][0]=1;
         for(int i=0;i<5;i++){
             for(int k=5;k>i;k--){
                 System.out.print(" ");
             }
             for(int j=0;j<=i;j++){
                 if(j==0||j==i){
                     System.out.print(m+" ");
                 }else{
                     shu[i][j]=shu[i-1][j]+shu[i-1][j-1];
                     System.out.print(shu[i][j]+" ");
                 }   
                 
             }
             System.out.println();
         }
    }
}