二维数组的练习

public class w {
    public static void main(String[] args){
        int[][] m=new int[][]{{3,8,2},{2,7},{9,0,1,6}};
        int sum=0;
        for (int i=0;i<m.length;i++){
            for (int j=0;j<m[i].length;j++){
                System.out.print(m[i][j]+"\t");
                sum+=m[i][j];
            }
            System.out.println();
        }
        System.out.println(sum);
    }
}

public class w {
    public static void main(String[] args){
        int[][] a=new int[10][];
        //初始化二维数组
        for (int i=0;i<a.length;i++){
            a[i]=new int[i+1];//第i行有i+1个元素
        }
        //为每个二维数组赋值
        for (int i=0;i<a.length;i++){
            for (int j=0;j<a[i].length;j++){
                a[i][0]=a[i][i]=1;
                if (i>1 && j>0 && j<i){
                    a[i][j]=a[i-1][j-1]+a[i-1][j];
                }
            }
        }
        //遍历二维数组
        for (int i=0;i<a.length;i++){
            for (int j=0;j<a[i].length;j++){
                System.out.print(a[i][j]+"\t");
            }
            System.out.println();
        }
    }
}