public class Array2Demo2_3 {

    public static void main(String[] args) {

        //定义初始化

        int[][] arr = new int[3][];//定义高维数组

        arr[0] = new int[2];//高位数组下定义低维数组

        arr[1] = new int[3];

        arr[2] = new int[4];

        arr[0][0] = 1;//给低维数组初始化

        arr[0][1] = 2;

        arr[1][0] = 1;

        arr[1][1] = 2;

        arr[1][2] = 3;

        arr[2][0] = 1;

        arr[2][1] = 2;

        arr[2][2] = 3;

        arr[2][3] = 4;

        for(int i = 0;i<arr.length;i++) {

            for(int j = 0;j<arr[i].length;j++) {

                System.out.print(arr[i][j]);

            }

            System.out.println();

        }

        //-------------------------杨辉三角----------------------------

        int row = 8;

        int[][] arr1 = new int[row][row];

        for(int i = 0;i<row;i++) {

            for(int j = 0;j<=i;j++) {

                if(j == 0||j == i) {

                    arr1[i][j] =1;

                }else {

                    arr1[i][j] = arr1[i-1][j-1]+arr1[i-1][j];

                }

            }

        }

        for(int i = 0;i<row;i++) {

            for(int j = 0;j<=i;j++) {

                System.out.print(arr1[i][j]+" ");

            }

            System.out.println();

        }

    }

}