java二维数组定义初始化-杨辉三角

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();
}
}}