万物皆可TryCatch之杨辉三角
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int n = new Scanner(System.in).nextInt();
int[][] arr = new int[n][n];
for (int i = 0; i < n; i++) {
for (int j = 0; j < i+1; j++) {
try {
arr[i][j] = arr[i - 1][j] + arr[i - 1][j - 1];
System.out.print(arr[i][j] + " ");
} catch (IndexOutOfBoundsException e) {
//第一列赋值时会发生数组越界异常
arr[i][j] = 1;
System.out.print(arr[i][j] + " ");
}
}
System.out.println();
}
}
}
try…catch语句太精妙了