try-catch-finally用法

public class Main {
    public static void main(String[] args) {
        try {
            int a = 10;
            int b;
            for (int i = 2;i >= -1;i--){
                b = a / i;
                System.out.println("i="+i);
            }
        }catch (ArithmeticException e){
            System.out.println("除数为0！！！");
        }catch (Exception e){
            System.out.println("未知错误");
        }finally {
            System.out.println("退出安全判断");
        }
    }
}