如何看一个报错异常

package com.example.demo.utils;

public class Test {
    public void add (int i){
        System.out.println("add");
        divide(i);
    }

    public void divide(int i){
        System.out.println("divide");
        multiply(i);
    }

    public void multiply(int i){
        System.out.println("multiply");
        System.out.println(51/i);
    }

    public static void main(String[] args) {
        Test test = new Test();
        test.add(0);
    }
}

看报错

看debug