package com.imooc.chapter13test;

public class Car {
    static void buyCar() throws NullPointerException{
        Object car = null;
        car.toString();
    }

    public static void main(String[] args) {

        try {
            buyCar();
        } catch (NullPointerException e) {
            System.out.println("买车遇到异常: " + e.getMessage());
        }
    }
}

buyCar()方法声明可能抛出的空指针异常，由调用该方法的调用者处理