子类继承父类时JVM报出Error：Implicit super constructor People() is undefined for default constructor. Must define an explicit constructor

当子类继承父类的时候，若父类没有定义带参的构造方法，则子类可以继承父类的默认构造方法

当父类中定义了带参的构造方法，子类必须显式的调用父类的构造方法

若此时，子类还想调用父类的默认构造方法，必须在父类中明确声明默认的构造方法

package com.gaohui;

public class Test {
    public static void main(String [] args){
        Man man = new Man(24,"Tom");
        man.eat();
        man.eat("Tom");
        man.Exercise();
        Woman woman = new Woman();
        
    }
    
}

class People{
    private int age;
    private String name;
    private String sex;
    
    public People(){
        //如果父类没有声明默认的构造方法，子类继承时必须显式调用父类定义的构造方法
    }
    
    public People(int age, String name){
        System.out.println("构造方法一执行了！");
    }
    
    public void eat(){
        System.out.println("People need to eat!");
    }
    
    public void eat(String name){
        System.out.println(name+" needs to eat!");
    }
    
    
}

class Man extends People{
    public  Man (int age, String name){//由于父类的构造方法是有参的，必须显式调用父类的方法
        super(age,name);
    }
    
    public void Exercise(){
        System.out.println("I love doing exercise!");
    }
}


class Woman extends People{
    
}