Error：Implicit super constructor People() is undefined for default constructor. Must define an explicit constructor，explicitconstructor

Error：Implicit super constructor People() is undefined for default constructor. Must define an explicit constructor，explicitconstructor

當子類繼承父類的時候，若父類沒有定義帶參的構造方法，則子類可以繼承父類的默認構造方法

當父類中定義了帶參的構造方法，子類必須顯式的調用父類的構造方法

若此時，子類還想調用父類的默認構造方法，必須在父類中明確聲明默認的構造方法

 1 package com.gaohui;
 2 
 3 public class Test {
 4     public static void main(String [] args){
 5         Man man = new Man(24,"Tom");
 6         man.eat();
 7         man.eat("Tom");
 8         man.Exercise();
 9         Woman woman = new Woman();
10         
11     }
12     
13 }
14 
15 class People{
16     private int age;
17     private String name;
18     private String sex;
19     
20     public People(){
21         //如果父類沒有聲明默認的構造方法，子類繼承時必須顯式調用父類定義的構造方法
22     }
23     
24     public People(int age, String name){
25         System.out.println("構造方法一執行了！");
26     }
27     
28     public void eat(){
29         System.out.println("People need to eat!");
30     }
31     
32     public void eat(String name){
33         System.out.println(name+" needs to eat!");
34     }
35     
36     
37 }
38 
39 class Man extends People{
40     public  Man (int age, String name){//由於父類的構造方法是有參的，必須顯式調用父類的方法
41         super(age,name);
42     }
43     
44     public void Exercise(){
45         System.out.println("I love doing exercise!");
46     }
47 }
48 
49 
50 class Woman extends People{
51     
52 }