[20-05-04][Thinking in Java 1]Java Inheritance 1 - Inheritance Syntax 3

 1 package test_1_1;
 2 
 3 public class Root {
 4 
 5     /**
 6      * 继承时的带参构造器
 7      * 
 8      */
 9     
10     public Root(int i) {
11         
12         System.out.println("this is Root");
13     }
14     
15     public Component1 component1 = new Component1(1);
16     public Component2 component2 = new Component2(2);
17     public Component3 component3 = new Component3(3);
18 }

 1 package test_1_1;
 2 
 3 public class Component1 {
 4     
 5     public Component1(int i) {
 6         
 7         System.out.println("this is component1");
 8     }
 9 
10 }

1 package test_1_1;
2 
3 public class Component2 {
4 
5     public Component2(int i) {
6         
7         System.out.println("this is component2");
8     }
9 }

1 package test_1_1;
2 
3 public class Component3 {
4 
5     public Component3(int i) {
6         
7         System.out.println("this is component3");
8     }
9 }

 1 package test_1_1;
 2 
 3 public class Stem extends Root {
 4     
 5     public Stem(int i) {
 6         
 7         super(i);
 8         System.out.println("this is Stem");
 9     }
10 
11     public static void main(String[] args) {
12         
13         Stem stem = new Stem(1);
14     }
15 }