Java 继承中的构造方法

 1 class SuperClass {
 2     private int n;
 3       
 4     SuperClass() {
 5         System.out.println("SuperClass()");
 6     }
 7     
 8   
 9     SuperClass(int n) {
10         System.out.println("SuperClass(" + n + ")");
11         this.n = n;
12     }
13 }
14 
15 class SubClass extends SuperClass {
16     private int n;
17     
18     SubClass(int n) {
19             //super();      //默认调用基类无参的构造方法
20         System.out.println("SubClass(" + n + ")");
21         this.n = n;
22     }
23     
24     SubClass() {
25             super(300);       //调用基类有参的构造方法
26         System.out.println("SubClass()");
27     }
28 }
29 
30 public class TestSuperSub {
31     public static void main(String arg[]) {
32         //SubClass sc1 = new SubClass();
33         SubClass sc2 = new SubClass(400);
34     }
35 }