1 package face_09;
 2 class Fu {
 3     Fu(){
 4         show();
 5     }
 6     void show() {
 7         System.out.println("hehe");
 8     }
 9 }
10 class Zi extends Fu {
11     int num = 9;
12     Zi(){
13         super();
14         //显示初始化。
15         System.out.println("zi constructor"+ num);
16     }
17     void show() {
18         System.out.println("show.."+num);
19     }
20 }
21 public class Test {
22     public static void main(String[] args) {
23         new Zi();
24     }
25 }
26 //打印show..0
27 //zi constructor9

View Code

 1 package face_09;
 2 class Fu {
 3     
 4     Fu(){
 5         System.out.println("fu constructor run");
 6         show();
 7     }
 8     void show() {
 9         System.out.println("hehe");
10     }
11 }
12 class Zi extends Fu{
13     int num = 8;
14     
15     {
16         System.out.println("constructor code..."+num);
17         num = 10;
18     }
19     Zi(){
20         super();
21         //显示初始化
22         //构造代码块初始化
23         System.out.println("zi constructor..."+ num);
24     }
25     void show() {
26         System.out.println("show..."+num);
27     }
28 }
29 public class Test2 {
30     new Zi();
31 }

View Code

 1 package face_09;
 2 class Fu {
 3     int num = 9;
 4     {
 5         System.out.println("Fu");//1
 6     }
 7     Fu(){
 8         super();//Object
 9         //显示初始化。
10         //构造代码块初始化。
11         show();
12     }
13     void show() {
14         System.out.println("fu show"+num);
15     }
16 }
17 class Zi extends Fu{
18     int num = 8;
19     
20     {
21         System.out.println("Zi");//3 Zi
22     }
23     Zi(){
24         super();
25         //显示初始化
26         //构造代码块初始化
27         show();
28     }
29     void show() {
30         System.out.println("zi show"+num);//2 zi show 0   4, zi show 8
31     }
32 }
33 public class Test20 {
34     new Zi();
35 }

View Code