动手动脑（三）

 1 package 统计对象个数;
 2 
 3 public class InitializeBlockClass {
 4     {
 5         field=200;
 6     }
 7     public int field=100;
 8     public InitializeBlockClass(int value) {
 9         this.field=value;
10     }
11     public InitializeBlockClass() {        
12     }
13     public static void main(String[] args) {
14         InitializeBlockClass obj=new InitializeBlockClass();
15         System.out.println(obj.field);
16         obj=new InitializeBlockClass();
17         System.out.println(obj.field);
18     }
19 }

 1 class Root
 2 {
 3     static{
 4         System.out.println("Root的静态初始化块");
 5     }
 6     {
 7         System.out.println("Root的普通初始化块");
 8     }
 9     public Root()
10     {
11         System.out.println("Root的无参数的构造器");
12     }
13 }
14 class Mid extends Root
15 {
16     static{
17         System.out.println("Mid的静态初始化块");
18     }
19     {
20         System.out.println("Mid的普通初始化块");
21     }
22     public Mid()
23     {
24         System.out.println("Mid的无参数的构造器");
25     }
26     public Mid(String msg)
27     {
28         //通过this调用同一类中重载的构造器
29         this();
30         System.out.println("Mid的带参数构造器，其参数值：" + msg);
31     }
32 }
33 class Leaf extends Mid
34 {
35     static{
36         System.out.println("Leaf的静态初始化块");
37     }
38     {
39         System.out.println("Leaf的普通初始化块");
40     }    
41     public Leaf()
42     {
43         //通过super调用父类中有一个字符串参数的构造器
44         super("Java初始化顺序演示");
45         System.out.println("执行Leaf的构造器");
46     }
47 
48 }
49 
50 public class TestStaticInitializeBlock
51 {
52     public static void main(String[] args) 
53     {
54         new Leaf();
55         
56 
57     }
58 }