类变量（静态变量）的值不能被构造函数改写

 1 public class StaticInitializer {
 2     static int j = getI();
 3     static int i = 1;
 4  
 5     static int getI () {
 6         return i;
 7     }
 8    
 9     public static void main(String[] args) {
10         System.out.println(StaticInitializer.j);
11         System.out.println(StaticInitializer.i);
12     }
13 }

 1 public class StaticInitializer {
 2     static int j = getI();
 3     static int i = 1;
 4  
 5     static int getI () {
 6         return i;
 7     }
 8     StaticInitializer()
 9      { i=4;
10       }
11     public static void main(String[] args) {
12         System.out.println(StaticInitializer.j);
13         System.out.println(StaticInitializer.i);
14     }
15 }