注意静态代码块的使用

public class java9_7{   static String a="string-a";   static String b;   String c="string-c";   String d;   static   {   printStatic("before static");   b="string-b";   printStatic("after static");   }   public static void printStatic(String title)   {   System.out.println("--------"+title+"-------");   System.out.println("a=\""+a+"\"");   System.out.println("b=\""+b+"\"");   }   public java9_7()   {   print("before constructor");   d="string-d";   print("after constructor");   }   public void print(String title)   {   System.out.println("--------"+title+"-------");   System.out.println("a=\""+a+"\"");   System.out.println("b=\""+b+"\"");   System.out.println("c=\""+c+"\"");   System.out.println("d=\""+d+"\"");      }   public static void main(String args[])   {   new java9_7();   }}