解析Java类和对象的初始化过程(3)

public class com.ccb.Framework.enums.CachingEnumResolver extendsjava.lang.Object{
　static {};
　Code: 0: new #2; 
　//class CachingEnumResolver
　3: dup
　4: invokespecial #14; 
　//Method "<init>":()V ① 
　7: putstatic #16; 
　//Field SINGLE_ENUM_RESOLVER:Lcom/ccb/framework/enums/CachingEnumResolver; 
　10: new #18;
　//class HashMap ② 
　13: dup 
　14: invokespecial #19;
　//Method java/util/HashMap."<init>":()V 
　17: putstatic #21;
　//Field CODE_MAP_CACHE:Ljava/util/Map;
　20: getstatic #21; 
　//Field CODE_MAP_CACHE:Ljava/util/Map; 
　23: ldc #23; 
　//String 0 
　25: ldc #25; 
　//String 北京市 
　27: invokeinterface #31, 3;
　//InterfaceMethod java/util/Map.put:(Ljava/lang/Object;Ljava/lang/Object;)
Ljava/lang/Object; ③ 
　32: pop 33: returnprivate com.ccb.framework.enums.CachingEnumResolver(); 
　Code: 0: aload_0 1: invokespecial #34; 
　//Method java/lang/Object."<init>":()V 4: invokestatic #37; 
　//Method initEnums:()V ④ 7: returnpublic static void initEnums(); 
　Code: 0: getstatic #21; 
　//Field CODE_MAP_CACHE:Ljava/util/Map; 
　⑤ 3: ifnonnull 24 6: getstatic #44;
　//Field java/lang/System.out:Ljava/io/PrintStream; 
　9: ldc #46;
　//String CODE_MAP_CACHE为空,问题在这里开始暴露. 
　11: invokevirtual #52;
　//Method java/io/PrintStream.println:(Ljava/lang/String;)V 14: new #18;
　//class HashMap 17: dup 18: invokespecial #19; 
　//Method java/util/HashMap."<init>":()V ⑥ 21: putstatic #21;
　//Field CODE_MAP_CACHE:Ljava/util/Map;
　24: getstatic #21; 
　//Field CODE_MAP_CACHE:Ljava/util/Map;
　27: ldc #54; 
　//String 1 29: ldc #25; 
　//String 北京市 31: invokeinterface #31, 3;
　//InterfaceMethod java/util/Map.put:(Ljava/lang/Object;
　Ljava/lang/Object;)Ljava/lang/Object; 
　⑦ 36: pop 37: getstatic #21; 
　//Field CODE_MAP_CACHE:Ljava/util/Map; 
　40: ldc #56;
　//String 2 42: ldc #58;
　//String 云南省 44: invokeinterface #31, 3;
　//InterfaceMethod java/util/Map.put:(Ljava/lang/Object;Ljava/lang/Object;)
Ljava/lang/Object;
　⑧ 49: pop 50: returnpublic java.util.Map getCache();
　Code: 0: getstatic #21; 
　//Field CODE_MAP_CACHE:Ljava/util/Map;
　3: invokestatic #66; 
　//Method java/util/Collections.unmodifiableMap:(Ljava/util/Map;)Ljava/util/Map; 
　6: areturnpublic static com.ccb.framework.enums.CachingEnumResolver getInstance(); 
　Code: 0: getstatic #16;
　//Field SINGLE_ENUM_RESOLVER:Lcom/ccb/framework/enums/CachingEnumResolver; 
　⑨ 3: areturn}