源代码：
public enum Season { SPIRNG, SUMMER, AUTUMN, WINTER; public String allSeasons() { return SPIRNG.name() + " " + SUMMER.name() + " " + AUTUMN.name() +" " +WINTER.name(); }}编译之后使用javap -c Season.class命令反编译结果：
public final class Season extends java.lang.Enum<Season> { public static final Season SPIRNG; public static final Season SUMMER; public static final Season AUTUMN; public static final Season WINTER; public static Season[] values(); Code: 0: getstatic #1 // Field $VALUES:[LSeason; 3: invokevirtual #2 // Method "[LSeason;".clone:()Ljava/lang/Object; 6: checkcast #3 // class "[LSeason;" 9: areturn public static Season valueOf(java.lang.String); Code: 0: ldc #4 // class Season 2: aload_0 3: invokestatic #5 // Method java/lang/Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum; 6: checkcast #4 // class Season 9: areturn public java.lang.String allSeasons(); Code: 0: new #7 // class java/lang/StringBuilder 3: dup 4: invokespecial #8 // Method java/lang/StringBuilder."<init>":()V 7: getstatic #9 // Field SPIRNG:LSeason; 10: invokevirtual #10 // Method name:()Ljava/lang/String; 13: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 16: ldc #12 // String 18: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 21: getstatic #13 // Field SUMMER:LSeason; 24: invokevirtual #10 // Method name:()Ljava/lang/String; 27: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 30: ldc #12 // String 32: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 35: getstatic #14 // Field AUTUMN:LSeason; 38: invokevirtual #10 // Method name:()Ljava/lang/String; 41: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 44: ldc #12 // String 46: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 49: getstatic #15 // Field WINTER:LSeason; 52: invokevirtual #10 // Method name:()Ljava/lang/String; 55: invokevirtual #11 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 58: invokevirtual #16 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 61: areturn static {}; Code: 0: new #4 // class Season 3: dup 4: ldc #17 // String SPIRNG 6: iconst_0 7: invokespecial #18 // Method "<init>":(Ljava/lang/String;I)V 10: putstatic #9 // Field SPIRNG:LSeason; 13: new #4 // class Season 16: dup 17: ldc #19 // String SUMMER 19: iconst_1 20: invokespecial #18 // Method "<init>":(Ljava/lang/String;I)V 23: putstatic #13 // Field SUMMER:LSeason; 26: new #4 // class Season 29: dup 30: ldc #20 // String AUTUMN 32: iconst_2 33: invokespecial #18 // Method "<init>":(Ljava/lang/String;I)V 36: putstatic #14 // Field AUTUMN:LSeason; 39: new #4 // class Season 42: dup 43: ldc #21 // String WINTER 45: iconst_3 46: invokespecial #18 // Method "<init>":(Ljava/lang/String;I)V 49: putstatic #15 // Field WINTER:LSeason; 52: iconst_4 53: anewarray #4 // class Season 56: dup 57: iconst_0 58: getstatic #9 // Field SPIRNG:LSeason; 61: aastore 62: dup 63: iconst_1 64: getstatic #13 // Field SUMMER:LSeason; 67: aastore 68: dup 69: iconst_2 70: getstatic #14 // Field AUTUMN:LSeason; 73: aastore 74: dup 75: iconst_3 76: getstatic #15 // Field WINTER:LSeason; 79: aastore 80: putstatic #1 // Field $VALUES:[LSeason; 83: return}编译之后使用Java Decompiler的反编译结果：
public enum Season{ SPIRNG, SUMMER, AUTUMN, WINTER; private Season() {} public String allSeasons() { return SPIRNG.name() + " " + SUMMER.name() + " " + AUTUMN.name() + " " + WINTER.name(); }}反编译结果不相同可以分为两部分：
- javap反编译结果包含了static(),valueOf方法；
- javap反编译结果的方法体使用了jvm指令。