1、枚举是继承了抽象类Enum的类。
Season extends java.lang.Enum<Season>
2、通过一段静态代码块初始化枚举。
static {};
descriptor: ()V
flags: ACC_STATIC
Code:
stack=4, locals=0, args_size=0
0: new #4 // class io/github/yehongzhi/user/redisLock/Season
3: dup
4: ldc #7 // String SPRING
6: iconst_0
7: invokespecial #8 // Method "<init>":(Ljava/lang/String;I)V
10: putstatic #9 // Field SPRING:Lio/github/yehongzhi/user/redisLock/Season;
13: new #4 // class io/github/yehongzhi/user/redisLock/Season
16: dup
17: ldc #10 // String SUMMER
19: iconst_1
20: invokespecial #8 // Method "<init>":(Ljava/lang/String;I)V
23: putstatic #11 // Field SUMMER:Lio/github/yehongzhi/user/redisLock/Season;
26: new #4 // class io/github/yehongzhi/user/redisLock/Season
29: dup
30: ldc #12 // String AUTUMN
32: iconst_2
33: invokespecial #8 // Method "<init>":(Ljava/lang/String;I)V
36: putstatic #13 // Field AUTUMN:Lio/github/yehongzhi/user/redisLock/Season;
39: new #4 // class io/github/yehongzhi/user/redisLock/Season
42: dup
43: ldc #14 // String WINTER
45: iconst_3
46: invokespecial #8 // Method "<init>":(Ljava/lang/String;I)V
49: putstatic #15 // Field WINTER:Lio/github/yehongzhi/user/redisLock/Season;
52: iconst_4
53: anewarray #4 // class io/github/yehongzhi/user/redisLock/Season
56: dup
57: iconst_0
58: getstatic #9 // Field SPRING:Lio/github/yehongzhi/user/redisLock/Season;
61: aastore
62: dup
63: iconst_1
64: getstatic #11 // Field SUMMER:Lio/github/yehongzhi/user/redisLock/Season;
67: aastore
68: dup
69: iconst_2
70: getstatic #13 // Field AUTUMN:Lio/github/yehongzhi/user/redisLock/Season;
73: aastore
74: dup
75: iconst_3
76: getstatic #15 // Field WINTER:Lio/github/yehongzhi/user/redisLock/Season;
79: aastore
80: putstatic #1 // Field $VALUES:[Lio/github/yehongzhi/user/redisLock/Season;
83: return这段静态代码块的作用就是生成四个静态常量字段的值，还生成了$VALUES字段，用于保存枚举类定义的枚举常量。
3、关于values()方法，这是一个静态方法，作用是返回该枚举类的数组，底层实现原理，其实是这样的。
public static io.github.yehongzhi.user.redisLock.Season[] values(); Code: 0: getstatic #1 // Field $VALUES:[Lio/github/yehongzhi/user/redisLock/Season; 3: invokevirtual #2 // Method "[Lio/github/yehongzhi/user/redisLock/Season;".clone:()Ljava/lang/Object; 6: checkcast #3 // class "[Lio/github/yehongzhi/user/redisLock/Season;" 9: areturn
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