java枚举的原理分析

Season extends java.lang.Enum<Season>

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

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