枚举 switch 的兼容性

  类文件: ['Client$1.class', 'Client.class']
  Client$1 的字段: ['static final int[] $SwitchMap$Color;', '6: putstatic #7 // Field $SwitchMap$Color:[I', '9: getstatic #7 // Field $SwitchMap$Color:[I']
  Client$1 静态初始化里的关键指令(前 10 条):
    0: invokestatic #1 // Method Color.values:()[LColor;
    6: putstatic #7 // Field $SwitchMap$Color:[I
    9: getstatic #7 // Field $SwitchMap$Color:[I
    12: getstatic #13 // Field Color.RED:LColor;
    15: invokevirtual #17 // Method Color.ordinal:()I
    18: iconst_1
    19: iastore
    23: astore_0
    24: getstatic #7 // Field $SwitchMap$Color:[I
    27: getstatic #23 // Field Color.GREEN:LColor;
  异常表条目数(每个 case 常量一个 try/catch NoSuchFieldError): 2
  exprExhaustive(没有 default 的 switch 表达式)的字节码关键行:
    0: getstatic #9 // Field Client$1.$SwitchMap$Color:[I
    4: invokevirtual #15 // Method Color.ordinal:()I
    7: iaload
    8: lookupswitch { // 2
    36: new #29 // class java/lang/MatchException
    42: invokespecial #31 // Method java/lang/MatchException."<init>":(Ljava/lang/String;Ljava/lang/Throwable;)V
    45: athrow

  [v1]
  枚举现在的常量:RED(0) GREEN(1)
    stmtDefault      RED→红  GREEN→绿
    stmtNoDefault    RED→红  GREEN→绿
    exprExhaustive   RED→红  GREEN→绿
    exprDefault      RED→红  GREEN→绿
    ordinalSwitch    RED→ordinal 0  GREEN→ordinal 1
  [v2-新增在末尾]
  枚举现在的常量:RED(0) GREEN(1) BLUE(2)
    stmtDefault      RED→红  GREEN→绿  BLUE→其它
    stmtNoDefault    RED→红  GREEN→绿  BLUE→未匹配
    exprExhaustive   RED→红  GREEN→绿  BLUE→MatchException
    exprDefault      RED→红  GREEN→绿  BLUE→其它
    ordinalSwitch    RED→ordinal 0  GREEN→ordinal 1  BLUE→ordinal 其它
  [v3-新增在中间]
  枚举现在的常量:RED(0) BLUE(1) GREEN(2)
    stmtDefault      RED→红  BLUE→其它  GREEN→绿
    stmtNoDefault    RED→红  BLUE→未匹配  GREEN→绿
    exprExhaustive   RED→红  BLUE→MatchException  GREEN→绿
    exprDefault      RED→红  BLUE→其它  GREEN→绿
    ordinalSwitch    RED→ordinal 0  BLUE→ordinal 1  GREEN→ordinal 其它
  [v4-重排]
  枚举现在的常量:GREEN(0) RED(1)
    stmtDefault      GREEN→绿  RED→红
    stmtNoDefault    GREEN→绿  RED→红
    exprExhaustive   GREEN→绿  RED→红
    exprDefault      GREEN→绿  RED→红
    ordinalSwitch    GREEN→ordinal 0  RED→ordinal 1
  [v5-删除 GREEN]
  枚举现在的常量:RED(0)
    stmtDefault      RED→红
    stmtNoDefault    RED→红
    exprExhaustive   RED→红
    exprDefault      RED→红
    ordinalSwitch    RED→ordinal 0
  [v6-重命名 GREEN→LIME]
  枚举现在的常量:RED(0) LIME(1)
    stmtDefault      RED→红  LIME→其它
    stmtNoDefault    RED→红  LIME→未匹配
    exprExhaustive   RED→红  LIME→MatchException
    exprDefault      RED→红  LIME→其它
    ordinalSwitch    RED→ordinal 0  LIME→ordinal 1