java 枚举的真面目

源码

public enum EnumTest {

    ONE,
    TWO,
    THREE,
    ;
}

jad -o EnumTest.class

生成EnumTest.jad

反编译后

public final class EnumTest extends Enum
{

    public static EnumTest[] values()
    {
        return (EnumTest[])$VALUES.clone();
    }

    public static EnumTest valueOf(String name)
    {
        return (EnumTest)Enum.valueOf(com/bwatson/service/EnumTest, name);
    }

    private EnumTest(String s, int i)
    {
        super(s, i);
    }

    public static final EnumTest ONE;
    public static final EnumTest TWO;
    public static final EnumTest THREE;
    private static final EnumTest $VALUES[];

    static 
    {
        ONE = new EnumTest("ONE", 0);
        TWO = new EnumTest("TWO", 1);
        THREE = new EnumTest("THREE", 2);
        $VALUES = (new EnumTest[] {
            ONE, TWO, THREE
        });
    }
}

编译器会创建一个有参构造并且是private