主要是因为Construct类中的newInstance方法的一个判断条件
if ((this.clazz.getModifiers() & 16384) != 0) {
throw new IllegalArgumentException("Cannot reflectively create enum objects");
}
如果是枚举类型，就会抛出异常，因此只有枚举才能避免被反射破坏
反射在通过newInstance创建对象时，会检查该类是否ENUM修饰，如果是则抛出异常，反射失败
public T newInstance(Object... initargs) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
if (!this.override) {
Class<?> caller = Reflection.getCallerClass();
this.checkAccess(caller, this.clazz, this.clazz, this.modifiers);
}
if ((this.clazz.getModifiers() & 16384) != 0) {
throw new IllegalArgumentException("Cannot reflectively create enum objects");
} else {
ConstructorAccessor ca = this.constructorAccessor;
if (ca == null) {
ca = this.acquireConstructorAccessor();
}
T inst = ca.newInstance(initargs);
return inst;
}
}
