在java中,这样写switch语句有什么不妥,为什么一直提示异常?

        int aa = 1;

        switch (aa){
            case Fruit.apple.getValue():
                System.out.println("apple");
                break;
            case Fruit.banana.getValue():
                System.out.println("banana");
                break;;
            case Fruit.pare.getValue():
                System.out.println("pare");
                break;
        }

//switch case中，case这里的判断条件只能是常量表达式。
 case Fruit.apple.getValue():
                System.out.println("apple");
                break;

 switch (aa){
            case 1:
                System.out.println("apple");
                break;
         case 2:
                System.out.println("banana");
                break;
 }

		enum Fruit {
			Apple, Orange
		}
		
		Fruit a = Fruit.Apple;

		switch (a) {
		case Apple:
		case Orange:
			break;
		}