JAVA 枚举类型的问题。

Input 的定义：

//: enumerated/Input.java
package enumerated;
import java.util.*;

public enum Input {
  NICKEL(5), DIME(10), QUARTER(25), DOLLAR(100),
  TOOTHPASTE(200), CHIPS(75), SODA(100), SOAP(50),
  ABORT_TRANSACTION {
    public int amount() { // Disallow
      throw new RuntimeException("ABORT.amount()");
    }
  },
  STOP { // This must be the last instance.
    public int amount() { // Disallow
      throw new RuntimeException("SHUT_DOWN.amount()");
    }
  };	
  int value; // In cents
  Input(int value) { this.value = value; }
  Input() {}
  int amount() { return value; }; // In cents
  static Random rand = new Random(47);
  public static Input randomSelection() {
    // Don't include STOP:
    return values()[rand.nextInt(values().length - 1)];
  }
} ///:~

Category 的定义：

package chapter19;
import java.util.EnumMap;
//import net.mindview.util.*;
import static enumerated.Input.*;
//import static net.mindview.util.Print.*;
enum Category {
	MONEY(NICKEL, DIME, QUARTER, DOLLAR),
	ITEM_SELECTION(TOOTHPASTE, CHIPS, SODA, SOAP),
	QUIT_TRANSACTION(ABORT_TRANSACTION),
	SHUT_DOWN(STOP);
	private Input[] values;
	Category(Input...types) { values = types; }
	private static EnumMap<Input, Category> categories =
			new EnumMap<Input, Category>(Input.class);
	static {
		for(Category c : Category.class.getEnumConstants())
			for(Input type : c.values)
				categories.put(type, c);
	}
	public static Category categorize(Input input) {
		return categories.get(input);
	}
}

在 Category 中声明实例时有错误，每个实例名下面都带下划线，错误是： The constructor Category(Input, Input, Input, Input) is undefined 但是我明明定义了啊，请问是什么问题