upcastenum.java

来自「Thinking in JAVA第四版源代码」· Java 代码 · 共 18 行

//: enumerated/UpcastEnum.java
// No values() method if you upcast an enum

enum Search { HITHER, YON }

public class UpcastEnum {
  public static void main(String[] args) {
    Search[] vals = Search.values();
    Enum e = Search.HITHER; // Upcast
    // e.values(); // No values() in Enum
    for(Enum en : e.getClass().getEnumConstants())
      System.out.println(en);
  }
} /* Output:
HITHER
YON
*///:~