nonenum.java

来自「《Thinking in Java 4th Edition》 Source Co」· Java 代码 · 共 16 行

//: enumerated/NonEnum.java

public class NonEnum {
  public static void main(String[] args) {
    Class<Integer> intClass = Integer.class;
    try {
      for(Object en : intClass.getEnumConstants())
        System.out.println(en);
    } catch(Exception e) {
      System.out.println(e);
    }
  }
} /* Output:
java.lang.NullPointerException
*///:~