由于Singleton应该由枚举组成(请参见“有效Java”):
public enum FiveInstance { INSTANCE1, INSTANCE2, INSTANCE3, INSTANCE4, INSTANCE5; public void anyMethod() {}}格蕾兹·加德

由于Singleton应该由枚举组成(请参见“有效Java”):
public enum FiveInstance { INSTANCE1, INSTANCE2, INSTANCE3, INSTANCE4, INSTANCE5; public void anyMethod() {}}格蕾兹·加德