【单选题】下面的代码实现了设计模式中的()模式 public class A{ private A instance; private A(){} public static Aget Instance{ if(A==null) instance = new A(); return instance; } }
A. Factory B. AbstractFactory C. Singleton D. Builder
A. Factory B. AbstractFactory C. Singleton D. Builder
举一反三
- 下面的代码实现了设计模式中的什么模式public class A {priv...return instance;}}
- Which of the following is the order of applying object-oriented concept in programming A: instance creating — class defining — use attributes or methods through the instance B: class defining — instance creating — use attributes or methods through the instance C: instance creating — use attributes or methods through the instance — class defining D: class defining — use attributes or methods through the instance —instance creating
- Which of the following is false? ( ) A: A static method must be used to access private static instance variables. B: A static method can be accessed even when no objects of its class have been instantiated. C: A static method has no this reference. D: A static method can call instance methods directly.
- 定义类的关键字是 ( ) A: Class B: class C: Instance D: instance
- An instance member（） A: is also called a static member B: is always a variable C: is never a method D: belongs to a single instance， not to the class as a whole E: always represents an operatio