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
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
举一反三
- 定义类的关键字是 ( ) A: Class B: class C: Instance D: instance
- An object is an instance of a A: program B: class C: method D: data
- 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.
- There are following business statements for an information system:①A customer submit 0 or more orders;②An order can only be submitted by one customer. There are two classes in the system “Customer” and “Order”. For each instance of Order Class, there are ____ instance(s) of Customer Class; while for each instance of Customer Class, there are ____ instance(s) of Order Class. A: (1) 1 (2) 1 B: (1) 1 (2) 1 or more C: (1) 1 (2) 0 or more D: (1) 0 or more (2) 1
- 【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