听力原文:M: I am sorry. I have to leave a bit early. I have an important appointment with my doctor. W: That's fine with me. But you'd better tell the manager. Q: What is the possible relationship between the two speakers? (2)
【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; } }
【单选题】下面的代码实现了设计模式中的什么模式 public class A { private A instance; private A() { } public static A getInstance() { if ( A == null ) instance = new A(); return instance; } }