Core Java Interview Questions and Answers
Ques. There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it?Ans. If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface. |
Is it helpful?
Yes
No
Most helpful rated by users:
- How could Java classes direct program messages to the system console, but error messages, say to a file?
- What are the differences between an interface and an abstract class?
- Why would you use a synchronized block vs. synchronized method?
- How can you force garbage collection?
- What are the differences between the methods sleep() and wait()?