why Interface used?
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What is difference between iterator access and index access?
When is an object subject to garbage collection?
what is thread? What are the high-level thread states? Or what are the states associated in the thread? : Java thread
How many types of methods are there in java?
Can a abstract class be declared final?
What are the names of interfaces that doesn't consists of method/s ?
What is a consumer in java?
What is the use join() in Threads ?
Why is logger singleton?
what are ER diagrams?
What do you mean by compiler?
Where the CardLayout is used?