What is a lock or purpose of locks in java?
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Is zero a positive integer?
What is a method in java?
What are the fileinputstream and fileoutputstream?
What is the difference between static (class) method and instance method?
How do you use substring in java?
What is file in java?
What are checked exceptions?
what is object deep copy and shallow copy and why it is required?
What is main string [] args?
Which collection is ordered in java?
Difference between interface and abstract class with ex.
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Difference between Application and Applet ?