What is the difference between hashset and treeset in java?
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Why sleep()is in Thread and wait() in Object class? Why can't I have both in one class or vice versa?
Why Java doesn’t support multiple inheritance?
What does the “static” keyword mean?
What is the final keyword?
Why do we need variables?
How do you start a new line in java?
What is a variable simple definition?
What super () does in java?
Why do inner class cannot have static declaration except static nested class?
Name few java util classes introduced with java 8 ?
What is java util function?
What is better- service oriented or batch oriented solutions?