How do you check if a number is a perfect square?
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Why does java have different data types for integers and floating-point values?
Difference between array and arraylist.
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How objects are stored in java?
What is a map in java?
In which order the iterator iterates over collection?
Is linkedlist thread safe in java?
which method is used to know the status of the Thread?
What is difference between checked and unchecked exception in java?
What is stack explain?
What is the symbol for line break?
Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?
What if constructor is protected in java?