How do you check if a number is a perfect square?
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What is advantage of using threads?
Can we clone singleton class in java?
What is a class object?
I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?
What is queue in java?
I have one Shopping cart application, i that i have selected some items, while clicking submit button by mistake i have clicked twice or trice, that time items are selected twice or trice. Actually i want only one copy of items but its selected twice or trice. So how can we avoid this problem?
What is difference between final and immutable?
How to change the priority of thread or how to set the priority of thread?
How will you measure that int takes up only 32 bits in memory?
What is prime number in java?
Why declare Main() method as a static in java ?
Convert Binary tree to linked list.