Why you should not use singleton?
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How will you add panel to a frame?
What is a boolean output?
Difference between nested and inner classes ?
How hashmap increases its size in java?
what is synchronization
What are the actions that can occur when a thread enters blocked state?
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Explain about automatic type conversion in java?
how copy the hashmap object into arraylist at java program?
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What is final keyword in java? Give an example.
What is difference between protected and private?