Which one will take more memory: an int or integer?

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How can we make copy of a java object?

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What is casting?

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Matrix multiplication only using OOP concepts .

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What are different types of constants?

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In how many ways we can create threads in java?

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all are saying java doesn't support multiple inheritance but by default Object class is super class for all the user defined classes and we can extend atmost one class so each class can extend more than one class so java supports multiple inheritance?i am confused with this,pls any one explain me.

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How hashmap works in java?

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how system.out.println() works?

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What does the string method compareto () do?

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What is the use of ?this??

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What is percentage in java?

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