What is string in java? String is a data type?


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What is string pool in java?

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IN java collections we have both interfaces and classes. instead of using interfaces why we can't use classes only like that why we can't use interfaces only. why we need two things interface and class.

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string is immutable? right every one knows that, my question is it advantage or disadvantage making string immutable?

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What are the different http methods?

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