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What is difference between checked and unchecked exception in java?
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Why should we create an object? what is a need of it? Apart from access members of a class i want what is a need of object what does it contain?? In normal class to access any member of thaht class we create object where as for static class we access its members using class name. what is a difference between them... thanks in advance.
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In the HashMap, we know the values but we dont know the key, then how can we get the key from HashMap ?????
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Core Java 
