What is a key in java?


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More Core Java Interview Questions

What is prime number in java?

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How many methods does cloneable interface contains?

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Is char * a string?

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Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm?

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You're given a Boolean 2D matrix, can you find the number of islands?

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Can we have two methods in a class with the same name?

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Why we need to serialize the object

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How can a class be accessed, If no access modifiers are declared?

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What is the exact difference in between unicast and multicast object? Where we will use?

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What super () does in java?

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What is a databasemetadata?

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Can we use catch statement for checked exceptions?

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