Name the packages in JDK?

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What is class array in java?

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What makes a function well defined?

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Is java jre still free?

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What is actual difference between statement,prepared statement and callable statement and when we have to use it? pls post a answer with code and clear explanation. thanks

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What is the generic class?

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Does a class inherit the constructor of its super class?if it does, how can you hide that constructor? if it doesnot how can you call it from the sub class?

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where singleton classes are used in j2ee web application.can we use it for connection pooling.

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How can we achieve thread safety in java?

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Difference between predicate, supplier and consumer ?

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In which language JVM (Java Virtual Machine) is implemented

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How to implement an arraylist in java?

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