What do you understand by casting in java language?
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what is a thread?
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Can we have a try block without catch block?
In the HashMap, we know the values but we dont know the key, then how can we get the key from HashMap ?????
what is comparable and comparator interface?
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How to sort a vector elements that contains the user define class object? (Note: If Suppose consider, A Student class contain two data members. They are String studentName and int rollNo. I am creating Four objects for this class, each object contains students details like name and roll no. Now i am storing that objects in vector and if i retiving the elements from the vector means then it should be display in sorting order)
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What is void class in java?
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