Can a boolean be null java?

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What is static data type in java?

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Java Compiler is stored in JDK, JRE or JVM?

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can we access the super class method using subclass object?

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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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Which are different kinds of source code?

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What is anonymous class?

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what are different ways in which a thread can enter the waiting state? : Java thread

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Difference between static methods, static variables, and static classes in Java.

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How to perform quicksort in java?

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What is diamond operator in java?

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Is hashset ordered java?

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