How do you check if a number is a perfect square?

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Are the equals() and hashCode() protected methods of object class?

1 Answers   Avaya,

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What is meant by local variable and instance variable?

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Hi Friends, I am beginner in java. what i know about synchonized keyword is,If more that one 1 thread tries to access a particular resource we can lock the method using synchronized keyword. Then after that how the lock is released and how next thread access that.Please explain with example.

5 Answers  

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What about abstract classes in java?

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class A{ some variables; public void a()throws Excepion1,Exception2{....} } class B extends A{ variables... public void a()throws E2,E3{.....} } Qns: here override of methods occurs or not,ore else wil give any compilation error or run properly..plz tell me briefly whts happening with the above codes....

4 Answers   Quinnox,

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Is string is a data type?

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Why are lists ordered in java?

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What is the default value of an object reference declared as an instance variable?

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Can you sort a string in java?

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Write a program to solve producer consumer problem in java?

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Is an integer an object?

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