What is compiler and what its output.
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What are jee technologies?
What is a website container?
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 the use of bean managed and container managed with example?
What are the default and parameterized constructors?
What are the problems faced by java programmers who don't use layout managers?
Discuss 2D arrays.
What is the difference between JVM and JRE?
Explain about fail safe iterators in java?
Name the runtime exceptions that occurs frequently?
what is polymorphism?
Explain about field hiding in java?
Core Java 
