Does collectionutils isempty check for null?
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After compilation of java program we'll get .class code. If it's generated in OS Windows XP will it work on OS Linux? If yes why? If no why?
What is constructor
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What is the multi-catch block in java?
Give the difference between the println method and sqrt method?
Explain the concept of polymorphism with examples?
What is Enum in Java?
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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In which way does a Primitive data type is passed ?
Does java have extension methods?
What do you mean by order of precedence and associativity?
How to make a class immutable?
What is garbage collector?