Why string is called as immutable?
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Make a data structure and implement an algorithm to print all the files in a directory. (The root directory can have sub-directories too.)
Which package is always imported by default?
Why Over riding is Run Time Polymorphism?
String and stringbuffer both represent string objects. Can we compare string and stringbuffer in java?
if a java file without any source code is valid java file?
what is an object class?Explain its methods?
How many ways can an argument be passed to a subroutine and explain them?
How is abstraction implemented in java ?
Can an interface be defined inside a class?
what is hashmap& hashtable with example?
What package is math in java?
Can a class extend more than one class?