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Why pointers are not used in java?
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diffrence b\w println() and printf()
Why hashmap is used in java?
Write the program numbers into words.For example 2345==two thousand three hundred fourty five
What are the two main uses of volatile in Java?
What is the code inside the public void actionPerformed(ActionEvent ae) override method in Applet [ Condition:- you have one TextField and One Button , you have to enter any color name inside the TextField, when you click on Button Your background will change according to your input color name]
What are the drawbacks of singleton class?
relation between list and linked list
what are upcasting and downcasting?
What are the different types of data structures in java?
Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm?
What is the difference between jfc & wfc?
What is not thread safe?
Core Java 
