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What is sortedmap interface?
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Hi Friends, I am new to java. Can u explain about thread concept.How i know one thread is locked, and how can i force or acquire another thread for lock . Finally how to know thread is released from lock. Explain types of lock(like method level and block level) in thread.
What is comparator in java?
What is the purpose of java?
Describe how to implement singleton design pattern in struts.
What is default switch case? Give example.
Have you ever used hashtable and dictionary?
What is the difference between static and global variables and also define what are volatile variables?
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What is Ideal Design of Class?
How the threads are synchronized?
what Data encapsulation in java?
How we can declare a static variable?
write a program to create an arraylist and listeterator.and value should be enter through keyboard.
Core Java 
