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What is bom encoding?
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What is immutable class? how to make a Class explicitly "Immutable"?Wap to make a class explicitly immutable.
When you declare a method as abstract method ?
How are java objects passed to a method and what are native methods?
What is mean by UML? what is the use? where we are using?
What is abstract class constructor called?
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What happens if an exception is throws from an object's constructor?
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What are basic keywords?
Difference between start() and run() method of thread class?
Should you use singleton pattern?
Core Java 
