Why null value is used in string?
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What is object of class in java?
Why do I need to declare the type of a variable in java?
What is the difference between applet and application?
Which is bigger double or float?
What are the types of literals?
What is the concatenation operator in java?
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Where is singleton pattern used?
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Is arraylist sorted in java?
What are thread priorities and importance of thread priorities in java?
Difference between Reader/Writer and InputStream/Output Stream?
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