What are the different types of collections in java?

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Is there any difference between nested classes and inner classes?

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system.out.println(1 + 3);

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What is final keyword in java?

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What does indexof mean?

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This is my code i have a doubt class ab implements a,b { public void add() { System.out.println("Hi") } } interface a { public void add(); } interface b { public void add(); } in this code i have two interface implemented in the class has same method.just i want to know which method of interface implemented in the class. interface a or interface b? confused me .

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What is the difference between length and length() method in java?

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What is string immutability?

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What is class forname used for?

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Is cout buffered?

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Explain about fail fast iterators in java?

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What are operators and its types?

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