How can you make sure that your singleton class will always return single instance in multi-threaded environment?

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What are static blocks and static initalizers in java ?

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What is a layout manager?

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How do weakhashmap works?

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Can we have two main methods in a java class?

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List interface?

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What is polymorphism java example?

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How to excute - Interface - Inner class- method can any one tell how to execute/ call this main method public interface abc { static int i=0; void dd(); class a1 { a1() { int j; System.out.println("inside"); }; public static void main(String a1[]) { System.out.println("in interfia"); } } }

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There are 2 different ways to create an object. a)By using keyword "new" b)By using Class.forName ("className").newInstance(); What is the difference between these 2 methods.

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What is bytecode verifier?

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1.what is the exact difference between applet and frame? 2.Do we use main method in frames?

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How do you replace all in word?

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