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What is garbage collection?

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What do you understand by Synchronization?

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What are different types of access modifiers?

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When we can declare a method as abstract method ?

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Java Virtual Machine (JVM)

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Can abstract modifier be applied to a variable?

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What is abstract class in java?

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Can we define abstract class (as outer class) and class ( inner class) in java ?If Yes give an example .

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How to define an Abstract class?

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Why we define constructor in abstract class in java when we can't initialized it abstract class. Or how constructor of abstract class can used. Give an example

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Can we define abstract class (as inner class) and class ( outer class) in java ?If Yes give an example?

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Abstract method

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Can we declare abstract method private ?

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Can abstract methods synchronized?

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What is interface?

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How to define an Interface?

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Can we create a interface within interface ?If Yes then give an example .How we can call inner interface?

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Can we declare a enum within interface ?If Yes then give an example .How we can call enum ?

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What is output of following ?explain why?

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How many number of non-public class definitions can a source file have?

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How many number of public class definitions can a source file have?

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What happened If we compile and run following code?

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What happens if parent is not serialized and child class are serialized?

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What is difference between HashMap and HashTable?

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What is difference between Arrays and ArrayList ?

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What is ThreadLocal variable in Java?

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