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What is garbage collection?

What do you understand by Synchronization?

What are different types of access modifiers?

When we can declare a method as abstract method ?

Java Virtual Machine (JVM)

Can abstract modifier be applied to a variable?

What is abstract class in java?

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

How to define an Abstract class?

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

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

Abstract method

Can we declare abstract method private ?

Can abstract methods synchronized?

What is interface?

How to define an Interface?

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

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

What is output of following ?explain why?

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

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

What happened If we compile and run following code?

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

What is difference between HashMap and HashTable?

What is difference between Arrays and ArrayList ?

What is ThreadLocal variable in Java?