What is dynamic variable in java and where do we use them

What is object deep copy and shallow copy

Explain the use of Clonable,and serializable interface.

What will happen when ResultSet is not closed

Explain the reason of Out of Memory exception in Java.

Difference between String s="hello"; and String s=new String("hello"); in Java

Explain how to add a button in applet

Can you explain why a constructor doesnt have return type

Purpose of making a method thread safe. How to make a method thread safe without using synchronized keyword

Define collable collections in java.

What is co-variant return type in java

An inner class declared without a class name is known as an anonymous inner class. In case of anonymous inner classes, we declare and instantiate them at the same time. Generally they are used whenever you need to override the method of a class or an interface.

Describe how to implement singleton design pattern in struts.

What is jvmstat

Difference between a plugin and a widget?

URL Encoding.

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