Core Java Interview Questions 1 What is the difference between an Abstract class and Interface?

181) What happens when you add a double value to a
String?
The result is a String object.
182) What is your platform's default character encoding?
If you are running Java on English Windows platforms, it is probably Cp1252. If you are
running Java on English Solaris platforms, it is most likely 8859_1..
183) Which package is always imported by default?
The java.lang package is always imported by default.
184) What interface must an object implement before it
can be written to a stream as an object?
An object must implement the Serializable or Externalizable interface before it can be
written to a stream as an object.
185) How are this and super used?
this is used to refer to the current object instance. super is used to refer to the variables
and methods of the superclass of the current object instance.
186) What is the purpose of garbage collection?
The purpose of garbage collection is to identify and discard objects that are no longer
needed by a program so that their resources may be reclaimed and reused.

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