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# Java.util.Scanner :

Java.util.Scanner class is a simple text scanner which can parse primitive typeand string using regular expressions. Following are important points about Scanner.

A scanner breaks its input in into tokens using a delimeter pattrens which by default matches whitespaces.

A scanning operation may block waiting for input.

A scanner is not safe for multithreaded use without external synchronization.

Class Declaration:

Public final class scanner

extends object

implements iterator

There are many others classes used in java for consol input.

lang

math

applet

awt

sql

io

# java.lang.math Class:

The java.lang.math class contains method for performing basic numeric operationssuch as the elementory exponential , logarithm, square root and trignometric functions.

Class Declaration:

Following is the declaration for java.lang.math class:

Public final class math

extends object

Class Methods:

Some methods of this class are:

Static double abs (double a)

Static float abs(float a)

Static int abs(int a)

Static long abs(long a)

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Automatic memory schema like garbage collection makes it so that programmer doesnot have to worry so much about memory management issues, so he or she can focus more on developing the application they need to develop.