Method Signatures

Like other languages, java also permits to work with the methods declarations and method definitions. To define a method in java we need to abide by the certain java syntax known as the method signature to create a method within a class.

Methods in Object Oriented Programming plays a crucial role in achieving some functionality while defining a class.

For example  

Here Access Modifier is public
Return Type is void
Method Name is main
List of Arguments with comma separation is String ags[] that indicates the command line arguments

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http://www.roseindia.net/java/learn-java-in-a-day/class.shtml