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JAVA PROGRAMMING

Introduction to Method

A method is sub-routine containing code that operates on data member of the class. 

The Method Declaration

At minimum, a method declaration has a name and a return type indicating the data type of the value returned by the method: 
returnType methodName() {
. . .
}

This method declaration is very basic. Methods have many other attributes such as arguments, access control, and so on. This section will cover these topics as well as expand upon the features illustrated in the method declaration above. 

Passing Information into a Method
Perhaps the most commonly used optional component of a method declaration are method parameters. Similar to functions in other programming languages, Java methods accept input from the caller through its parameters. Parameters provide information to the method from outside the scope of the method. 

The Method Body

The method body is where all of the action of a method takes place; the method body contains all of the legal Java instructions that implement the method. 

Here, returnType specifies the type of data returned by the method. This can be any valid type, including class types that you create. The name of the method is specifying by name. The parameter-list is a sequence of parameters.

Adding method to the Box class 

Let's begin by adding a method to the Box class. This program includes a method inside the box class to compute it.

Here is sample program for simple method

Passing parameters to a method

A sample programming using returning value