Method

Method is sub block of a class that contains logic of that class

A method in object-oriented programming (OOP) is a procedure associated with a message and an object. An object is mostly made up of data and behavior, which form the interface that an object presents to the outside world. Data is represented as properties of the object and behavior as methods. For example, a Window object would have methods such as open and close, while its state (whether it is opened or closed) would be a property.

Public static void main(Strings[] args)
{
......................
......................
......................
}

In class-based programming, methods are defined in a class, and objects are instances of a given class. One of the most important capabilities that a method provides is method overriding. The same name can be used for multiple different kinds of classes. This allows the sending objects to invoke behaviors and to delegate the implementation of those behaviors to the receiving object.


A method in Java programming sets the behavior of a class object. For example, an object can send an area message to another object and the appropriate formula is invoked whether the receiving object is a rectangle, circle, triangle, etc.

Methods also provide the interface that other classes use to access and modify the data properties of an object. This is known as encapsulation. Encapsulation and overriding are the two primary distinguishing features between methods and procedure calls

Defining Methods

Here is an example of a typical method declaration:

public double calculateAnswer(double wingSpan, int numberOfEngines, double length, double grossTons)

{

//do the calculation here

}

The only required elements of a method declaration are the method's return type, name, a pair of parentheses, (), and a body between braces, {}.

More generally, method declarations have six components, in order:

Modifiers—such as public, private, and others you will learn about later.

The return type—the data type of the value returned by the method, or void if the method does not return a value.

The method name—the rules for field names apply to method names as well, but the convention is a little different.

The parameter list in parenthesis—a comma-delimited list of input parameters, preceded by their data types, enclosed by parentheses, (). If there are no parameters, you must use empty parentheses.

An exception list—to be discussed later.

The method body, enclosed between braces—the method's code, including the declaration of local variables, goes here.



Modifiers, return types, and parameters will be discussed later in this lesson. Exceptions are discussed in a later lesson.

Naming a Method

Although a method name can be any legal identifier, code conventions restrict method names. By convention, method names should be a verb in lowercase or a multi-word name that begins with a verb in lowercase, followed by adjectives, nouns, etc. In multi-word names, the first letter of each of the second and following words should be capitalized. Here are some examples:

run
runFast
getBackground
getFinalData
compareTo
setX
isEmpty

Types of Methods

Based on Modifiers


Static Method
non-static Method

Based on Return type

Void
non-void

Base on Parameter

Parameterized
non-parameterizedReferences By: wikipedia share on :        :  

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