Java Methods Explained

Methods (also known as functions in some programming languages) in Java are blocks of code designed to perform specific tasks. They are executed when they are called (invoked) from some part of the program. Methods improve code reusability, readability, and organization. Here’s an exploration of methods in Java, including examples on methods with parameters, method overloading, and scope.

Methods with Parameters

Methods can take parameters, allowing you to pass information into methods.


In this example, the greet method takes two parameters and is called with two arguments in the main method.

Method Overloading

Method overloading allows a class to have more than one method with the same name, as long as their parameter lists are different.


Method overloading enables the add method to handle both integer and double inputs by having two definitions with different parameter types.

Scope of Variables in Methods

The scope of a variable is defined by where it is declared. Variables declared inside a method are accessible only within that method.


In this example, the variable number is only accessible within myMethod, demonstrating the concept of variable scope.

Passing Parameters by Value

In Java, method parameters are passed by value. This means that changes made to parameters inside the method do not affect the arguments.


This example illustrates that changes made to the number parameter inside the increment method do not affect the original num variable.

Understanding methods, including how to define them with parameters, overloading them for different data types, and grasping the scope of variables, is fundamental in Java programming. These concepts allow for creating versatile, reusable, and organized code.

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