Java Methods


method is a block of code which only runs when it is called.

You can pass data, known as parameters, into a method.

Methods are used to perform certain actions, and they are also known as functions.

But the question is Why use methods?

The Answer is method is To reuse code: define the code once, and use it many times.


How to Create a Method

A method must be declared within a class. It is defined with the name of the method, followed by parentheses (). Java provides some pre-defined methods, such as System.out.println(), but you can also create your own methods to perform certain actions:

Example

Create a method inside Main:

public class Main {
  static void exampleMethod() {
    // code to be executed
  }
}

Example Explained

  • exmpleMethod() is the name of the method
  • static means that the method belongs to the Main class and not an object of the Main class. You will learn more about objects and how to access methods through objects later in this tutorial.
  • void means that this method does not have a return value. You will learn more about return values later in this chapter

Call a Method

To call a method in Java, write the method’s name followed by two parentheses () and a semicolon;

In the following example, exampleMethod() is used to print a text (the action), when it is called:

Example

Inside main, call the myMethod() method:

public class Main {
  static void exampleMethod() {
    System.out.println("I just got executed!");
  }

  public static void main(String[] args) {
    exampleMethod();
  }
}

// Outputs "I just got executed!"

 

A method can also be called multiple times:

Example

public class Main {
  static void exampleMethod() {
    System.out.println("I just got executed!");
  }

  public static void main(String[] args) {
    exampleMethod();
    exampleMethod();
    exampleMethod();
  }
}

 

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