java methods

A 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.

Why use methods? To reuse code: define the code once, and use

it many times.

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 myMethod() {

    // code to be executed

  }

}

Example Explained

myMethod() 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, myMethod() is used to print a text (the action), when it is called:

Example

Inside main, call the

myMethod() method:

public class Main {

  static void myMethod() {

    System.out.println("I just got executed!");

  }



  public static void main(String[] args) {

    myMethod();

  }

}



// Outputs "I just got executed!"

Try it Yourself »

A method can also be called multiple times:

Example

public class Main {

  static void myMethod() {

    System.out.println("I just got executed!");

  }



  public static void main(String[] args) {

    myMethod();

    myMethod();

    myMethod();

  }

}



// I just got executed!

// I just got executed!

// I just got executed!

Try it Yourself »

In the next chapter, Method Parameters, you will learn how to pass data (parameters) into a method.

Test Yourself With Exercises

Exercise:

Insert the missing part to call myMethod from main.

Start the Exercise