Java Methods

methods in java

Methods define behavior. A Java Methods is a collection of statements that are grouped together to perform an operation. System.out.println() is an example of a method.

You can define your own methods to perform your desired tasks.

Let’s consider the following code:

                    class MyClass {

  static void sayHello() {

    System.out.println(“Hello World!”);

  }

  public static void main(String[ ] args) {

    sayHello();

  }

}

// Outputs “Hello World!”


Calling Methods:

You can call a method as many times as necessary.

When a method runs, the code jumps down to where the method is defined, executes the code inside of it, then goes back and proceeds to the next line.

Example :

class MyClass {
  static void sayHello() {
    System.out.println(“Hello World!”);
  }
  public static void main(String[ ] args) {
    sayHello();

    sayHello();
  }
}
// Hello World!

// Hello World!

Java Method Parameters:

You can also create a method that takes some data, called parameters, along with it when you call it. Write parameters within the method’s parentheses.

Example :

class MyClass {
  static void sayHello(String name) {
    System.out.println(“Hello ” + name);
  }
  public static void main(String[ ] args) {
    sayHello(“David”);
    sayHello(“Amy”);
  }
}
// Hello David
// Hello Amy

The Return Type:

The return keyword can be used in methods to return a value.

Example :

                class MyClass {
static int sum(int val1, int val2) {
  return val1 + val2;
}
  public static void main(String[ ] args) {
    int x = sum(2, 5);
    System.out.println(x);
  }
}
// Outputs “7”

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