20 Jul Java Methods

A method is an organized block of reusable code, that avoids repeating the tasks again and again. If you want to do a task repeatedly in a code, then just make a method, set the task in it, and call the method multiple times whenever you need it. Methods are also known as Functions.

Create and call a Method

To create a function in Java, set the name of the function followed by parentheses. Our method is demoMethod():

public static void demoMethod() {
  // write the code
}

A function in Java gets executed when it is called:

demoMethod()

Let us now see an example of creating a method in Java:

class Studyopedia {
  // Demo method
  static void demoMethod() {
    System.out.println("This is a demo method in Java");
  }

  public static void main(String[] args) {
    // Calling the method
    demoMethod();
  }
}

Output

This is a demo method in Java

Method Declaration and Definition

In the above example, we saw how to create and call a method in Java. We defined and declared the method as well:

public static void demoMethod() { // method declaration
  // method definition
}

A method in Java gets executed when it is called:

demoMethod()

Method Parameters

Set the parameters in a Java method after the name of the method. For example:

static void demoMethod(int rank) { }

To call a method with a parameter, set the value of the variable while calling, for example:

demoMethod(5)

Therefore, we have passed the rank with the value 5 while calling above.

Let us now see an example of creating a Method and passing a parameter:

class Studyopedia {
  // Demo method
  static void demoMethod(int rank) {
    System.out.println("Rank = "+rank);
  }

  public static void main(String[] args) {
    // Calling the method
    demoMethod(5);
  }
}

Output

Rank = 5

Multiple Parameters

We can also set more than one parameter in a function in Java. For example:

static void demoMethod(string player, int rank, int points)

To call a function with multiple parameters, set the value of the variable while calling, for example:

static void demoMethod("Amit", 1, 95)

We have passed the following multiple parameters while calling above:

• player: Amit
• rank: 1
• points: 95

Let us now see an example of creating a Method and passing multiple parameters:

class Studyopedia {

  // Demo method with multiple parameters
  static void demoMethod(String player, int rank, int points) {
    System.out.println("Player = "+player);
    System.out.println("Rank = "+rank);
    System.out.println("Points = "+points);
  }

  public static void main(String[] args) {
    // Calling the method
    demoMethod("Amit", 1, 95);
    demoMethod("Jack", 2, 85);
    demoMethod("John", 3, 80);
  }
}

Output

Player = Amit
Rank = 1
Points = 95
Player = Jack
Rank = 2
Points = 85
Player = John
Rank = 3
Points = 80

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