Java - Class Method Definition

What is a method?

A method defines the behavior of the objects or class itself.

A method is a named block of code.

A method may accept input values from the caller and it may return a value to the caller.

The list of input values is called parameters.

A method may have zero parameters.

A method is defined inside the body of a class.

Syntax

The general syntax for a method declaration is of the form

<modifiers> <return type> methodName (parameters list) <throws clause> {
    // Body of the method
}

Item	Meaning
<modifiers>	an optional list of modifiers
<return type>	data type of the value returned from the method
methodName	the name of the method.

Example

The following is an example of a method: it is named add.

It takes two parameters of type int named n1 and n2, and it returns their sum:

int add(int n1, int n2) {
   int sum = n1 + n2;
   return sum;
}

To call your add method, you need to use the following statement:

add(10, 12);

Demo

public class Main {
  public static void main(String[] args) {
    System.out.println(add(2, 4));
    System.out.println(add(3, 4));
    System.out.println(add(4, 4));
    System.out.println(add(5, 4));
  }//  w  w  w .  ja  va2  s.com

  static int add(int n1, int n2) {
    int sum = n1 + n2;
    return sum;
  }
}

Result

Related Topics

• calculate Factorial
• Print with Recursion
• Calculate factorial using recursive method
• Recursion Power function
• Use recursive function to sum numbers

Exercise

• Write code to Check that the given CharSequence is neither null nor of length 0.
• Write code to create a method check if a string is Not Blank
• Write code to check if a string has Blank space
• Write code to find difference between two string
• Write code to delete Whitespace from a string
• Write code to count Matches in a string
• Write code to get Extension from File path String
• Write code to return Last Word from a sentence
• Write code to remove Non Digits from a string
• Write code to create a function to convert object to String and handle null value
• Write code to Capitalize the first letter in the passed string

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