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Java Methods


Java Tutorial » Java Methods

A method is a block of code that performs a specific task.

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

Suppose we have to create a program to draw a square and color it. You can create two methods to solve this problem:

  1. the method of drawing the square,
  2. square coloring method

Syntax:

returnType my_method_Name() {
// method body
}


Create a Method, example


A method is declared within a class and defined with name of the method, followed by "()" (parentheses without quotes)

Java programs provides some pre-defined methods, like System.out.println(), but you can create your own methods to perform actions

Example: method inside Main
public class Main {
static void my_Method() {
// code java to be executed
} }


Calling Method example

In the next example, we have declared a method named multiplication() and to use this method, we need to call it.

Example:
public class Main {

// create a method
public int multiplication(int x, int y) {
int multiplication = x * y;
// return value
return multiplication;
}

public static void main(String[] args) {

int my_num1 = 12;
int my_num2 = 18;

// create an object of Main
Main obj = new Main();
// calling method
int result = obj.multiplication(my_num1, my_num2);
System.out.println("The result of multiplying the two numbers is: " + result);
}
}
Output:
The result of multiplying the two numbers is: 216


Java Method Return Type

A Java method may or may not return a value to the function call. We use the return statement to return any value.

Example:
int add_Numbers() {
...
return sum;
}

Here, we are returning the variable sum. Since the return type of the function is int. The sum variable should be of int type. Otherwise, it will generate an error.

Example:
class Main {

// create a method
public static int square(int num) {

// return statement
return num * num;

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

// call the method
// store returned value to result
result = square(10);

System.out.println("Squared value of 10 is: " + result);
}
}

Output: Squared value of 10 is: 100




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Java Methods - java

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