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:
- the method of drawing the square,
- square coloring method
Syntax:
returnType my_method_Name() {
// method body
}
// 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
} }
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:
The result of multiplying the two numbers is: 216
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: // 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);
}
}
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;
}
...
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:
Output: Squared value of 10 is: 100
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);
}
}
// 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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