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Java Methods

  • Sometimes our program grows in size, and we want to separate the logic of the main method from the other methods.
  • For instance, if we calculate the average of a number pair 5 times, we can use methods to avoid repeating the logic. [DRY – Don’t Repeat Yourself]

  • Syntax of a Method

    A method is a function written inside a class. Since Java is an object-oriented language, we need to write the method inside some class.

    Syntax of a method :
    returnType nameOfMethod() {
    //Method body

    The following method returns the sum of two numbers
    int mySum(int a, int b) {
    	int c = a+b;
    	return c;	//Return value

  • In the above method, int is the return data type of the mySum function.

  • mySum takes two parameters: int a and int b.

  • The sum of two values integer values(a and b) is stored in another integer value named 'c'.

  • mySum returns c.

  • Calling a Method :

    A method can be called by creating an object of the class in which the method exists followed by the method call:
    Calc obj = new Calc(); //Object Creation
    obj.mySum(a , b); //Method call upon an object

    The values from the method call (a and b) are copied to the a and b of the function mySum. Thus even if we modify the values a and b inside the method, the values in the main method will not change.

    Void return type :

    When we don’t want our method to return anything, we use void as the return type.

    Static keyword :

  • The static keyword is used to associate a method of a given class with the class rather than the object.

  • You can call a static method without creating an instance of the class.

  • In Java, the main() method is static, so that JVM can call the main() method directly without allocating any extra memory for object creation.

  • All the objects share the static method in a class.

  • Process of method invocation in Java :

    Consider the method Sum of the calculate class as given in the below code :
    class calculate{
         int sum(int a,int b){
            return a+b;

    The method is called like this:
    class calculate{
         int sum(int a,int b){
            return a+b;
    public static void main(String[] args) {
            calculate obj = new calculate();
            int c = obj.sum(5,4);



  • Inside the main() method, we've created an object of the calculate class.

  • obj is the name of the calculate class.

  • Then, we've invoked the sum method and passed 5 and 4 as arguments.

  • Note: In the case of Arrays, the reference is passed. The same is the case for object passing to methods.


    public class cwh_31_methods {
        static int logic(int x, int y){
            int z;
                z = x+y;
            else {
                z = (x +y) * 5;
            x = 566;
            return z;
        public static void main(String[] args) {
            int a = 5;
            int b = 7;
            int c;
            // Method invocation using Object creation
            //cwh_31_methods obj = new cwh_31_methods();
            //c = obj.logic(a, b);
            c = logic(a, b);
            System.out.println(a + " "+ b);
            int a1 = 2;
            int b1 = 1;
            int c1;
            c1 = logic(a1, b1);


    5 7


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