No Overload Method for Read Takes 3 Arguments

What is the difference between Method Overloading And Overriding?

Last updated on Jun 10,2021 40.2K Views

25 / 72 Weblog from Coffee Core Concepts

Java programming language is the all-time choice when it comes to object-oriented programming. With concepts like classes, objects, Inheritance, Polymorphism, etc, it becomes extremely easy to piece of work with Java. Ease of admission and easy syntax makes the code efficient and less circuitous as well. In this article, we volition acquire most method overloading and overriding in Java. Following are the topics discussed in this web log:

• What is Method Overloading in Java?
• Why Method Overloading?
• Method Overloading Examples
• What is Method Overriding?
• Rules For Method Overriding
• Method Overriding Example
• Overloading vs Overriding: Differences between Method Overload and Method overriding

What is Method Overloading in Coffee?

Method overloading allows the method to have the aforementioned proper name which differs on the basis of arguments or the argument types. It can be related to compile-time polymorphism. Following are a few pointers that nosotros have to keep in mind while overloading methods in Java.

• We cannot overload a return type.

• Although we can overload static methods, the arguments or input parameters have to be unlike.

• We cannot overload two methods if they only differ by a static keyword.

• Like other static methods, the main() method can also be overloaded.

Let's take a expect at a unproblematic program to understand how method overloading works in python.

public course Div{ public int div(int a , int b){          return (a / b); }  public int div(int a , int b , int c){          return ((a + b ) / c); }  public static void principal(String args[]){ Div ob = new Div(); ob.div(10 , 2); ob.div(10, 2 , three); } }        

          Output:          five           4

In the to a higher place program, we have two methods with the aforementioned proper name only different parameters. This is how the method overloading works in Java.

Why Method Overloading?

The main advantage of using method overloading in Java is that it gives us the freedom to non ascertain a part over again and over again for doing the same matter. In the below case, the two methods are basically performing division, so we can take different methods with the same name but with different parameters. It likewise helps in compile-time polymorphism.

Overloading the chief() method:

Following is an example to overload the main() method in java.

public grade Edureka{ public static void main(String[] args){ Arrangement.out.println("how-do-you-do"); Edureka.main("edurekan"); }  public static void chief(String arg1){ System.out.println(" welcome" + arg1); Edureka.main("welcome" , "to edureka"); }  public static void chief(Cord arg1 , String arg2){ System.out.println("hello" , +arg1 , +arg2); } }        

          Output:          hello welcome edurekan         hi, welcome to edureka

Method Overloading Examples

• Programme to overload static methods in java.

public course Test{ public static int func(int a ){        render 100; } public static char func(int a , int b){       return "edureka"; } public static void main(String args[]){ System.out.println(func(1)); Organization.out.println(func(1,3)); } }        

          Output:100         edureka

• Program to overload three methods with the same name.

public class Add{ public int add together(int a , int b){        return (a + b); } public int add(int a , int b , int c){        render (a + b + c) ; } public double add together(double a , double b){        render (a + b); } public static void primary( String args[]){ Add together ob = new Add together(); ob.add(15,25); ob.add(15,25,35); ob.add(11.5 , 22.5); } }        

          Output:forty         75         34

What Is Method Overriding in Coffee?

Inheritance in java involves a relationship betwixt parent and child classes. Whenever both the classes contain methods with the same name and arguments or parameters information technology is sure that one of the methods volition override the other method during execution. The method that will be executed depends on the object.

If the child class object calls the method, the child class method will override the parent class method. Otherwise, if the parent class object calls the method, the parent grade method will exist executed.

Method overriding too helps in implementing runtime polymorphism in coffee. Let'due south take a simple example to sympathize how method overriding works in java.

class Parent{ void view(){ System.out.println("this is a parent class method); }} grade Child extends Parent{ void view(){ System.out.println("this is a child class method); }} public static void main(String args[]){ Parent ob = new Parent(); ob.view(); Parent ob1 = new Child(); ob1.view();        

          Output:this is a kid class method

Rules For Method Overriding

• The admission modifier can only allow more access for the overridden method.

• A terminal method does not back up method overriding.

• A static method cannot be overridden.

• Private methods cannot be overridden.

• The return type of the overriding method must be the same.

• We tin can call the parent grade method in the overriding method using the super keyword.

• A constructor cannot be overridden because a child class and a parent class cannot have the constructor with the same proper noun.

Method Overriding Example

• Program to prove overriding using super keyword

grade Parent { void bear witness(){ System.out.println("parent class method"); } course Kid extends Parent { void show(){ super.show(); System.out.println("child class method"); } public static void chief(String args[]){ Parent ob = new Child(); ob.show(); } }        

          Output:parent class method         child class method

Overloading vs Overriding: Departure between Method Overloading and Method Overriding

Following are the key differences between method overloading and overriding in Java.

Method Overloading	Method Overriding
It is used to increase the readability of the program	Provides a specific implementation of the method already in the parent class
It is performed inside the same class	It involves multiple classes
Parameters must exist different in instance of overloading	Parameters must be same in example of overriding
Is an instance of compile-time polymorphism	It is an example of runtime polymorphism
Return type can be unlike only you must change the parameters as well.	Return blazon must be aforementioned in overriding
Static methods tin can exist overloaded	Overriding does non involve static methods.

In this weblog, we accept discussed method overloading and method overriding in particular. With the interest of classes, objects, and concepts like inheritance and polymorphism information technology becomes fairly important to become a clear thought of what information technology ways to overload or override methods in java.

Coffee programming language is a pinnacle in object-oriented programming and incorporates a lot of applications. With the demand and popularity, an aspiring java developer must exist proficient in the key concepts of the programming language. Enroll to Edureka's Java Certification programme to boot-start your learning.

Got a question for us? please mention this in the comments section of this article on "method overloading vs method overriding in java" and we volition become back to you as soon as possible.

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Source: https://www.edureka.co/blog/method-overloading-and-overriding-in-java/

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