Method Overloading in Java

Aug 3, 2017Download as pptx, pdf3 likes2,030 views

From this slide you can know about - Signature - Polymorphism -Method -Types of Method - Method Overloading - Sample programme - Reference Books & websites name I hope, it is beneficial for beginner Java learner. It's just a simple overview of the topic Method Overloading in Java.

Presented By
Name- Sonya Akter Rupa
ID- 315161009
Batch- 8th
Semester- 5th
Department of CSE
Email- sonyarupa321@gmail.com
Hamdard University
Bangladesh
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa
Presentation on
Method Overloading in Java

Outline
What is signature?
What is Polymorphism?
What is Method?
Method Overloading
Why overload a method?
Example of Method Overloading
Reference Books & Websites
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 2

What is signature?
In any programming language, a signature is what distinguishes
one function or method from another
In C, every function has to have a different name
In Java, two methods have to differ in their names or in the
number or types of their parameters
Same name(int i) and (int i, int j) are different
Same name(int i) and (int k) are the same
Same name(int i, double d) and (double d, int i) are different
In C++, the signature also includes the return type
But not in Java!
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 3

What is Polymorphism?
Polymorphism means many (poly) shapes (morph)
In Java, polymorphism refers to the fact that we can
multiple methods with the same name in the same class
There are two kinds of polymorphism:
i. Overloading
◦ Two or more methods with different signatures
ii. Overriding
◦ Replacing an inherited method with another having the same signature
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 4

What is Method?
 A Java method is a collection of
statements that are grouped together to
perform an operation.
A class can contain any number of methods.
Methods can be with parameter and without
parameter.
The parameter in a method are called type
signature.
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 5

Method Overloading
Two or more methods within the same class that
share the same name, but with different parameter
declarations (type signatures).
The process is referred to as method overloading.
Overloaded methods may have different return
types.
When java encounters a call to an overloaded
method, it simply executes the version of the
method whose parameters match the arguments
used in the call.
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 6

Why overload a method?
So we can use the same names for methods that do essentially the same thing
Example: println(int), println(double), println(boolean), println(String), etc.
So we can supply defaults for the parameters:
int increment(int amount) {
count = count + amount;
return count;
}
int increment() {
return increment(1);
}
Notice that one method can call another of the same name
So we can supply additional information:
void printResults() {
System.out.println("total = " + total + ", average = " + average);
}
void printResult(String message) {
System.out.println(message + ": ");
printResults();
}
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 7

Example
class Test {
public static void main(String args[]) {
myPrint(5);
myPrint(5.0);
}
static void myPrint(int i) {
System.out.println("int i = " + i);
}
static void myPrint(double d) { // same name, different parameters
System.out.println("double d = " + d);
}
}
int i = 5
double d = 5.0
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 8

Reference Books & Websites
JAVA The Complete Reference by Herbert Schild
en.wikipedia.org/wiki/method
en.wikipedia.org/wiki/method_overloading
www.quora.com/reason-of-method-overloading
Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 9

Thursday, August 3, 2017 Prepered By Sonya Akter Rupa

This document discusses method overloading in Java. It defines a method as a collection of statements that perform an operation. A method has a header specifying its modifiers, return type, name, and parameters. The body contains the statements. Method overloading allows multiple methods with the same name but different signatures. Signatures can vary by parameter types, numbers, or orders. Overloaded methods use static binding at compile time. The example shows two Addition methods differentiated by an extra parameter, with the correct one called based on arguments.

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Method Overloading in Java

1. Presented By Name- Sonya Akter Rupa ID- 315161009 Batch- 8th Semester- 5th Department of CSE Email- sonyarupa321@gmail.com Hamdard University Bangladesh Thursday, August 3, 2017 Prepered By Sonya Akter Rupa Presentation on Method Overloading in Java

2. Outline What is signature? What is Polymorphism? What is Method? Method Overloading Why overload a method? Example of Method Overloading Reference Books & Websites Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 2

3. What is signature? In any programming language, a signature is what distinguishes one function or method from another In C, every function has to have a different name In Java, two methods have to differ in their names or in the number or types of their parameters Same name(int i) and (int i, int j) are different Same name(int i) and (int k) are the same Same name(int i, double d) and (double d, int i) are different In C++, the signature also includes the return type But not in Java! Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 3

4. What is Polymorphism? Polymorphism means many (poly) shapes (morph) In Java, polymorphism refers to the fact that we can multiple methods with the same name in the same class There are two kinds of polymorphism: i. Overloading ◦ Two or more methods with different signatures ii. Overriding ◦ Replacing an inherited method with another having the same signature Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 4

5. What is Method?  A Java method is a collection of statements that are grouped together to perform an operation. A class can contain any number of methods. Methods can be with parameter and without parameter. The parameter in a method are called type signature. Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 5

6. Method Overloading Two or more methods within the same class that share the same name, but with different parameter declarations (type signatures). The process is referred to as method overloading. Overloaded methods may have different return types. When java encounters a call to an overloaded method, it simply executes the version of the method whose parameters match the arguments used in the call. Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 6

7. Why overload a method? So we can use the same names for methods that do essentially the same thing Example: println(int), println(double), println(boolean), println(String), etc. So we can supply defaults for the parameters: int increment(int amount) { count = count + amount; return count; } int increment() { return increment(1); } Notice that one method can call another of the same name So we can supply additional information: void printResults() { System.out.println("total = " + total + ", average = " + average); } void printResult(String message) { System.out.println(message + ": "); printResults(); } Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 7

8. Example class Test { public static void main(String args[]) { myPrint(5); myPrint(5.0); } static void myPrint(int i) { System.out.println("int i = " + i); } static void myPrint(double d) { // same name, different parameters System.out.println("double d = " + d); } } int i = 5 double d = 5.0 Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 8

9. Reference Books & Websites JAVA The Complete Reference by Herbert Schild en.wikipedia.org/wiki/method en.wikipedia.org/wiki/method_overloading www.quora.com/reason-of-method-overloading Thursday, August 3, 2017 Prepered By Sonya Akter Rupa 9

10. Thursday, August 3, 2017 Prepered By Sonya Akter Rupa

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