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Method overloading and constructor overloading in JAVA

Muhammed Noufal V Tmuhammednoufalvt@gmail.co

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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.

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.

• Overloading methods demonstrate the concept of polymorphism.

• 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.

Example• public class example_1 { int n1; int n2; example_1() { n1 = 10; n2 = 20; } void square() { System.out.println("The Square is " + n1 * n2); } void square(int p1) { n1 = p1; System.out.println("The Square is " + n1 *

n2); }

void square(int p1, int p2) { n1 = p1; n2 = p2; System.out.println("The Square is " +

n1 * n2); } public static void main(String args[]) { example_1 obj1 = new example_1(); obj1.square();

obj1.square(4); obj1.square(7,8);

}}

Constructor• Special type of method • A constructor initialize an object

immediately upon creation • Name of constructor must be same

as name of Class• Once defined, the constructor is

automatically called immediately after the object is created before the new operator compleates

• They do not specify any return type not even void

Constructor Overloading

• Constructors are methods that can be overloaded, just like any other method in a class.

• Constructors having the same name with different parameter list is called constructor overloading.

Exampleclass Point{ int x; int y; Point(int a, int b) { x = a; y = b; } }class Circle{ int originX; int originY; int radius; Circle() { originX = 5; originY = 5; radius = 3; } Circle(int x1, int y1, int r) { originX = x1; originY = y1; radius = r; }

Circle(Point p, int r) { originX = p.x; originY = p.y; radius = r; } void display() { System.out.println("--Center at " + originX

+ " and " + originY); System.out.println("Radius = " + radius); } public static void main(String args[]) { Circle c1 = new Circle(); Circle c2 = new Circle(10,20,5); Circle c3 = new Circle(new Point(15,25),10); c1.display(); c2.display(); c3.display(); } }

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