![6
In this example, we have created two overloaded methods, first sum method performs
addition of two numbers and second sum method performs addition of three numbers.
class Morning
{
public void sum(int a, int b)
{
System.out.println(a+b);
}
public void sum(int a,int b,int c)
{
System.out.println(a+b+c);
}
public static void main(String args[])
{
Morning h=new Morning();
h.sum(10,20);
h.sum(10,20,30);
System.out.println("Hello Java");
}
}](https://image.slidesharecdn.com/introductiontomethodoverloadingmethodoverridinginjavahdm-160725113607/85/Introduction-to-method-overloading-amp-method-overriding-in-java-hdm-6-320.jpg)
![7
In this example, we have created two overloaded methods that differs in data type. The
first sum method receives two integer arguments and second sum method receives two
double arguments.
class hello
{
public void sum(int a, int b)
{
System.out.println(a+b);
}
public void sum(double a, double b)
{
System.out.println(a+b);
}
public static void main(String args[])
{
hello h=new hello();
h.sum(10,20);
h.sum(10.20, 30.50);
System.out.println("Hello Java");
}
}](https://image.slidesharecdn.com/introductiontomethodoverloadingmethodoverridinginjavahdm-160725113607/85/Introduction-to-method-overloading-amp-method-overriding-in-java-hdm-7-320.jpg)
![9
Example of method overriding
In this example, we have defined the display method in the subclass as defined in the parent class but it has some
specific implementation.
class Parent
{
int a=50;
public void display()
{
System.out.println("Display method of Parent class");
}
}
class Child extends Parent
{
int b=100;
public void display()
{
System.out.println("Display method of Child class");
}
}
class MethodOverriding
{
public static void main(String args[])
{
Child d=new Child();
d.display();
}
}](https://image.slidesharecdn.com/introductiontomethodoverloadingmethodoverridinginjavahdm-160725113607/85/Introduction-to-method-overloading-amp-method-overriding-in-java-hdm-9-320.jpg)
![9
Example of method overriding
In this example, we have defined the display method in the subclass as defined in the parent class but it has some
specific implementation.
class Parent
{
int a=50;
public void display()
{
System.out.println("Display method of Parent class");
}
}
class Child extends Parent
{
int b=100;
public void display()
{
System.out.println("Display method of Child class");
}
}
class MethodOverriding
{
public static void main(String args[])
{
Child d=new Child();
d.display();
}
}](https://image.slidesharecdn.com/introductiontomethodoverloadingmethodoverridinginjavahdm-160725113607/85/Introduction-to-method-overloading-amp-method-overriding-in-java-hdm-10-320.jpg)
Introduction to method overloading & method overriding in java hdm
- 1. Introduction to Method Overloading & Method Overriding in Java Harshal Misalkar
- 2. 2 Introduction Polymorphism poly=many morphism=forms i.e one interface having many methods. Polymorphism simply means many forms. It can be defined as one thing performing different forms.
- 4. 4 Following concepts demonstrate different types of polymorphism 1) Method Overloading 2) Method Overriding If a class have multiple methods by same name but different parameters, it is known as Method Overloading. If we have to perform only one operation, having same name of the methods increases the readability of the program.
- 5. 5 Advantage of method overloading Method overloading increases the readability of the program. Different ways to overload the method By changing number of arguments. By changing the data type. .
- 6. 6 In this example, we have created two overloaded methods, first sum method performs addition of two numbers and second sum method performs addition of three numbers. class Morning { public void sum(int a, int b) { System.out.println(a+b); } public void sum(int a,int b,int c) { System.out.println(a+b+c); } public static void main(String args[]) { Morning h=new Morning(); h.sum(10,20); h.sum(10,20,30); System.out.println("Hello Java"); } }
- 7. 7 In this example, we have created two overloaded methods that differs in data type. The first sum method receives two integer arguments and second sum method receives two double arguments. class hello { public void sum(int a, int b) { System.out.println(a+b); } public void sum(double a, double b) { System.out.println(a+b); } public static void main(String args[]) { hello h=new hello(); h.sum(10,20); h.sum(10.20, 30.50); System.out.println("Hello Java"); } }
- 8. 8 Method Overriding in Java If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in java. In other words, If subclass provides the specific implementation of the method that has been provided by one of its parent class, it is known as method overriding. Usage of Java Method Overriding Method overriding is used to provide specific implementation of a method that is already provided by its super class. Method overriding is used for runtime polymorphism Rules for Java Method Overriding method must have same name as in the parent class method must have same parameter as in the parent class.
- 9. 9 Example of method overriding In this example, we have defined the display method in the subclass as defined in the parent class but it has some specific implementation. class Parent { int a=50; public void display() { System.out.println("Display method of Parent class"); } } class Child extends Parent { int b=100; public void display() { System.out.println("Display method of Child class"); } } class MethodOverriding { public static void main(String args[]) { Child d=new Child(); d.display(); } }
- 10. 9 Example of method overriding In this example, we have defined the display method in the subclass as defined in the parent class but it has some specific implementation. class Parent { int a=50; public void display() { System.out.println("Display method of Parent class"); } } class Child extends Parent { int b=100; public void display() { System.out.println("Display method of Child class"); } } class MethodOverriding { public static void main(String args[]) { Child d=new Child(); d.display(); } }
Editor's Notes
- #2: First Class: Introduction, Prerequisites, Advices, Syllabus Lab 1: Create a Java Project, Compile, and Run. Show syntax errors Print program Capture screen shots, and save it in Word, and print it. Homework One: Check in the class randomly.