what is polymorphism
The word polymorphism means having many forms. In simple words, we can define polymorphism as the ability of a message to be displayed in more than one form. Real life example of polymorphism: A person at the same time can have different characteristic. Like a man at the same time is a father, a husband, an employee.what is polymorphism
POLYMORPHISM: It is an ability of object to behave in multiple
form. The most common use of polymorphism is Java, when a
parent class reference type of variable is used to refer to a child
class object.
In my framework
E.g.: WebDriver driver = new ChromeDriver();
We use method overloading and overriding to achieve
Polymorphism.
There are two types of achieving Polymorphism
Upcasting & Downcasting
Upcasting is casting a subtype to a supertype,
going up in the inheritance tree.
It is done implicitly
in order to use method available on any
interface/class, the object should be of
same class or of class implementing the interface.
WebDriver driver = new ChromeDriver();
or
TakeScreenShot ts = new ChromeDriver();
Downcasting is casting to a subtype,
going down in the inheritance tree.
It is done to access sub class features.
It has to be done manually
ChromeDriver driver = (ChromeDriver)Webdriver;what is runtime polymorphism
Runtime polymorphism is a process of which take
cares the overriding method at run time
rather than compile time.
In method overriding,
a subclass overrides a method with the same
signature as that of in its superclass.
During compile time, the check is made
on the reference type. But, in the runtime,
JVM figures out the object type and would
run the method that belongs to
that particular object.Compile time polymorphism
// In this program, we will see how multiple functions are created with the same name,
// but the compiler decides which function to call easily at the compile time itself.
class CompileTimePolymorphism{
// 1st method with name add
public int add(int x, int y){
return x+y;
}
// 2nd method with name add
public int add(int x, int y, int z){
return x+y+z;
}
// 3rd method with name add
public int add(double x, int y){
return (int)x+y;
}
// 4th method with name add
public int add(int x, double y){
return x+(int)y;
}
}
class Test{
public static void main(String[] args){
CompileTimePolymorphism demo=new CompileTimePolymorphism();
// In the below statement, the Compiler looks at the argument types and decides to call method 1
System.out.println(demo.add(2,3));
// Similarly, in the below statement, the compiler calls method 2
System.out.println(demo.add(2,3,4));
// Similarly, in the below statement, the compiler calls method 4
System.out.println(demo.add(2,3.4));
// Similarly, in the below statement, the compiler calls method 3
System.out.println(demo.add(2.5,3));
}
}Copyright © 2021 Codeinu
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