Object Oriented Programming - JAVA- Casting
Object Oriented Programming - JAVA👽
Casting ......
We use casting to catch a class using another class. So in this blog we discuss about Casting.
What's going on in Casting ? In casting, we have to inherit classes.
Let's see an example.
int x = 5 ; Integer variables have 32 bits.
long y = 6 ; Long variables have 64 bits.
x = y ; ✖ We can't catch long variable using integer variable.
y = x ; ✔ We can catch integer variable using long variable.
There are two types of casting.
- Upcasting
- Downcasting
Upcasting
Upcasting is a process of assign subclass object to superclass variable that is reference of superclass.
class Parent {
//code
}
class Child extends Parent {
//code
}
class Test {
Parent p = new Child();
}
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Downcasting
Downcasting is a process of converting subclass object assigned to a variable with a subclass reference back into a subclass variable.
class Parent {
//code
}
class Child extends Parent {
//code
}
class Test {
Parent p = new Child();
Child c = (Child) p ;
}
We can downcasting only when we done upcasting process.
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