Java OOP

Downcasting

class Animal {}
 
class Dog3 extends Animal {
    static void method(Animal a) {
        if (a instanceof Dog3) {
            Dog3 d = (Dog3) a; //downcasting  
            System.out.println("ok downcasting performed");
        }
    }
 
    public static void main(String[] args) {
        Animal a = new Dog3();
        Dog3.method(a);
    }
}

Keyword

Transient

The transient keyword in Java is used to indicate that a field should not be part of the serialization (which means saved, like to a file) process.

@Override

When the method signature (name and parameters) are the same in the superclass and the child class, it’s called overriding.

@Overload

When two or more methods in the same class have the same name but different parameters, it’s called overloading.