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java downcasting

Sourodipa Sur answered on September 18, 2022 Popularity 3/10 Helpfulness 2/10

answer java downcasting

related java upcasting downcasting

java downcasting

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class Animal {
    void eat() {
        System.out.println("Animal is eating");
    }
}

class Dog extends Animal {
    void bark() {
        System.out.println("Dog is barking");
    }
}

public class Example {
    public static void main(String[] args) {
        Animal myAnimal = new Dog();
        
        // Downcasting requires explicit casting and may throw a ClassCastException
        if (myAnimal instanceof Dog) {
            Dog myDog = (Dog) myAnimal;
            myDog.eat(); // Accessing the base class method
            myDog.bark(); // Accessing the derived class method
        }
    }
}

Popularity 3/10 Helpfulness 2/10 Language java

Source: chat.openai.com

Tags: java

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Contributed on Mar 05 2024

Sourodipa Sur

0 Answers Avg Quality 2/10

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java upcasting downcasting

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// reference primitive, and its type
SportsCar sc = new SportsCar();
Car c = sc;         // upcasting is implicit, this is OK!
sc.race();          // sc type is SportsCar, this is OK!
c.race();           // c type is Car, will NOT compile!

// Upcasting is implicit
Car myCar = new SportsCar();    // upcasting
Car myCar = sc;					// upcasting is implicit
Car myCar = (Car) sc;       // (Car) is not necessary

// Downcasting is explicit
// potential ClassCastingException
// b/c Java will not always be able to determine that you've specified the right types at compile time
// So if you make a mistake you may encounter a run time error - hence Generics. 
SportsCar mySportsCar = (SportsCar) myCar;  // potential ClassCastingException
((SportsCar) c).race();     // downcasting to allow specialized subclass methods

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: java

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Contributed on Sep 18 2022

Grotesque Gibbon

0 Answers Avg Quality 2/10

java downcasting

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