10. Hierarchical Inheritance: Type Checking

Scenario

Multiple classes inherit from the same parent. How do we distinguish between them at runtime?

Code Block

class Account {
    void info() { System.out.println("Basic Account"); }
}

class SavingsAccount extends Account {
    void interest() { System.out.println("5% Interest"); }
}

class CurrentAccount extends Account {
    void overdraft() { System.out.println("Overdraft enabled"); }
}

public class Main {
    public static void main(String[] args) {
        Account[] accounts = { new SavingsAccount(), new CurrentAccount() };
        
        for (Account acc : accounts) {
            if (acc instanceof SavingsAccount) {
                ((SavingsAccount) acc).interest();
            } else if (acc instanceof CurrentAccount) {
                ((CurrentAccount) acc).overdraft();
            }
        }
    }
}

Take Your Shot

Predicted Output

Type exactly what you think will be printed in the console.