015-003-003

Downcasting: From Superclass to Subclass

Medium

Problem Description

Downcasting: From Superclass to Subclass

Learning Objective: Understand explicit casting (downcasting) from superclass type variable to subclass type

Overview

Downcast a Dog instance stored in Animal type variable to call Dog-specific methods.

Specifications

Animal class: speak() method outputs "Animal speaks"
Dog class: extends Animal, overrides speak() to output "Dog barks"
Dog-specific method: fetch() outputs "Dog fetches ball"
Type check with instanceof before downcasting

Input

No input

Output Format

Dog barks
Dog fetches ball

Test Cases

※ Output examples follow programming industry standards

Input:

Expected Output:

Dog barks
Dog fetches ball

❌ Some tests failed

❌ エラー発生

Your Solution

Current Mode:● My Code

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // Write your code here

    sc.close();
  }
}

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