JAVA PROGRAM • LEVEL 10 — INHERITANCE & POLYMORPHISM
Use a Parent Reference in Java
Learn use a parent reference in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
Bark
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
class Animal { String sound(){return "?";} } class Dog extends Animal { String sound(){return "Bark";} }
class Main { public static void main(String[] args){Animal animal=new Dog();System.out.println(animal.sound());} }CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
Bark
PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for use a parent reference in java.
- Create the required object and apply Upcasting and Dynamic dispatch to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates Upcasting and Dynamic dispatch through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.
EFFICIENCY
Time and space complexity
O(1)
O(1)
DEBUGGING CHECKLIST
Common mistakes
Keep the class name Main and the entry method signature public static void main(String[] args) when using the online compiler.
Create an object before accessing instance members; static members can be accessed through the class name.
Java is case-sensitive, and every statement that requires a semicolon must end with one.