JAVA PROGRAM • LEVEL 10 — INHERITANCE & POLYMORPHISM
Override an Instance Method in Java
Learn override an instance method in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
Student
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
class Person { String role(){return "Person";} } class Student extends Person { @Override String role(){return "Student";} }
class Main { public static void main(String[] args){System.out.println(new Student().role());} }CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
Student
PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for override an instance method in java.
- Create the required object and apply @Override and Runtime polymorphism to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates @Override and Runtime polymorphism 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.