JAVA PROGRAM • LEVEL 11 — ABSTRACTION, INTERFACES & TYPE DESIGN
Create a Sealed Type Hierarchy in Java
Learn create a sealed type hierarchy in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
Saved
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
sealed interface Result permits Success,Failure {} record Success(String value) implements Result {} record Failure(String reason) implements Result {}
class Main { public static void main(String[] args){Result result=new Success("Saved");System.out.println(result instanceof Success s?s.value():"Failed");} }CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
No line selected
EXPECTED OUTPUT FOR THE SAMPLE
Saved
PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for create a sealed type hierarchy in java.
- Create the required object and apply sealed interface and permits to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates sealed interface and permits 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.
Use sealed interface with compatible Java types; Java checks types and method signatures at compile time.
Java is case-sensitive, and every statement that requires a semicolon must end with one.