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java intermediate

Curriculum Index

Current LevelInitiate
0/ 500 XP
Gravit Certificate:
100% Required
  • 1.1 Dynamic Method Dispatch & Overriding
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Module 1: Polymorphism, Interfaces & Abstract Classes•Lesson 1

1.1 Dynamic Method Dispatch & Overriding

### Runtime Polymorphism
When an overridden method is invoked through a superclass reference, Java determines which implementation to call at runtime based on the actual object type:

Main.javaJava 15
interface Service {
    String execute();
}
class BillingService implements Service {
    public String execute() { return "BILLING_PROCESSED"; }
}
Java 15
•
Interactive Challenge
+80 XP
Challenge Objective

Execute runtime dispatch and print 'CARD_OK'.

solution.java
UTF-84 SpacesAuto-saved
openjdk-vm:~/workspace
CPython 3.11.8 (WASM)
$javac Main.java && java Main
Click "Compile & Run" (or press Ctrl + Enter) to compile AST, verify bytecode, and execute the solution.