README.md

ReadingBat Java Content

Java and Kotlin programming challenges for the ReadingBat platform. This repository defines challenge content that the ReadingBat server renders as interactive coding exercises.

Getting Started

Requires JDK 17+.

./gradlew build -x test        # Compile
./gradlew run                   # Start the content server on http://localhost:8080
./gradlew --rerun-tasks check   # Run all tests

Challenge Structure

Each challenge is a standalone source file with a main() that prints expected outputs. Those output lines become the answer key for the exercise.

Java (src/main/java/<package>/):

// @desc Determine if one value is less than another with the **<** operator.
public class LessThan {
    public static boolean compare(int val1, int val2) {
        return val1 < val2;
    }
    public static void main(String[] args) {
        System.out.println(compare(4, 6));   // true
        System.out.println(compare(12, 8));  // false
    }
}

Kotlin (src/main/kotlin/<package>/):

fun doubleIt(i: Int): Int = i * 2

fun main() {
    println(doubleIt(5))   // 10
    println(doubleIt(10))  // 20
}

All challenges are registered in src/main/kotlin/Content.kt using the readingBatContent DSL.