Modern syntax
Test Java 17-friendly examples and compare them with older Java styles.
Modern Java Practice
Java 17 Online Compiler
Use CodingCool to run Java 17 programs online. Practice modern Java syntax, text blocks, switch expressions, records-style examples, collections, streams, and interview code in the browser.
Open Java 17 CompilerWhat can you practice with Java 17?
Interview coding
Run arrays, strings, maps, sorting, recursion, streams, and method examples.
Compiler feedback
Read Java compiler messages in the console and fix errors step by step.
Java 17 example
public class Main {
public static void main(String[] args) {
String message = """
Hello from Java 17
""";
System.out.println(message.trim());
}
}