Challenge 1: A Two-Line Greeting Program — Possible Solution
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Greeting.java:

public class Greeting {
    public static void main(String[] args) {
        System.out.println("Hello there!");
        System.out.println("Welcome to Java.");
    }
}

$ javac Greeting.java
$ java Greeting

Output:

    Hello there!
    Welcome to Java.

WHY THIS WORKS AS AN ANSWER
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The public class is named Greeting, matching the filename Greeting.java
exactly, per the chapter's own compiler-enforced rule. Two separate
System.out.println calls each print their own line, and javac/java
follow the chapter's own two-step compile-then-run-on-a-VM workflow.