Update HelloApp.java

[HarryDebugs]

No description provided.

[Copilot]

Pull request overview

Updates the HelloApp entrypoint to handle command-line arguments more flexibly by greeting all provided names instead of only the first one.

Changes:

• Inverts the argument check to explicitly handle the no-args case first (args.length == 0).
• Builds a comma-separated list from all command-line arguments and prints a combined greeting.

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[Copilot]

The manual StringBuilder + first flag loop is more verbose than necessary for joining arguments. Consider using String.join(", ", args) (if targeting Java 8+) to simplify and reduce branching.

Suggested change

	StringBuilder nameBuilder = new StringBuilder();
	boolean first = true;
	for (String name : args) {
	if (!first) {
	nameBuilder.append(", ");
	}
	nameBuilder.append(name);
	first = false;
	}
	System.out.println("Hello, " + nameBuilder.toString() + "!");
	String joinedNames = String.join(", ", args);
	System.out.println("Hello, " + joinedNames + "!");

[Copilot]

nameBuilder.toString() is redundant here because string concatenation will call toString() implicitly. Using nameBuilder directly avoids the extra call and is a bit clearer.

Suggested change

	System.out.println("Hello, " + nameBuilder.toString() + "!");
	System.out.println("Hello, " + nameBuilder + "!");

[Copilot]

There appears to be trailing whitespace on this blank line; please remove it to keep diffs clean and avoid lint/formatting noise.

[Copilot]

There appears to be trailing whitespace on this blank line; please remove it to keep diffs clean and avoid lint/formatting noise.