カンマ区切りで渡された引数を配列に

Csv2array.java

public class Csv2array {
	public static void main(String[] args) {
		if (args.length < 1) {
			System.out.println("Usage: java -jar Csv2array.jar [username(comma separated username)]");
			System.exit(-1);
		}

		String[] split = args[0].split(",");
		String[] usernameArray = new String[split.length];
		for (int i = 0; i < usernameArray.length; i++) {
			usernameArray[i] = split[i];
		}
		
		/* ここでusernameArrayを使った処理 */
		
	}
}