Method bad

chapter24/src/test/java/com/seaofnodes/simple/Simple.java:67–71

(String err)

    static void bad_usage() { bad("Invalid usage (use --help)"); }
    static RuntimeException bad(String err) {
        System.err.println("ERROR: "+err);
        System.exit(1);
        return new RuntimeException(err);
    }

    static void target() {
        System.out.print(TestC.CPU_PORT);