MonsterGen.java

public class MonsterGen {
    public static void print(String s) {
        System.out.println(s);
    }

    public static void usage() {
        print("Monster generator.\nUsage: java MonsterGen <num>");
        System.exit(1);
    }

    public static void main(String[] args) {
        if (args.length < 1)
            usage();

        int num = 0;
        try {
            num = Integer.parseInt(args[0]);
        } catch (Exception e) {
            System.out.println("Expects an integer");
            usage();
        }

        print("class Monster\n{");
        print("\tstatic void main (String[] args)");
        print("\t{\n\t\tSystem.out.println (new Foo().foo());");
        print("\t}\n}\n");

        print("class Foo\n{");
        print("\tpublic int foo()");
        print("\t{");
        print("\t\tint sum;\n");
        print("\n\t\tsum = 0;");
        for (int i = 0; i < num; i++)
            print("\t\tsum = sum + 1;");
        print("\t\treturn sum;");
        print("\t}");
        print("}");
        return;
    }
}