java/03-count/Count.java


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public class Count {
    public static void main(String[] args) {
	if (args.length < 2) {
	    System.err.println("[ERROR] Type two integers as arguments.");
	    System.exit(1);
	}

	int start = 0;
	int end = 0;
	
	try {
	    start = Integer.parseInt(args[0]);
	    end = Integer.parseInt(args[1]);
	} catch(NumberFormatException nfe) {
            System.err.println("[ERROR] You didn't provide integer arguments.");
	    //System.err.println("Details: " + nfe.getMessage());
	    System.exit(2);
	}

	if(start > end) {
	    System.err.println("[ERROR] Start is greater than end.");
	    System.exit(3);
	}

        for(int i = start; i <= end; i++) {
            System.out.println(i);
	}
    }
}