Exporting to JAR and running in cmd

[JonnySnip3r]

Hey guys i have just created a program in eclipse to calculate UCAS points as i am going to uni this year and had nothing else to do today haha :)

Anyways one things i have never learned to do in java (btw i am a noob only been learning for a few weeks) is export as JAR and be able to run it in command prompt.

I can get the thing to run in cmd if i compile it using command prompt or in eclipse when i debug it everything works fine however when i run the finished JAR file on windows nothing happens :( do i need to import something or am i doing it wrong?

here is the source for my application.

import java.util.Scanner;
import java.io.*;

public class ucasCalc {
	public static void main(String[] args) throws IOException{
		
		int totalUCAS = 0;
		char grade;
		int counter = 0;
		int howMany; // Stores the amount of grades.
		
		char CharP = 6;
		char CharM = 12;
		char CharD = 18;
		
		System.out.print("Please enter how many grades you need me to calculate: ");
		Scanner input = new Scanner(System.in);
		howMany = input.nextInt();
		
		System.out.println("I will now calculate " + howMany);
		System.out.println("D = 18, M = 12, P = 6");
		
		while (counter < howMany) {
			System.out.print("Please enter grade (eg D,M,P): ");
			grade = input.next().charAt(0);
			
			if (grade == 'D') {
				totalUCAS = totalUCAS + CharD;
			}
			
			if (grade == 'M'){
				totalUCAS = totalUCAS + CharM;
			}
			
			if (grade == 'P'){
				totalUCAS = totalUCAS + CharP;
			}
			
			counter++;
		}
		
		System.out.println("Your overall UCAS points are: " + totalUCAS);
		
		File someFile = new File("UCAS_POINTS.txt");
		
		BufferedWriter output = new BufferedWriter(new FileWriter(someFile));
		
		output.write("Program created by John :) You have " + totalUCAS + " points.");
		
		output.close();
		
	}

}

if there is something that i have done that could have been done more efficiently then not my fault im a noob haha :)

Thanks in advance.

[JosAH]

I see a bunch of Sytem.out.println( ... ) calls so you can't use javaw.exe for it because that version of the jvm doesn't fire up a console for you. What are you using for your command line?

kind regards,

Jos

[JonnySnip3r]

Hey dude im using command prompt in windows. is there any other way you suggest?

Thanks :)