I have a program on eclipse and exported it as a runnable JAR file, how do I run it on a double click?

Question

import java.util.Scanner;

public class NumberAverager {

/**
 * Averages Inputted Numbers
 */
public static void main(String[] args) {

    int num1;
    int total = 0;
    int count = 0;
    //int[] numArray = new int[count];
    String input;
    Scanner keyboard = new Scanner(System.in);

    do
    {   
        if (count == 0)
        {
            System.out.println("Please enter the first number you wish to average.");
            input = keyboard.nextLine();
        }

        count++;

        System.out.println("Please enter your next number or 'calculate' to find the average.");
        input = keyboard.nextLine();

            try 
            {
                num1 = Integer.parseInt(input);
                total = total + num1;
                //numArray[count]=num1;  
            }

                catch (NumberFormatException e)
                {
                        System.out.println("You entered " + count + " numbers.");
                        System.out.println("The average is " + (float)total/count);
                        //System.out.println(numArray[count]);
                        input = "calculate";
                }


    } while (input!= "calculate");

    keyboard.close();
}
}

There's my program if that helps,

The manifest says the following:

Manifest-Version: 1.0
Main-Class: NumberAverager

It's just a short program to try to do this, but I don't know what else I have to do to make it work, I'm not sure how to run it from the command line to try it that way, and upon double clicking it the mouse loads for a second and nothing happens

thanks

I'm very new to java, only a beginning semester under my belt, so I need very detailed explanations on how to do this, thanks again

possible duplicate of [How do you run exported .jar from Eclipse with double click?](http://stackoverflow.com/questions/6414257/how-do-you-run-exported-jar-from-eclipse-with-double-click) — Perception, Dec 20 '12 at 06:45

score 0 · Answer 1 · answered Dec 20 '12 at 06:41

0

You need a UI for it to display something when you double click. Otherwise it will run the code but its not gonna display anything.

Here is a tutorial on making a GUI

answered Dec 20 '12 at 06:41

RisingSun

1,693
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How do I go about doing that? – bassandguitar Dec 20 '12 at 06:42
Could you show me what specifically code wise I should add to do this? – bassandguitar Dec 20 '12 at 06:50
Look at the tutorial. There is a Hello World example – RisingSun Dec 20 '12 at 07:16
Thanks looking at it now, so do you think it runs, but just that nothing shows up because there is no GUI? – bassandguitar Dec 20 '12 at 07:20

Stanley · Answer 2 · 2012-12-20T06:50:21.240

0

Use java -jar to execute your jar file in command prompt.

java -jar C:/path/to/jar/your_jar_file.jar

edited Dec 20 '12 at 06:50

answered Dec 20 '12 at 06:43

Stanley

5,057
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I type it in just like that in the cmd line? – bassandguitar Dec 20 '12 at 06:44
Yes. Make sure you enter the full path to your jar file or go to the directory where the jar file exists before executing the command. – Stanley Dec 20 '12 at 06:46
where do I enter the path of the file? – bassandguitar Dec 20 '12 at 06:48
`java -jar C:/path/to/jar/your_jar_file.jar` – Stanley Dec 20 '12 at 06:49
It said Error: Unable to access jarfile C:\Users\Ben – bassandguitar Dec 20 '12 at 06:54
Make sure you enclose the path with double quotes if it contains space. `java -jar "C:/path/to/jar/your_jar_file.jar"` – Stanley Dec 20 '12 at 06:56
Okay, so that works and it executes from the cmd line, how do I make it work now by just double clicking it? – bassandguitar Dec 20 '12 at 06:58

score 0 · Answer 3 · answered Dec 20 '12 at 06:49

0

java -jar <PATH_TO_YOUR_JAR_FILE>

and make sure java is there in $PATH

answered Dec 20 '12 at 06:49

Rahul

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I typed in java -jar C:\Users\Ben\Desktop\NumberAverager.jar What do you mean make sure java is there? – bassandguitar Dec 20 '12 at 06:52
on your console, type java --version. It should give an output specifying the java version. If not, make sure jdk is installed properly – Rahul Dec 20 '12 at 06:55
I don't understand what you mean by type it on my console, I'm sorry, do you mean cmd line? – bassandguitar Dec 20 '12 at 06:57
It says: java version "1.7.0_10" Java SE Runtime Environment Java HotSpot 64-Bit Server VM – bassandguitar Dec 20 '12 at 07:00
the program runs from the cmd prompt I just don't know how to make it run by double clicking it – bassandguitar Dec 20 '12 at 07:03
Eclipse has an option to package required libraries into the runnable jar. File -> Export... Choose runnable jar and click next. The runnable jar export window has a radio button where you can choose to package the required libraries into the jar. – Rahul Dec 20 '12 at 07:13
The double click thing should work i think. If you are on Windows, then Right Click on the jar itself, go to Open With.. and make sure the selected program is called something like Java(TM) Platform SE Binary. If someting goes wrong open the Java console and paste the error for us to help (go to Java Control Panel, in Control Panel on Windows, Advanced tab, Java console and check Show console). – acostache Dec 20 '12 at 07:13
Nothing happens when I double click the program, I don't know why, is it because there is no GUI stuff, someone else on here said that? – bassandguitar Dec 20 '12 at 07:20

I have a program on eclipse and exported it as a runnable JAR file, how do I run it on a double click?

3 Answers3