CODEWITHSUNDEEP
javawindowsbatch-filejarpipe
Hunterr
Hunterr

Reputation: 553

Automating jar input

I have a jar file which asks user the value of n. And adds the values entered. When the jar is executed from cmd.exe, works well. But when invoked from .bat file, it is not prompting for the input rather executes the further statements. I tried using pipe,as,

(echo 3 echo 10 echo 20 echo 30)| java -jar add.jar

but didn't work.How can I automate the input?

Note: values are not accepted as arguments, but as a prompt.

Upvotes: 1

Views: 910

Answers (1)

SubOptimal
SubOptimal

Reputation: 22963

Without knowing something about the code it's hard to tell why it's not working for you.

See below a simple working example

Add.java

import java.util.Scanner;

public class Add {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int sum = 0;
        while (scanner.hasNextInt()) {
            int value = scanner.nextInt();
            sum += value;
            System.out.println("sum = " + sum);
        }
    }
}

run.bat

@echo off
(echo 2
echo 10
echo 20
echo 30
echo end ) | java -jar Add.jar

compile and build the jar

javac Add.java
echo Main-Class: Add > manifest.mf
jar cmf manifest.mf Add.jar Add.class

run the batch file

run.bat

output

sum = 2 
sum = 12
sum = 32
sum = 62

Upvotes: 2

Related Questions