Check if the program is running on Windows

Question

Good night.

I was wondering if you could give me a JAVA example of how to check if my program JAVA-MADE is running on Windows.

Taking advantage of the topic, I would also like to know how I execute a command in CMD USING JAVA if it is running the program on Windows. It is common that windows cmd does not recognize accents, but just type the command "chcp 65001" that he recognizes...

In short, I would like to check if the user has run the program JAVA-MADE in windows and if yes run the command JAVA "chcp 65001".

Answer 1

I answered that question when I had the tag cmd.

This code checks if the Notepad is open, if it is running the command chcp 65001:

@echo off
set programa=notepad.exe

tasklist /FI "IMAGENAME eq notepad.exe" 2>NUL | find /I /N "notepad.exe">NUL
if "%ERRORLEVEL%"=="0" (
    echo O %programa% esta aberto.
    chcp 65001
) else (
    echo O %programa% nao esta aberto.
)

pause > nul

Answer 2

Just use the system properties os.name, os.version and os.arch. They are documented here.

See a very simple code:

class Teste {
    public static void main(String[] args) {
        System.out.println(System.getProperty("os.name"));
        System.out.println(System.getProperty("os.version"));
        System.out.println(System.getProperty("os.arch"));
    }
}

Here’s his way out on my laptop:

Windows 8.1
6.3
amd64

I put him in the ideone. Here’s the way out there:

Linux
3.16.0-4-amd64
amd64

To execute the chcp 65001, you can use the method Runtime.exec(String):

import java.io.IOException;

public class TrocaAcentos {
    public static void main(String[] args) throws IOException {
        if (System.getProperty("os.name").contains("Windows")) {
            Runtime.getRuntime().exec("C:\\Windows\\System32\\cmd.exe /k chcp 65001");
        }
    }
}