Checks if a process is running or not. Works on both Unix/Linux as well as Windows.

ProcessChecker.java

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * @author Kurt P
 * @version 2.5.12272012
 */
public class ProcessChecker {

    /**
     * Checks if a specific process is running
     *
     * @param String application. The application to check for (Must have ".exe" at the
     * end to distinguish applications which start with the same name.)
     * @return true if process is found
     */
    public boolean check(String application) {
  	//TODO: MAKE THIS DO A SWITCH STATEMETN INSTEAD OF A 4 IF STATEMENTS.
        if (checkOS().contains("Windows")) {
            try {
                String line;
                Process p = Runtime.getRuntime().exec(System.getenv("windir")
                        + "\\system32\\" + "tasklist.exe");
                BufferedReader input = new BufferedReader(
                        new InputStreamReader(p.getInputStream()));

                while ((line = input.readLine()) != null) {
                    if (line.contains(application)) { //Parsses the line
                        return true;
                    }
                }
                input.close();
            }
            catch (Exception err) {
                Outputter.getInst().error(err);
            }
            return false;
        }

        else if (checkOS().contains("Linux")) {
            try {
                String line;
                Process p = Runtime.getRuntime().exec("ps -e");
                BufferedReader input = new BufferedReader(
                        new InputStreamReader(p.getInputStream()));
                while ((line = input.readLine()) != null) {
                    if (line.contains(application)) {
                        return true;
                    }
                }
                input.close();
            }
            catch (Exception err) {
                Outputter.getInst().error(err);
            }
            return false;
        }

        else if (checkOS().contains("Mac OS")) {
            try {
                String line;
                Process p = Runtime.getRuntime().exec("ps -e");
                BufferedReader input = new BufferedReader(
                        new InputStreamReader(p.getInputStream()));
                while ((line = input.readLine()) != null) {
                    if (line.contains(application)) {
                        return true;
                    }
                }
                input.close();
            }
            catch (Exception err) {
                Outputter.getInst().error(err);
            }
            return false;
        }

        else {
            return false;
        }
    }

    /**
     * @return A string containing the name of the operating system.
     */
    private String checkOS() {
        String os;
        os = System.getProperty("os.name");
        return os;
    }
}