JAVA EE: Java Tutorial: Java Runtime class (exec(String command,String[] envp,File dir) method)

Monday, 30 January 2017

Java Tutorial: Java Runtime class (exec(String command,String[] envp,File dir) method)

Click here to watch in Youtube :
https://www.youtube.com/watch?v=-AzVJNru9Ls&list=UUhwKlOVR041tngjerWxVccw

RuntimeDemo.java

import java.io.File;
import java.io.IOException;

/*
 * public Process exec(String command, String[] envp,
 *                              File dir) throws IOException
 * 
 * Parameters: 
 * -----------
 * 
 * command - a specified system command.
 * 
 * envp - array of strings, each element of which has
 * environment variable settings in the format
 * name=value, or null if the subprocess should inherit
 * the environment of the current process.
 * 
 * dir - the working directory of the subprocess, or
 * null if the subprocess should inherit the working
 * directory of the current process.
 */

public class RuntimeDemo
{

    public static void main(String[] args) throws IOException
    {
        /*
         * Returns the runtime object associated with the
         * current Java application.
         */
        Runtime runtime = Runtime.getRuntime();

        /*
         * Create a file with the working directory we wish
         */
        File dir = new File("D:/Work/");

        /*
         * Executes the specified string command in a
         * separate process with the specified environment
         * and working directory.
         * 
         * It will open a new notepad.
         */
        Process process = runtime.exec("notepad.exe", null, dir);
        System.out.println("is process alive = " + process.isAlive());
    }

}