Here you can find the source of closePort()
public static void closePort() throws NullPointerException
//package com.java2s; /*/*w w w .j ava 2 s . c o m*/ * Copyright (c) 2016 StarFruitBrasil * * Permission is hereby granted, free of charge, to any * person obtaining a copy of this software and associated * documentation files (the "Software"), to deal in the * Software without restriction, including without * limitation the rights to use, copy, modify, merge, * publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software * is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice * shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY * KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ import java.io.IOException; public class Main { private static volatile boolean isOpen = false; private static Process p; public static void closePort() throws NullPointerException { isOpen = false; try { p.getErrorStream().close(); p.getInputStream().close(); p.getOutputStream().close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } p.destroy(); } }