Here you can find the source of isExecutableOnPath(String execName)
public static boolean isExecutableOnPath(String execName)
//package com.java2s; /*//from w w w. j a v a 2s . c o m * Copyright 2016, Red Hat, Inc. and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import java.io.File; import java.nio.file.Files; import java.nio.file.Paths; import java.util.regex.Pattern; import java.util.stream.Stream; public class Main { public static boolean isExecutableOnPath(String execName) { return Stream.of(System.getenv("PATH").split(Pattern.quote(File.pathSeparator))).map(Paths::get) .anyMatch(path -> Files.exists(path.resolve(execName))); } }