Java Shell Command getJavaVersion(String command)

Description

Retrieves the version of the java vm indicated by the command string.

License

Mozilla Public License

Parameter

Parameter	Description
command	a parameter

Exception

Parameter	Description
IOException	an exception
InterruptedException	an exception

Declaration

public static String getJavaVersion(String command) throws IOException, InterruptedException 

Method Source Code

//package com.java2s;
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class Main {
    /**//  w w  w.j  a v a2 s  . c  o  m
     * Retrieves the version of the java vm indicated by the command string.
     * 
     * @param command
     * @return
     * @throws IOException
     * @throws InterruptedException
     */
    public static String getJavaVersion(String command) throws IOException, InterruptedException {
        String run_command = "'" + command + "' -version";
        System.out.println(run_command);
        Process p;
        String[] args = { command, "-version" };
        p = Runtime.getRuntime().exec(args);
        p.waitFor();
        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getErrorStream()));
        String line = reader.readLine();
        int row = 0;
        while (line != null) {
            line = reader.readLine();
            if (line.startsWith("Java(TM)")) {
                if (line.contains("build")) {
                    int start = line.indexOf("build");
                    System.out.println(start);
                    return line.substring(start + "build".length()).replace(")", "").trim();
                } else {
                    return null;
                }
            }
        }
        return null;
    }
}

Related

1. runCommand(final ProcessBuilder command)
2. runCommand(String cmd)
3. runCommand(String cmd)
4. runCommand(String command)