How to get java version using single command in Windows command prompt?

Question

I need to fetch java version 1.6.0_26 from the below java -version output

java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing)

Please help me getting 1.6.0_26

Note: I don't need power shell or any external programs

UPDATE

I came up with java -version 2>&1 | findstr /i "version" java -version 2>&1 | findstr /i "version" which give me below output

java version "1.6.0_22"

now even a java way of pattern matching or regex will work for me :)

Answer 1

You can run the solution from the question Pangea linked to in a single line:

c:\>for /f "tokens=3" %g in ('java -version 2^>^&1 ^| findstr /i "version"') do @echo %g
"1.6.0_24"
c:\>for /f "tokens=3" %g in ('java -version 2^>^&1 ^| findstr /i "version"') do ( @set v=%g & @echo %v:~1,8% )
1.6.0_24

I just checked and it seems my second example only works with Windows7, the following works for me on Windows XP (so it should work on Windows7 as well)

for /f "tokens=3" %g in ('java -version 2^>^&1 ^| findstr /i "version"') do ( @echo %~g )

Answer 2

你可以从命令promt C：> java -version中从单行执行

Answer 3

你可以试试：

java -version 2>&1 | awk '/version/ {print $3}' | egrep -o '[^\"]*'

Answer 4

for /f tokens^=2-5^ delims^=.-_^" %j in ('java -fullversion 2^>^&1') do @set "jver=%j%k%l%m"

This will store the java version into jver variable and as integer And you can use it for comparisons .EG

if %jver% LSS 16000 echo not supported version

.You can use more major version by removing %k and %l and %m.This command prompt version.

For .bat use this:

@echo off
PATH %PATH%;%JAVA_HOME%\bin\
for /f tokens^=2-5^ delims^=.-_^" %%j in ('java -fullversion 2^>^&1') do set "jver=%%j%%k%%l%%m"

According to my tests this is the fastest way to get the java version from bat (as it uses only internal commands and not external ones as FIND , FINDSTR and does not use GOTO which also can slow the script). Some JDK vendors does not support -fullversion switch or their implementation is not the same as this one provided by Oracle (better avoid them).

Answer 5

Based on @a_horse_with_no_name but detecting first if command exists.

where java > nul
if %ERRORLEVEL% neq 0 (
    set java_v="Command not found"
) else (
    for /f "tokens=3" %%g in ('java -version 2^>^&1 ^| findstr /i "version"') do set java_v=%%g
)
echo  Java: %java_v:~1,8%

Answer 6

I wrote the below function to fetch java version 1.6.0_26

String regexMatch(String myInput, String myRegex)
{
String ResultString
Pattern regex
Matcher regexMatcher

regex = Pattern.compile(myRegex, Pattern.DOTALL);

regexMatcher = regex.matcher(myInput);

List<String> matchList = new ArrayList<String>();
while (regexMatcher.find()) {
    matchList.add(regexMatcher.group());
}

for(int i=0;i<matchList.size();i++)
{
    myInput=myInput.replaceAll( matchList[i], '')
}
return myInput;
}

and call

rs=regexMatch(rs,"[a-zA-Z\"]+")

where rs="java version \\"1.6.0_26\\""