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14 Replies Latest reply: Dec 21, 2007 4:43 AM by 807603 RSS

Getting java version build number

807603 Newbie
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Dear Java programmers

I am trying to extract java version build number, I know you can get java version number by using System.getProperties("java.version"). But if the String version = "1.6.0_10-ea" I just want to retrieve the build number 10.

This is how I am doing it at the moment

private static int getJavaVersionBuildNumber(String version) {
try {
int index = version.indexOf("_");
String versionBuild = version.substring(index+1);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < versionBuild.length(); i++) {
if (Character.isDigit(versionBuild.charAt(i)))
else break;
String versNumber = String.valueOf(sb);
if (versNumber.equals("")) return -1;
return Integer.valueOf(versNumber).intValue();
} catch (Exception e) {
return -1;

I would welcome advice if there is a better way of doing this.