Sometime back, we were discussing thing around JRE and one of my friends Lawrence asked me "How to find the cipher of JRE installed on association near the sustain of Java Code ? "
After liberal noticeably reflection to it, I don't believe Java has any such API which will describe how many another JRE are installed on the System and what are they ? One of my other assistant Vikram told me that JRE beginning paperwork data in Registry. With this acquaintance at the hindsight, I proven to indite this piece of written language.
It will simply run on Windows :) because I have previously owned Runtime kind. I would friendliness to cognise how the identical could be achieved in Unix Systems. This opinion is not doing anything great, lately queries the registry and reflects the response on the table.
import island.io.*;
class NoofJRE {xUnit Test Patterns: Refactoring Test Code
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Shirleystatic String REG_PATH = "reg inquiring "
""HKLMSoftwareJavaSoftJava Runtime Environment";
public undynamic invalid getJREInfo() {
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3 Livestry {
Process activity = Runtime.getRuntime().exec(REG_PATH);
InputStream inputstream = route.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
String line;
while ((line = bufferedreader.readLine()) != void) {
System.out.println(line);
}
}
catch (Exception e) {
System.out.println("I am in Exception");
}
}
public rigid null and void chief(String s[]) {
getJREInfo();
}
}
And present is my output:
E:Program FilesJavajdk1.6.0bin>java NoofJRE
! REG.EXE VERSION 3.0
HKEY_LOCAL_MACHINESoftwareJavaSoftJava Runtime Environment
CurrentVersion REG_SZ 1.6
BrowserJavaVersion REG_SZ 1.6.0_01
HKEY_LOCAL_MACHINESoftwareJavaSoftJava Runtime Environment1.4.2_17
HKEY_LOCAL_MACHINESoftwareJavaSoftJava Runtime Environment1.6
HKEY_LOCAL_MACHINESoftwareJavaSoftJava Runtime Environment1.6.0
HKEY_LOCAL_MACHINESoftwareJavaSoftJava Runtime Environment1.6.0_01
Which sounds literal in my suit. It is cogently telltale me that I have JRE 1.4.2_17, 1.6.0 and 1.6.0_01. I have old bad dependence of not uninstalling JRE's :).
Please do let me cognise if here is any remaining way to cognize how copious and which JRE is/are installed in my association.
To cognise where on earth the JRE is installed, one has to do a elemental interrogation of JAVA_HOME in the register.
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