Identify JDK version from Java

Question

I am creating an IDE and when the user presses to run the code I do the following:

try {
    File file = new File(arquivoSelecionado.nome);
    try {
        FileWriter fw = new FileWriter(file);
        fw.append(code.getText());  
        fw.close();

    } catch (Exception ex) {
        System.out.println(ex.getMessage());
    }
    Runtime.getRuntime().exec("C:\\Program Files\\Java\\jdk1.8.0_31\\bin\\javac "+file.getName());
    Thread.sleep(2000);
    Process pro = Runtime.getRuntime().exec("cmd /c start java "+file.getName().replaceAll(".java", ""));   

} catch (Exception e1) {
    e1.printStackTrace();
}

only that as it is possible to see I am putting a fixed path to the jdk folder, in this case the version is the one that is in my computer, the problem is that when the jdk version is different from the one that is in the fixed path it does not run the terminal running the program

what I wanted to know is if there is any way to identify the version of jdk that the IDE is running on

Answer 1

Perhaps a more efficient way is to inspect the JAVA_HOME environment variable:

String javaHome = System.getenv("JAVA_HOME");

To String that returns from this method brings various information, among them, the path in which the compiler is installed.

Just note the fact that if the computer running your program does not have Java installed, the variable javaHome will be void.