source: tags/gsdl-2_70u-distribution/gli/CheckJavaVersion.java@ 11745

public class CheckJavaVersion
{
    static public void main(String[] args)
    {
    String java_version = System.getProperty("java.version");
    System.out.println("Java version: " + java_version);

    try {
        // Identify major version number
        int major_dot_position = java_version.indexOf(".");
        String java_version_major_string = java_version.substring(0, major_dot_position);
        int java_version_major = (new Integer(java_version_major_string)).intValue();

        // Identify minor version number
        int minor_dot_position = java_version.indexOf(".", major_dot_position + 1);
        String java_version_minor_string = java_version.substring(major_dot_position + 1, minor_dot_position);
        int java_version_minor = (new Integer(java_version_minor_string)).intValue();

        // Version of Java must be 1.4 or higher to run the GLI
        if (java_version_major > 1 || (java_version_major == 1 && java_version_minor >= 4)) {
        // Valid
        System.exit(2);
        }
        else {
        // Invalid
        System.exit(1);
        }
    }
    catch (Exception exception) {
        System.err.println("Exception: " + exception);
    }
    }
}