public static @Nullable String defaultJavaLocation() {
    if (SystemInfo.isWindows) {
      return JavaHomeFinderWindows.defaultJavaLocation;
    }
    if (SystemInfo.isMac) {
      return JavaHomeFinderMac.defaultJavaLocation;
    }
    if (SystemInfo.isLinux) {
      return "/opt/java";
    }
    if (SystemInfo.isSolaris) {
      return "/usr/jdk";
    }
    return null;
  }
public static @Nullable String defaultJavaLocation()