Run Minecraft Client in IDE

public static void main(String[] args) {
  String line;
  Process p;
  String os = System.getProperty("os.name");
  try {
    if(os.equalsIgnoreCase("win")) {
      p = Runtime.getRuntime().exec("gradlew runClient");
    } else {
      p = Runtime.getRuntime().exec("./gradlew runClient");
    }
    BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
    while ((line = input.readLine()) != null) {
      System.out.println(line);
    }
    input.close();
  } catch (IOException e) {
      e.printStackTrace();
  }
}