Javaでカスタムの未チェック例外を作成するにはどうすればよいですか?

public class MyCustomException extends RuntimeException {
   public MyCustomException(String message) {
      super(message);
   }
}

public class CustomUncheckedException extends RuntimeException {
   /*
   * Required when we want to add a custom message when throwing the exception
   * as throw new CustomUncheckedException(" Custom Unchecked Exception ");
   */
   public CustomUncheckedException(String message) {
      // calling super invokes the constructors of all super classes
      // which helps to create the complete stacktrace.
      super(message);
   }
   /*
   * Required when we want to wrap the exception generated inside the catch block and rethrow it
   * as catch(ArrayIndexOutOfBoundsException e) {
      * throw new CustomUncheckedException(e);
   * }
   */
   public CustomUncheckedException(Throwable cause) {
      // call appropriate parent constructor
      super(cause);
   }
   /*
   * Required when we want both the above
   * as catch(ArrayIndexOutOfBoundsException e) {
      * throw new CustomUncheckedException(e, "File not found");
   * }
   */
   public CustomUncheckedException(String message, Throwable throwable) {
      // call appropriate parent constructor
      super(message, throwable);
   }
}