Introduction to Programming

requireNonNull() 

The following methods of the class Objects check the value of the first parameter and, if the value is null, either throw NullPointerException or return the provided default value:

• T requireNonNull(T obj): Throws NullPointerException without a message if the parameter is null:

      String object = null;      try {          Objects.requireNonNull(object);      } catch (NullPointerException ex){          System.out.println(ex.getMessage());  //prints: null      }

• T requireNonNull(T obj, String message): Throws NullPointerException with the message provided if the first parameter is null:

      String object = null;      try {          Objects.requireNonNull(object, "Parameter 'object' is null");      } catch (NullPointerException ex){          System.out.println(ex.getMessage());            //Parameter ...