Advanced Features in Java: Using Built-in Annotations

Expected Duration
Lesson Objectives
Course Number
Expertise Level


In this course, you'll learn how annotations are defined and used in Java. You'll explore three popular built-in annotations, the @Override, @Deprecated, and @SuppressWarnings built-in annotations. Next, you'll examine how the @Override annotation is a valuable aid in detecting and fixing typos in the names of overridden methods, and crucially, helps to detect such issues at compile-time rather than at run-time. Then you'll explore the @Deprecated annotation and see how if you mark a class, method, or variable with the @Deprecated annotation, Java will issue an appropriate warning when you reference that element. You'll also learn about the @SuppressWarnings annotation, which does exactly what its name suggests, and for that reason ought to be used only with extreme caution, if at all. The @SuppressWarnings annotation allows the selective suppression of different types of warnings. You can also entirely eliminate all compiler warnings using @SuppressWarnings annotation with the "all" input argument, but this is quite dangerous and is an especially egregious programming practice.

Expected Duration (hours)

Lesson Objectives

Advanced Features in Java: Using Built-in Annotations

  • discover the key concepts covered in this course
  • define a method, override it, and then mark that overridden version with the @Override annotation
  • apply the @Override annotation to detect typographical errors in method names at compile-time rather than at run-time
  • recognize different common overrides of methods in java.lang.Object such as the .toString, .equals, and .hashCode methods
  • identify correctly and incorrectly overridden implementations of the .equals method
  • recognize how the @Deprecated annotation can be used to flag the instantiation of objects of deprecated classes at compile-time
  • analyze how the @Deprecated annotation works on elements other than classes
  • recognize how the forRemoval named element from the @Deprecated annotation works
  • enumerate different scenarios in which the @SuppressWarnings annotation can be applied
  • recognize the different warnings that can be eliminated using the @SuppressWarnings annotation, and why this annotation ought to be used sparingly, if at all
  • summarize the key concepts covered in this course
  • Course Number:

    Expertise Level