Java 11 Programming for Beginners 5.3: Working with Annotations

The video tutorial covers the use of annotations in Java, focusing on their role as metadata to enhance code functionality and safety. It explains how annotations can help reduce boilerplate code, improve error detection, and facilitate code generation. The tutorial also discusses functional interfaces and Lambda expressions, providing practical examples and theoretical insights. Common Java annotations like Deprecated, Override, and Functional Interface are explored, highlighting their significance in programming. The video concludes with a brief look at future topics, such as the Date Time and Money API.

What is the primary benefit of using a functional interface with a lambda expression in Java?

• It reduces the need for boilerplate code.

• It makes the code less readable.

• It increases the execution time of the program.

• It allows multiple methods to be implemented.

How do annotations help in managing null values in Java?

• They remove null values from the code.

• They provide warnings when null values are used inappropriately.

• They replace null values with empty strings.

• They automatically convert null values to default values.

What role do annotations play in the build process of a Java program?

• They slow down the build process.

• They provide additional metadata for error detection.

• They are ignored during the build process.

• They increase the size of the compiled code.

Which annotation would you use to indicate that a method is no longer recommended for use?

• @Override

• @FunctionalInterface

• @Deprecated

• @SuppressWarnings

What is the purpose of the @Override annotation in Java?

• To mark a method as a functional interface.

• To ensure a method is correctly overriding a superclass method.

• To suppress compiler warnings.

• To indicate that a method is deprecated.

Which annotation allows for multiple annotations of the same type to be applied to a single element?

• @Inherited

• @Repeatable

• @Target

• @Retention

In Java, what does the @FunctionalInterface annotation signify?

• The interface can have multiple abstract methods.

• The interface is deprecated.

• The interface should have exactly one abstract method.

• The interface is used for error suppression.