Complete Java SE 8 Developer Bootcamp - Marker and Functional Interfaces

The video tutorial covers two types of interfaces in Java: marker interfaces and functional interfaces. Marker interfaces, like Serializable, have no methods and are used to indicate certain properties of a class. Functional interfaces have one abstract method and are linked to lambda expressions introduced in Java 8. The tutorial explains the purpose and usage of these interfaces, including the Serializable interface's role in object serialization and the concept of transient fields.

What is a marker interface in Java?

• An interface with one abstract method

• An interface with no methods at all

• An interface that requires implementation of all methods

• An interface with multiple default methods

What is the primary purpose of the Serializable interface?

• To provide a default implementation for methods

• To ensure objects can be cloned

• To enable objects to be converted into byte arrays

• To allow objects to be compared

Which keyword is used to prevent a field from being serialized?

• static

• volatile

• final

• transient

What defines a functional interface in Java?

• An interface with multiple abstract methods

• An interface with only static methods

• An interface with one abstract method

• An interface with no methods

How does Java 8 relate to functional interfaces?

• It deprecated functional interfaces

• It introduced marker interfaces

• It removed the need for interfaces

• It introduced lambda expressions