Complete Java SE 8 Developer Bootcamp - Lambda Expressions

The video tutorial introduces Lambda expressions in Java 8, explaining their syntax and advantages over traditional interface implementations. It covers how Lambdas simplify code by allowing method implementations to be passed without creating new classes. The tutorial also explores advanced Lambda syntax, including handling multiple parameters and simplifying expressions.

What is the primary purpose of Lambda expressions introduced in Java 8?

• To replace all object-oriented programming concepts

• To allow code blocks to be passed around like objects or primitives

• To make Java code run faster

• To eliminate the need for any interfaces

In the traditional implementation of a functional interface, what must be done to use a new method implementation?

• Create a new class and override the method

• Use a static method

• Use a built-in Java method

• Directly modify the interface

How do Lambda expressions simplify the implementation of functional interfaces?

• By removing the need for any parameters

• By allowing method implementations without creating new classes

• By automatically generating method bodies

• By using only static methods

What is the role of the arrow token in a Lambda expression?

• It is used to declare variables

• It indicates the end of a method

• It marks the start of a class

• It separates the parameter list from the method body

When can you omit the parameter type in a Lambda expression?

• When there are no parameters

• When the parameter is an integer

• When the method is static

• When there is only one parameter

What must be true to omit parentheses around a parameter in a Lambda expression?

• There must be only one parameter

• The parameter must be a string

• The parameter must be an object

• The method must return void

Can the parameter names in a Lambda expression differ from those in the functional interface?

• No, unless the method is static

• No, they must always match

• Yes, as long as they are used consistently in the body

• Yes, but only if they are primitive types