Complete Java SE 8 Developer Bootcamp - Predicate

The video tutorial explains the concept of the predicate interface introduced in Java 8, which is used to run tests on objects and return a Boolean result. It covers the parameter type T in generics, demonstrating how predicates can be used in methods to determine if a customer should be included in a promotional mailing. The tutorial also shows how lambda expressions can be used to pass tests to the predicate, with an example of checking if a customer's age is over 18.

What is the primary purpose of a predicate in Java?

• To perform arithmetic operations

• To run a test on a parameter and return a boolean

• To sort a list of objects

• To manage memory allocation

What does the type parameter T in Predicate signify?

• The return type of the test method

• The type of object passed into the test method

• The number of parameters the test method accepts

• The name of the test method

How does the Predicate interface determine the result of a test?

• By generating a random boolean value

• By comparing two objects

• By executing a test method that returns a boolean

• By checking the size of a collection

In the promotional mailing example, what condition is used to decide if a customer receives a mailing?

• The customer's name starts with 'A'

• The customer lives in a specific city

• The customer's age is greater than or equal to 18

• The customer has made a purchase in the last month

What is the role of a Lambda expression in the promotional mailing example?

• To log the results of the test

• To send the promotional email

• To execute the test condition for the predicate

• To create a new customer object