Java 8 Predicate Function Chaining Predicate Joining interview questions Live Demo Code Decode

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In this video of code decode we have covered Java 8 || Predicate || Function || Chaining || Predicate Joining interview questions (Live Demo) • Udemy Course of Code Decode on Microservice k8s AWS CICD link: • https://openinapp.co/udemycourse • Course Description Video : • https://yt.openinapp.co/dmjvd • here are lots of new features which were added in Java 8. Here is the list of important features which are mostly asked as java 8 interview questions: • Lambda Expression • Stream API • Default methods in the interface • Predicate • Functional Interface • Optional • Method references • Date API • Nashorn, JavaScript Engine • Main advantages of using Java 8? • More compact code • Less boiler plate code • More readable and reusable code • More testable code • Parallel operations • Q) What are predicates? • Predicate is a predefined Functional Interface (Having only 1 abstract method). • The only abstract method of predicate is test(T t): • public boolean test(T t); • Whenever we want to check some boolean condition then you can go for Predicates. • Q) How to use Predicates? • Say if you need to test if the length of the given string is greater than or equal to 5. Then in such situations where you need to test conditions, use test() method of predicate. • Q) Type parameter and return types of Predicates? • Input to predicate can be anything like • Hence only 1 type argument is required which is input type in predicate. • Return type is not required as its always Boolean only. • Q) Advantages of Predicates? • Code Reusability • If you have same conditions being used 100 times in a prgram then you can write once and just use 100 times with checkLength.test(different string to be tested). • Conditional checks are holded by Functional interfaces. • Q) What is Predicate joining? • You can combine predicates in serial predicate • Three ways to join : • And • Or • Negate • Eg if you want to test 2 conditions: • To check length of string • To check if length is even. • Q) What are Functions • Function is also a predefined Functional Interface (Having only 1 abstract method). • The only abstract method of Function is apply(T t); • R apply(T t); • Given some input perform some operation on input and then produce / return result (not necessary a boolean value). • This takes 1 input and returns one output. • In predicate we used to take 1 input and return type is always boolean. • In function return type is not fixed hence we declare both input type and return type. • Q) What is Functional chaining • We can combine / chain multiple functions together with andThen . • There are two ways to combine functions: • f1.andThen(f2).apply(Input); - first f1 then f2 • f1.compose(f2).apply(Input) - first f2 then f1 • • Multiple functions can be chained together like : • f1.andThen(f2).andThen(f3).andThen(f4).apply(Inputs); • ------------------------------------------------------------------------------------------------------------------------------------- • Code Decode Playlists • Most Asked Core Java Interview Questions and Answers : • Core Java frequently asked Interview ... • Advance Java Interview Questions and Answers : • Advance Java Interview Questions • Java 8 Interview Questions and Answers : • Java 8 Interview Questions(New Features) • Hibernate Interview Questions and Answers : • Hibernate Interview Questions Java • Spring Boot Interview Questions and Answers : • Advance Java Interview Questions • Angular Playlist : • Angular Course Introduction || Angular 8 • GIT : • GIT • ------------------------------------------------------------------------------------------------------------------------------------- • Subscriber and Follow Code Decode • Subscriber Code Decode : https://www.youtube.com/c/CodeDecode?... • Linkedin : / codedecodeyoutube • Instagram : / codedecode25 • -------------------------------------------------------------------------------------------------------------------------------------- • #java8InterviewQuestions #java8newfeatures #java8

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