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

In this video of code decode we have covered Java 8 || Predicate || Function || Chaining || Predicate Joining interview questions (Live Demo)

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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

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:

Multiple functions can be chained together like :

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[kbhoyi]

Like your excitement and passion that you explain. You teach the concepts with simple, easy to understand examples. God bless you Mam !

[shubhisharma]

Earlier when i tried to learn predicate and functions it looks very complicated to me, but after watching your tutorial it looks to be simple thing. Your way of explaining it awesome.

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[duraisinghjebastin]

Very useful video to understand about predicate and function 👍

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Hi @Code Decode, thank you so much for the effort for these content.. It would have been great if could share these slides with us.

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[soumyadas]

Thank you for such clear explanation of these java 8 features along with easy to understand examples.

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[karthikeyanu]

Helps to understand easily and expecting a video on other functional interfaces soon
Thanks

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