Top 20 Java 8 Stream Api Operations | Coding Interview Questions And Answers | Features |Code Decode

in this video of code decode we have covered top 20 java 8 stream operations.
If you want to participate in Mock Interview send your nominations using the below google form

Udemy Course Discounted Link

In java 8 coding interview, there can be a tricky question that we might not be able to solve if we dont know all possible operations available

So today we will see all such operations and there usages so that we can apply them on the go. This can help in understanding their usage and implications.

Certainly! Below is a list of Java 8 Stream API operations, each with a question that focuses on achieving a specific goal using the operation, followed by the solution. This format will help in understanding how to use each operation effectively.

### 1. `**filter**`
**Question:** Fetch all numbers from a list that are greater than 5.

### `**map**`
**Question:** Transform a list of strings into a list of their uppercase versions

### `**flatMap**`
**Question:** Given a list of lists of strings, flatten them into a single list of strings.

### `**distinct**`
**Question:** Remove duplicates from a list of integers.

### `**sorted**`
**Question:** Sort a list of names in reverse alphabetical order.

### `**peek**`
**Question:** Print each element in a list while converting them to uppercase.

### `**limit**`
**Question:** Fetch the first 3 elements from a list of integers.

### `**skip**`
**Question:** Skip the first 4 elements and fetch the remaining elements from a list of integers.

### `**forEach**`
**Question:** Print each element of a list of strings with a prefix "Item: ".

### `**collect**`
**Question:** Collect a list of integers into a `Set`.

### `**reduce**`
**Question:** Compute the product of all numbers in a list.

### `**allMatch**`

The `allMatch` method in Java Streams is used to check if all elements in the stream satisfy a given predicate. It returns `true` if every element in the stream matches the predicate, and `false` otherwise.

**Short-Circuiting:** The `allMatch` operation is short-circuiting, meaning it stops processing as soon as it finds the first element that does not match the predicate. If it finds such an element, it immediately returns `false`.

**Question:** Check if all numbers in a list are positive.

### `**anyMatch**`
The `anyMatch` method checks whether **at least one element** in the stream matches a given predicate. It returns `true` as soon as it finds an element that satisfies the predicate and stops further processing. If no elements match, it returns `false`

`anyMatch` is short-circuiting, meaning it stops processing as soon as it finds the first element that matches the predicate, optimizing performance.

### `**noneMatch**`

The `noneMatch` method in Java Streams is used to check if **no elements** in the stream match a given predicate. It returns `true` if none of the elements satisfy the predicate and `false` if at least one element does.

Like `allMatch` and `anyMatch`, `noneMatch` is short-circuiting. It stops processing as soon as it finds the first element that matches the predicate and immediately returns `false`

**Question:** Check if no elements in a list are negative.

### `**findFirst**`
is used to retrieve the **first element** in a stream that matches a given condition or simply the first element in the stream if no filtering is applied. It returns the first element wrapped in an `Optional`, which is a container object that may or may not contain a non-null value.

Mock Interview Playlist:

Java 8 Interview Questions and Answers:

Hibernate Interview Questions and Answers:

Spring Boot Interview Questions and Answers:

Angular Playlist:

Subscriber and Follow Code Decode

#java8 #codedecode #interviewquestions

[rahulprajapati]

yes...please come up with 2nd video in this topic, that's very helpful,
Thank you Code-Decode team

[Vyshnavi-em]

Best video to revise stream fucntions before attending an interview 😊
Thank you CodeDecodd 🎉

[filmy]

Please release 2nd part for remaining...knowledgeable, simlified video

[sayanbiswas]

Very important topic. Thank you so much team. Keep more such videos coming 👏👏👏

[vaibhavkalyankar]

Excellent ma'am 😊 waiting for second part

[muni]

Please solve interview questions so that we have that logic and experience idea

[dharamveerrathore]

thx, it's beneficial, am waiting for 2nd part

[cse-bthorlikonda.sudhee]

Thankful and We need interview based questions and answers

[NandkishorPatil-ests]

Simple and effective method of teaching, Thank you!!
Please create 2nd part!!

[padminigajulapalli]

Very informative..thanks for posting mam..we are expecting videos frequently from you..😊

[akshaypatil]

Thank you for video. Please come up with second part with more complex operations using java8

[physrivdos]

Really exhaustive coverage, it has taken me many hours trying to take notes and also try out the samples Qs/ Use cases etc. But it is really worth the effort, because at the end of each section, I am able to understand thoroughly. Really appreciate the gr8 effort & planning that has gone into this video.
Please keep up this gr8 job. 🙏💕🎈💪

[keerthanashiyam]

Thank you so much for the video. Great work

[saisree]

Please create a 2nd video i am preparing for interview. Your channel helped me a lot in grooming my skills

[vineethkumar]

This is awesome. Waiting for the second part. As @akshaypatil310 already mentioned come up with with more complex operations using java8.

[jaswantshergill]

Very good video. When is second part coming?

[sitarammaharana]

Please release 2nd part. That really helps

[AgyaanSeGyaanTak]

please make 2nd part and thank you for this.❤

[mallepallinavee]

thanks for the video..waiting for 2nd part.. please share the document, it will be useful for us

[TempUse-oh]

Please help on 2nd part and this is really useful.. thanks for helping the people..