Java 8 🔥 | Programming Interview Questions & Answers | Stream API | Java Techie 

Glad to hear this Amol 😍. Congratulations for your achievements and keep learning 😃

Sure Aadi 😜. Then RU-vid is Broker

@@Javatechie No youtube is kafka server

@@Javatechie

Thanks buddy i will

​@@Javatechie Please create a java 8 code to find sub string with maximum repeating characters

Thanks Vinoth 🤗

Yes buddy it's in a queue. Will upload within a month

​@@Javatechieyes we are waiting

This will give you a unique element not duplicate

🤪🤪🤪🤪

For what much experience

Yes buddy next weekend i will upload 2 videos on Kafka.

@@Javatechie please complete the series . Waiting since long for your Kafka series .❤️

Okay i will do that

Check isEmpty or offNullable in optional then get the object that is the correct way to deal with optional

@@Javatechie thanks a lot sir.

Yes buddy programming questions is common for any experience

Please check out my Kafka playlist

In my opinion documentation and there are also good books out there

Practice a few more basic programs and then try to convert it to java 8 stream and play with it . You will explore more and more once you start playing with it . To be fair i don't use documentation to learn rather i tried to understand various scenarios by debugging source code

Functional programming does not improve the performance of any system. it has the same complexity as writing a conventional imperative style of programming. The only advantage streams and functional programming generally present is, clean, concise and easy to read code.

@@oludamilareolukotun9929 which one best

@@bhavanisankar71 Functional style is better. Take a look at the 2 styles for removing duplicate below. You will see functional is easy to read and clean FOR LOOP FOR GETTING DUPLICATE public static List getDuplicateForLoopStyle(List strings){ Map maps = new HashMap(); for (String s : strings){ if (!maps.isEmpty() && maps.containsKey(s)){ int value = maps.get(s); maps.put(s,++value); }else maps.put(s,1); } List result = new ArrayList(); for (Map.Entry entry : maps.entrySet()){ if (entry.getValue() > 1){ result.add(entry.getKey()); } } return result; } FUNCTIONAL STYLE FOR GETTING DUPLICATE public static List getDuplicateFunctionalStyle(List strings){ return strings.stream() .collect(Collectors.groupingBy(x -> x, Collectors.counting())) .entrySet() .stream() .filter(x -> x.getValue() > 1) .map(Map.Entry::getKey) .collect(Collectors.toList()); }

Okay i will do that buddy

Please share some sample inputs

No we need to give a new object of LinkedIn hashmap . Pass as constructor or method reference it's upto you

Yes i will

@@Javatechie bhai Ghar kouthi....

Try this public static String removeAdjacentDuplicates(String input) { return input.chars() .mapToObj(c -> (char) c) .collect(StringBuilder::new, (sb, c) -> { if (sb.length() == 0 || sb.charAt(sb.length() - 1) != c) { sb.append(c); } }, StringBuilder::append) .toString(); }

@@Javatechie thank you for your response

You can achieve this using Java 8 streams. Here's a Java program that takes the input "a2b2c1d3" and produces the output "aabbcddd" using streams: ```java import java.util.stream.Collectors; public class Main { public static void main(String[] args) { String input = "a2b2c1d3"; String output = decodeString(input); System.out.println(output); } public static String decodeString(String input) { return input.chars() .mapToObj(c -> (char) c) .collect(StringBuilder::new, (sb, c) -> { if (Character.isLetter(c)) { sb.append(c); } if (Character.isDigit(c)) { int count = Character.getNumericValue(c); char prevChar = sb.charAt(sb.length() - 1); for (int i = 0; i < count - 1; i++) { sb.append(prevChar); } } }, StringBuilder::append) .toString(); } } ``` This program uses streams to process the input string character by character and builds the desired output. When you run it with the input "a2b2c1d3," it will produce the output "aabbcddd."

why not stream?

@@oludamilareolukotun9929 it's slower with streams unless you have a very large dataset in the array, like 1,000 elements, otherwise for loop and just using collections is faster performance

Then why companies are still using java8

It will internally use a hashmap so we can't expect an insertion order . That's why I explained in video what to do check and apply