🔥 Top 11 Java Stream API Problems You Must Know | Crack Interviews (1–5 Years Experience)

Are you a Java developer with 1 to 5+ years of experience preparing for technical interviews? This video covers 11 real-time Java Stream API problems that are frequently asked in interviews at top tech companies like TCS, Infosys, Accenture, Cognizant, and product-based startups.

We solve each problem using Java 8 Stream API with best practices and explanations — ideal for mid-level developers and experienced professionals looking to level up coding skills and crack Java interviews.

📘 Problems Covered in This Video:
1. Remove all vowels from a string
2. Convert a list of strings to uppercase using Stream
3. Count the frequency of each word in a string
4. Find the occurrence of each character in a string
5. Find the length of each word in a string
6. First non-repeating character in a string
7. First repeating character in a string
8. Find the second highest element in an array
9. Longest string in an array
10. Sum of digits from a number: int number = 1234563
11. Count total occurrences of a specific word from a list

💡 Why Watch This Video?
• ✅ Real-world Java problems using Stream API
• ✅ Prepare for mid-senior level interviews
• ✅ Improve Java 8 coding & problem-solving
• ✅ Suitable for 1–5+ years experienced developers

📌 Who Should Watch?
• Java Developers (1–5 years exp.)
• Candidates preparing for coding interviews
• Backend developers using Java 8 and above
• Mid-Level Engineers looking to refresh core Java skills

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[hemantanahak]

Please try to explain the methods that u have used for any kind of operation, so that it is easy to get clarity and purpose of that method.

[RishiRajxtrim]

10:25

I tried to get sorted map, but failed.

[satishdhaigude]

You took nice programs as per the interview view

[pravi]

5. Find length of each word in a string with insertion order.
String wordLengthStr = "Hello Happy Learning Champ Happy";
Map<String, Integer> map2 = "))
(oldValue, newValue) -> oldValue - merged function helps to accept duplicate words
LinkedHashMap::new - to maintain insertion order
.collect(Collectors.toMap(Function.identity(), String::length, (oldValue, newValue) -> oldValue, LinkedHashMap::new));
System.out.println(" word length : " + map2);