Eng Jav — Dass 341

DASS 341 ENG JAV: A Complete Guide to the Integrated Course

Sample exam-style questions (with brief answers)

1. Explain difference between synchronized and ReentrantLock. — ReentrantLock offers tryLock, interruptible lock acquisition, and explicit unlocking.
2. Write code to count word frequency in a large file using streams. — use Files.lines(path).flatMap(...).collect(Collectors.groupingBy(..., Collectors.counting())).
3. How does ConcurrentHashMap avoid global locks? — Segmentation/bucket-level concurrency and CAS-based updates (implementation details vary by Java version).
4. Design class diagram for producer-consumer with bounded buffer. — use BlockingQueue, producers call put(), consumers take().

Unit 1: Algorithm Analysis & Big O Notation

• English terminology: Time complexity, space complexity, asymptotic analysis.
• Java implementation: Writing benchmarks using System.nanoTime().

Unit 3: Fundamental Data Structures

• Arrays and ArrayLists: Dynamic resizing in Java.
• Linked Lists: Singly, doubly, and circular implementations.
• Stacks and Queues: Using Deque interface and ArrayDeque.

5) Networking & sockets

• TCP sockets (ServerSocket, Socket), basic client-server pattern.
• HTTP libraries (HttpClient in Java 11+), handling timeouts and redirects.
• Serialization over network (object streams vs JSON).
• Example: simple HttpClient

HttpRequest req = HttpRequest.newBuilder(URI.create(url)).GET().build();
HttpResponse<String> resp = HttpClient.newHttpClient()
  .send(req, BodyHandlers.ofString());

8. Why "ENG JAV" Matters

The ENG JAV section is unique because it is:

• Taught in English to accommodate global J&J affiliates and international participants.
• Hosted at the Janssen campus (JAV) – offering direct access to industry experts, real‑world case studies (e.g., STELARA, DARZALEX trial data), and networking with Janssen biostatisticians.
• Hands‑on with proprietary data (anonymized historical trial data) – unlike generic academic courses.

Participants often use this course as a stepping stone to J&J internal certifications in clinical data science. dass 341 eng jav

Major topics (by weight)

1. Java language features & best practices (15%)
2. Collections, generics, and streams (15%)
3. Concurrency & multithreading (20%)
4. I/O, serialization, and NIO (10%)
5. Networking & sockets (10%)
6. Design patterns & architecture (10%)
7. Testing, debugging, and profiling (10%)
8. Build tools, modules, and deployment basics (10%)

3. English Proficiency in Tech

The “ENG” component is critical. Technical documentation, Stack Overflow discussions, and research papers are predominantly in English. This course conditions students to think, write comments, and explain solutions in professional technical English. DASS 341 ENG JAV: A Complete Guide to