Java Multi Thread Basics


1. Textbook questions (Summary – Divide – Summary)

Process (application, program) vs Thread (share memory)

Concurrency(progress at same time, some fast and others slow, single core) vs Parallelism (execute at same time, multi-core)

Runnable (interface) vs Threads (class)


2. Classic function interface: runnable, comparator


3. Class {

 Data field (property)

 Behavior (method)



4. Runnable is more flexible since it is a interface and can extend another class or implement other interfaces (Java has no multiple inheritance to avoid diamond problem)


5. Join: manage execution schedule (suspend parent thread)


6. notify() / notifyAll() -> ready


7. Synchronize – lock (class and instance level)


8. Reentry case (object lock for set and get methods, get / set can call set / get method)


9. System.out.println() and Debugger don’t help multi-thread problem debugging (it only prints relative order, print() is a thread, Debugger will hang all threads, need experience, small block)


10. Producer Consumer problem



11. JVM

Heap: 1 (x 1), shared public resource, object

Stack: multiple (x N), thread – stack, method – stack frame, object reference

Method Area: constant pool


12. Garbage Collection (GC)

What, how, why?

Advantage vs Disadvantages

Memory Leak (example, algorithm)



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Core Java Volume I–Fundamentals (10th Edition) (Core Series)

Core Java, Volume II–Advanced Features (10th Edition) (Core Series)

Test-Driven Java Development

Java Concurrency in Practice

Java: An Introduction to Problem Solving and Programming (7th Edition)

Java 9 for Programmers (Deitel Developer Series)

Java SE8 for the Really Impatient: A Short Course on the Basics (Java Series)

Core Java for the Impatient

Java: The Beginners Guide for every non-programmer which will attend you trough your learning process

Java Deep Learning Essentials

Machine Learning in Java

Learning Reactive Programming With Java 8

Java 9 Programming By Example

Thinking in Java (4th Edition)

The Java EE Architect’s Handbook, Second Edition: How to be a successful application architect for Java EE applications

Java Artificial Intelligence: Made Easy, w/ Java Programming


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Yao Li is a web and iOS developer, blogger and he has a passion for technology and business. In his blogs, he shares code snippets, tutorials, resources and notes to help people develop their skills. Donate $5 to him for a coffee with PayPal at About Me page and read more professional and interesting technical blog articles. Follow him @Yaoli0615 at Twitter to get latest tech updates.
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