Java Tutorials - Herong's Tutorial Examples

∟ThreadGroup Class and "system" ThreadGroup Tree

This chapter provides tutorial notes and tutorial examples on the ThreadGroup class and the 'system' ThreadGroup tree. Topics include main methods of the ThreadGroup class, displaying the 'system' ThreadGroup tree, adding threads and thread groups, testing the reported JDK 1.3 bug - memory leak of unstarted threads.

"ThreadGroup" Class - Container of Threads and Thread Groups

Displaying the "system" ThreadGroup Tree

Adding Threads and Thread Groups

Conclusion:

• Threads are organized into thread group trees in Java.
• JVM starts with 1 thread group called "system", which contains a child group called "main".
• Java application is running in the "main" thread under the "main" group.

Table of Contents

 About This Book

 JDK - Java Development Kit

 Execution Process, Entry Point, Input and Output

 Primitive Data Types and Literals

 Control Flow Statements

 Bits, Bytes, Bitwise and Shift Operations

 Managing Bit Strings in Byte Arrays

 Reference Data Types and Variables

 Enum Types and Enum Constants

 StringBuffer - The String Buffer Class

 System Properties and Runtime Object Methods

 Generic Classes and Parameterized Types

 Generic Methods and Type Inference

 Lambda Expressions and Method References

 Java Modules - Java Package Aggregation

 Execution Threads and Multi-Threading Java Programs

►ThreadGroup Class and "system" ThreadGroup Tree

 Synchronization Technique and Synchronized Code Blocks

 Deadlock Condition Example Programs

 Garbage Collection and the gc() Method

 Assert Statements and -ea" Option

 Annotation Statements and Declarations

 Java Related Terminologies

 Archived Tutorials

 References

 Full Version in PDF/EPUB

ThreadGroup Class and "system" ThreadGroup Tree - Updated in 2022, by Dr. Herong Yang