JFrame Thread Behavior with JDK 8 to 12

Java Swing Tutorials - Herong's Tutorial Examples

∟JFrame - Main Frame Class

∟JFrame Thread Behavior with JDK 8 to 12

This section provides a tutorial example on JFrame Thread behavior with JDK 1.8 to JDK 12.

I also tested the same program in JDK 8 to JDK 15. The result is different:

Test 1 - Run FrameThreads.java with JDK 15 in a command window and wait:

herong> java -version 
java version "15" 2020-09-15
Java(TM) SE Runtime Environment (build 15+36-1562)
Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)

herong> java FrameThreads.java
Active thread = main
Active thread = AWT-EventQueue-0
Interrupting thread = AWT-EventQueue-0

Noticed that the "AWT-Shutdown" and "AWT-Windows" threads are not there anymore. They are probably moved to the "system" thread group now from the "main" thread group. The interruption did sent to the AWT-EventQueue-0 threat. But the 3 Swing frames were displayed on the screen forever.

Test 2 - Run FrameThreads.java in a command window, hide 3 frames behind another window and wait. I got the same results as test 1.

This tells me that AWT packages in JDK 1.8 to JDK 15 are still having some issues if its threads are interrupted. But it behaves consistently now.

Table of Contents

About This Book

JDK (Java Development Kit)

Introduction of Java Swing Package

Graphics Environment of the Local System

►JFrame - Main Frame Class

Creating Frames with Sizes and Locations

Closing Frame and Terminating Application

Listing and Interrupting AWT Threads

"AWT blocker activation interrupted" Error in JDK 1.6

►JFrame Thread Behavior with JDK 8 to 12

Displaying Chinese Characters in Frame Title

Drawing Graphics - Using paint() on Frame

Drawing Graphics - Using paint() on Component

Drawing Graphics - Using paint() on Content Pane

Drawing Chinese Characters on Frames

JLabel - Swing Label Class

JButton - Swing Button Class

JCheckBox - Swing Check Box Class

JRadioButton - Swing Radio Button Class

JTextField - Swing Text Field Class

JComboBox - Swing Combo Box Class

Menu Bar, Menus, Menu Items and Listeners

Creating Internal Frames inside the Main Frame

Layout of Components in a Container

LookAndFeel and UIManager

Option Dialog Boxes

JEditorPane - The Editor Pane Class

SwingWorker - The Background Task Worker

AWT (Abstract Windows Toolkit)

Integration with Desktop System

Archived Tutorials

Full Version in PDF/EPUB