zxing barcode reader java example Multithreading in Java

Painting ECC200 in Java Multithreading

Multithreading
Painting Data Matrix ECC200 In Java
Using Barcode generation for Java Control to generate, create ECC200 image in Java applications.
DataMatrix Recognizer In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
hboxadd(jspSampleRate); jfrmadd(hbox); // Display the frame jfrmsetVisible(true); // Start the timer Each time the timer goes off // the monitor display is updated thrdTimerstart(); } // Update the information about the thread void updateStatus() { jlabNamesetText("Thread Name: " + thrdgetName()); jlabStatesetText("Current State: " + thrdgetState()); jlabAlivesetText("Thread Alive: " + thrdisAlive()); jlabPrisetText("Current Priority: " + thrdgetPriority()); } }
Barcode Printer In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
Bar Code Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
The code is straightforward, and the comments describe each step Here are a few highlights When a ThreadMonitor is created, it must be passed a reference to the thread to be monitored This reference is stored in the thrd instance variable Next, the monitor s GUI is created Notice that a spinner is used to set the sample rate This is the rate at which the display is updated This rate is initially set to 100 milliseconds, but you can change the rate during execution The range is limited to 10 to 5,000 milliseconds, but you can expand this if you like The sample rate is used to set the delay period of a Swing timer, which is an instance of javaxswingTimer Each time the timer goes off, an action event is sent to all of the timer s registered action listeners In this case, there is only one listener It handles the timer s action event by calling updateStatus( ), which updates the GUI to reflect the current state of the thread
Data Matrix Creation In Visual C#
Using Barcode creator for .NET framework Control to generate, create ECC200 image in VS .NET applications.
ECC200 Encoder In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
NOTE For information about, and recipes that use, Swing, see 8
Paint ECC200 In Visual Studio .NET
Using Barcode drawer for VS .NET Control to generate, create Data Matrix image in .NET framework applications.
Printing Data Matrix In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix image in .NET framework applications.
You can put the thread monitor into action by substituting this version of ThreadStateDemo into the previous example program (You will also need to have the program import javaxswing*) Instead of showing the status of a thread on the console, it shows the status in real time, in the monitor s window
Make Code 3/9 In Java
Using Barcode creation for Java Control to generate, create Code 39 Extended image in Java applications.
Create EAN-13 Supplement 5 In Java
Using Barcode encoder for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
// This version of ThreadStateDemo uses a ThreadMonitor // to report a thread's name, state, and priority in real time class ThreadStateDemo { public static void main(String args[]) { try {
Paint Data Matrix In Java
Using Barcode maker for Java Control to generate, create ECC200 image in Java applications.
GS1 DataBar Expanded Maker In Java
Using Barcode creation for Java Control to generate, create GS1 DataBar Limited image in Java applications.
Herb Schildt s Java Prog ramming Cookbook
USPS Confirm Service Barcode Printer In Java
Using Barcode creation for Java Control to generate, create USPS PLANET Barcode image in Java applications.
Code 128A Drawer In None
Using Barcode printer for Software Control to generate, create Code 128 Code Set C image in Software applications.
// Construct a MyThread object MyThread mt = new MyThread(); final Thread thrd = new Thread(mt, "MyThread #1"); // Create the thread monitor Because ThreadMonitor creates // a Swing GUI, ThreadMonitor must be instantiated on // the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new ThreadMonitor(thrd); } }); // Use sleep() here and elsewhere to slow down // execution in order to allow the various // thread states to be seen Threadsleep(3000); // Start the thread thrdstart(); Threadsleep(3000); // Show state of a thread waiting on wait() mtholding = false; // let MyThread #1 enter call wait() Threadsleep(3000); // Change the thread's priority Systemoutprintln("Changing the thread's priority"); thrdsetPriority(ThreadNORM_PRIORITY-2); Threadsleep(3000); // Change the thread's name to MyThread ALPHA Systemoutprintln("Changing name to MyThread ALPHA"); thrdsetName("MyThread ALPHA"); Threadsleep(3000); // Let the thread move on by calling notify() // This lets MyThread #1 go to sleep mtn(); Threadsleep(3000); Systemoutprintln("Main thread ending"); } catch(InterruptedException exc) { Systemoutprintln("Main thread interrupted"); } } }
UCC-128 Scanner In VB.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
UPC Code Decoder In VB.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
7:
UPC Symbol Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Generating ECC200 In Visual Basic .NET
Using Barcode maker for .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Multithreading
Scanning Bar Code In Visual Basic .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
UPC-A Supplement 2 Creator In Java
Using Barcode drawer for Eclipse BIRT Control to generate, create UPC Symbol image in BIRT reports applications.
A sample of the monitor s window is shown here:
Here are some enhancements that you might want to try adding First, add a spinner that lets you set the priority of the thread being monitored Thus, in addition to displaying the thread s priority, you can set it This feature would let you experiment with different priorities, helping you tune the thread s execution characteristics Second, try adding buttons that suspend, resume, and stop the thread Third, you might want to display when the thread is interrupted Finally, you might want to indicate if the thread is a user or a daemon
Options and Alternatives
Although not often needed, there is one other piece of thread-related information that can be useful in some cases: the lock status of an object For example, when debugging multithreaded code, it can occasionally be useful to know if a thread holds the lock on some object This question can be answered by calling holdsLock( ), shown here: static boolean holdsLock(Object obj) The object in question is passed in obj If the calling thread holds that object s lock, then holdsLock( ) returns true Otherwise, it returns false
Copyright © OnBarcode.com . All rights reserved.