vb.net qr code reader free Installing an Applet in a Window in Visual Studio .NET

Reading QR Code in Visual Studio .NET Installing an Applet in a Window

Installing an Applet in a Window
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To install our applet in our new window, we have to create a new applet object; then we can install that applet object in the window In this case, we'll create a new object of our applet's class[md]the + class[md]and name that new object applet: import javaawt*;
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public class winapp extends javaappletApplet{
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public static void main(String args[])
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winappFrame frame = new winappFrame("The winapp application");
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frameresize(400, 300);
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winapp applet = new winapp();
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Next, we add the new applet object to the window using the window object's +method and centering the applet in the window: import javaawt*;
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public class winapp extends javaappletApplet{
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public static void main(String args[])
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winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
winapp applet = new winapp();
frameadd("Center", applet);
Now that we've installed the applet in the window, we can initialize the applet in preparation for displaying it
Calling the Applet's + and start() Methods
If we run the applet in a Web browser, the applet's environment calls the applet's + method actually starts the applet
Tip: The + method is where we can start additional threads if we want to make our program multitasking; a thread is a stream of execution and if we have multiple threads we can execute code in multiple locations in a program
In this example, we won't override either the applet's default + method, but we call those methods now to show how you start an applet after installing it in a window: import javaawt*;
public class winapp extends javaappletApplet{
public static void main(String args[])
winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
winapp applet = new winapp();
frameadd("Center", applet);
appletinit();
appletstart();
Finally, we show the window itself, using the + method: import javaawt*;
public class winapp extends javaappletApplet{
public static void main(String args[])
winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
winapp applet = new winapp();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
That's it[md]now our applet is created and running When it comes time to display it, the code in the + string: import javaawt*;
public class winapp extends javaappletApplet{
public static void main(String args[])
winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
winapp applet = new winapp();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void paint( Graphics g )
gdrawString( "Welcome to XML!", 60, 30 );
We're all done, except for one crucial task We still have to write the code for the window class, + (the class that takes the place of a Web browser for us)
Creating the winappFrame Window Class
The + class is the class for the window we display our applet in, and we'll write the code for that class now We can place the code for the new + class, which is the built-in Java window class: import javaawt*;
public class winapp extends javaappletApplet{
public static void main(String args[])
winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
winapp applet = new winapp();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void paint( Graphics g )
gdrawString( "Welcome to XML!", 60, 30 );
class winappFrame extends Frame
We'll write the code for this new window class now As you might recall, we passed the string we wanted to use as the window's title to the window's constructor when we created the window object in the + method: import javaawt*;
public class winapp extends javaappletApplet{
public static void main(String args[])
winappFrame frame = new winappFrame("The winapp application");
frameresize(400, 300);
To write the +[md]and pass this new method a Java String object: class winappFrame extends Frame
public winappFrame(String str)
That's how you write constructors[md]as class methods with the same name as the class itself (and
with no return value) In this case, we want to get the title for the window and install that in the window itself To install the title in the window, we simply pass that title to the +'s base class) How do we reach the + class' constructor this way: class winappFrame extends Frame
public winappFrame(String str)
super (str);
Now our window's constructor is all set We also want to let the user close the window smoothly, so we'll add code for that process next (if we didn't add code to let the user close the window, they'd have to end the program by pressing ^C or by terminating the program at the system level) When the user closes our window (using the close button in the title bar), Java passes a special value, + method We can intercept that message and close the window from code at that point Let's see how that works now First, we add the + method to the window class: class winappFrame extends Frame
public winappFrame(String str)
super (str);
public boolean handleEvent(Event evt)
We are passed an object of the Java Event class, which we name +, we should close our window This constant, +: class winappFrame extends Frame
public winappFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
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