Write a java program to demonstrate applet life cycle
Applet life cycle in java program
Event Handling Applets inherit a group of event-handling methods from the Container class. Following are the specific steps for converting an application to an applet. Now Html file is not required but it is for testing purpose only. Applet class For creating any applet java. Java Plug-in software. It is invoked when Applet is stop or browser is minimized. Those implementations may be overridden as necessary. It is invoked only once. Inside paint is a call to drawString , which is a member of the Graphics class. It provides Graphics class object that can be used for drawing oval, rectangle, arc etc. MouseEvent; import java. This applet displays a checkerboard pattern of black and a second color. It is called automatically when the applet is first loaded into the browser and is called only once during the life cycle of the applet.
Do not construct a frame window for the application. After you create this html file, you can use it to execute the applet.
Therefore, parseSquareSize catches exceptions, rather than allowing the applet to fail on bad input. By appletViewer tool for testing purpose. The only method overridden is the paint method. This method is defined by the AWT and must be overridden by the applet. Notice that the applet does not have a main method. Graphics class. You will most likely need to implement only the init method at a minimum. Java Plug-in software. Lifecycle methods for Applet: The java. Make an HTML page with the appropriate tag to load the applet code. Unlike the init method, the start method may be called more than once during the life cycle of an applet. Component class The Component class provides 1 life cycle method of applet. MouseEvent; import java. How to run an Applet? Inside paint is a call to drawString , which is a member of the Graphics class.
The browser ignores text and other tags between the applet tags. Therefore, anything that appears between the tags, not related to the applet, is visible in non-Java-enabled browsers.
How to make a java applet
Inside HelloWorld, paint is declared. The viewer or browser looks for the compiled Java code at the location of the document. It can, therefore, be called repeatedly in the same applet. If the application calls setTitle, eliminate the call to the method. It is invoked when Applet is stop or browser is minimized. Otherwise, the applet cannot be loaded. An applet is a Java program that runs in a Web browser. An applet can be a fully functional Java application because it has the entire Java API at its disposal. Unlike Java programs, applets do not begin execution at main. Graphics class. This class must be declared as public because it will be accessed by code that is outside the program.
MouseListener; import java. You need to implement these methods to make this applet work. It may also get its parameters in the paint method.
The viewer or browser looks for the compiled Java code at the location of the document. Move any initialization code from the frame window constructor to the init method of the applet. Using an applet viewer, such as the standard tool, applet-viewer.
If the application calls setTitle, eliminate the call to the method.
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