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create forum site web create forum site web Applets have various ways of drawing, or displaying, their content. This applet, a very simple one that has only text, uses the method drawString (part of the Graphics class) to display its text. The method drawString takes three arguments: (1) the string to be displayed, (2) the x coordinate, indicating the horizontal starting point for displaying the string, and (3) the y coordinate, indicating the vertical starting point for displaying the string (which is below the text). The method paint is what actually displays something on the screen, and in OutputApplet.java , it is defined to contain calls to the method drawString .

create forum site web The main thing drawString displays is the contents of the Vector results (the stored query results). When there are no query results to display, drawString will display the current contents of the String message . This string will be "Initializing" to begin with. It gets set to "Connecting to database" when the method start is called, and the method setError sets it to an error message when an exception is caught. Thus, if the database connection takes much time, the person viewing this applet will see the message "Connecting to database" because that will be the contents of message at that time.

create forum site web (The method paint is called by AWT when it wants the applet to display its current state on the screen.) The last two methods defined in the class OutputApplet, setError and setResults are private, which means that they can be used only by OutputApplet repaint , which clears the screen and calls paint . So if setResults calls repaint , the query results will be displayed, and if setError calls repaint , an error message will be displayed. A final point to be made is that all the methods defined in OutputApplet except run are synchronized . The keyword synchronized indicates that while a method is accessing an object, other synchronized methods are blocked from accessing that object.

create forum site web

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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create forum site web