Low-Level API In contrast to the high-level API, the low-level API allows full control of the MID display at pixel level. For this purpose, the lcdui package contains a special kind of screen called Canvas. The Canvas itself does not provide any drawing methods, but it does provide a paint() callback method similar to the paint() method in AWT components. Whenever the program manager determines that it is necessary to draw the content of the screen, the paint() callback method of Canvas is called.

J2ME Programming (Part I). First notice that in addition to text boxes, there are three other types of screens: alerts. MIDP provides a. Posts about Calculator program using J2ME written by Alka Tank. Java program which performs basic arithmetic operations addition, subtraction, multiplication and division. Displaying search result for: addition and subtraction using swing in Java. Java swing how to create simple addition program using java swing?

The only parameter of the paint() method is a Graphics object. In contrast to the lcdui high-level classes, there are many parallels to AWT in the low-level API.

The Graphics object provides all the methods required for actually drawing the content of the screen, such as drawLine() for drawing lines, fillRect() for drawing a filled rectangular area or drawstring() for drawing text strings. In contrast to AWT, lcdui does not let you mix high-level and low-level graphics. Curerom Daemon Tools Lite on this page. It is not possible to display high-level and low-level components on the screen simultaneously. The program manager knows that it must call the paint() method of Canvas when the instance of Canvas is shown on the screen.

However, a repaint can also be triggered by the application at any time. By calling the repaint() method of Canvas, the system is notified that a repaint is necessary, and it will call the paint() method.

The call of the paint() method is not performed immediately; it may be delayed until the control flow returns from the current event handling method. The system may also collect several repaint requests before paint() is actually called. This delay normally is not a problem, but when you're doing animation, the safest way to trigger repaints is to use Display.callSerially() or to request the repaint from a separate Thread or TimerTask. Alternatively, the application can force an immediate repaint by calling serviceRepaints().

(For more information, see the section 'Animation' at the end of this chapter.).

Simple addition program.: Console Read « Development « Python • • • • Simple addition program. # prompt the user for input integer1 = raw_input( 'Enter first integer: n' ) # read a string integer1 = int( integer1 ) # convert the string to an integer integer2 = raw_input( 'Enter second integer: n' ) # read a string integer2 = int( integer2 ) # convert the string to an integer sum = integer1 + integer2 # assignment of sum print 'Sum is', sum # print sum Related examples in the same category 1.

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