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| Tips ‘n’ Tricks |
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public boolean mouseDrag(Event e, int
endX, int endY)
{
Graphics g = getGraphics();
// Draw a line from start point to the
end point.
g.drawLine(startX, startY, endX, endY);
// Change the start point with the end
point.
startX = endX; startY = endY;
return true;
}}
MouseScribbling.html:
<HTML>
<BODY>
<APPLET CODE=”MouseScribbling”
WIDTH=”200"
HEIGHT=”300">
</APPLET>
</BODY>
</HTML>
Compile and Run:
C:\JavaJazzup>javac
MouseScribbling.
javaC:\JavaJazzup>appletviewer
MouseScribbling.html
Output:
Running the applet creates an applet
window like below where you can write
anything by pressing and dragging the
mouse. For instance, in the figure below
“Java” word is written in the applet
window. |
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7. Learn running external programs
(Notepad, Calculator, browser etc.) by
a Java program:
Opening any sub process like Notepad,
Calendar, browser etc from a java program
feels good for a new java programmer. The
class Runtime provides a static method
getRuntime(), which helps to work with
Java Runtime Environment. This is the only
way to get the reference to the Runtime
object. Now, by invoking its method exec(), external programs can be invoked. Here is a
simple demonstration for performing this
operation from a Java program.
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Sept 2007 | Java Jazz Up | 72 |
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