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private java server pages width; AppletHeight = size().height; } public void start() { gLines[0][0] = Randomize(AppletWidth); gLines[0][1] = Randomize(AppletHeight); gLines[0][2] = Randomize(AppletWidth); gLines[0][3] = Randomize(AppletHeight); for (int i=1; i < NUM_LINES; i++ ) { LineCopy(i, i-1); RecalcLine(i); } repaint(); } public void paint(Graphics g) { while (true) { for (int i=NUM_LINES - 1; i > 0; i--) { LineCopy(i, i-1); } RecalcLine(0); g.setColor(Color.black); g.drawLine(gLines[0][0], gLines[0][1], gLines[0][2], gLines[0][3]); g.
private java server pages setColor(getBackground()); g.drawLine(gLines[NUM_LINES-1][0], gLines[NUM_LINES-1][1], gLines[NUM_LINES-1][2], gLines[NUM_LINES-1][3]); } } private void LineCopy (int to, int from) { for (int i = 0; i < 4; i++) { gLines[to][i] = gLines[from][i]; } } public int Randomize( int range ) { double rawResult; rawResult = Math.random(); return (int) (rawResult * range); } private void RecalcLine( int i ) { gLines[i][1] += gDeltaTop; if ((gLines[i][1] < 0) || (gLines[i][1] > AppletHeight)) { gDeltaTop *= -1; gLines[i][1] += 2*gDeltaTop; } gLines[i][3] += gDeltaBottom; if ( (gLines[i][3] < 0) || (gLines[i][3] > AppletHeight) ) { gDeltaBottom *= -1; gLines[i][3] += 2*gDeltaBottom; } gLines[i][0] += gDeltaLeft; if ( (gLines[i][0] < 0) || (gLines[i][0] > AppletWidth) ) { gDeltaLeft *= -1; gLines[i][0] += 2*gDeltaLeft; } gLines[i][2] += gDeltaRight; if ( (gLines[i][2] < 0) || (gLines[i][2] > AppletWidth) ) { gDeltaRight *= -1; gLines[i][2] += 2*gDeltaRight; } } //RecalcLine ends here} // FlyingLines ends hereTaking Action: ThreadsDepending on your operating system and Java-enabled browser you may have noticed that the Mondrian and Flying Line programs tended to hog your CPU. On Windows NT HotJava stopped responding to my commands several thousand iterations into Mondrian, and I had to kill it from the Task List.The paint loops in both Mondrian and FlyingLines are ideal for a thread, a separate stream of execution that takes place simultaneously and independently of everything else that might be happening (like responding to the programmer's insistence to "Quit!, Damnit!").
private java server pages Without threads an entire program can be held up by one CPU intensive task or, as in Flying Lines, one infinite loop, intentional or otherwise.As a general rule all CPU intensive tasks should be placed in their own threads. Here's one way to do it.//Draw infinitely many random rectanglesimport java.applet.
private java server pages
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