We did added four key things to Mondrian to make it threaded and a lot more CPU friendly.

1. We specified that our applet implements Runnable.
2. We added a run method.
3. We added a start method.
4. We added a stop method.

Let's look at them in more detail:

Our applet implements Runnable Run Method Start Method Stop Method Here's a threaded version of Flying Lines.

//Bounce lines around in a box import java.applet.Applet; import java.awt.*; public class FlyingLines extends Applet implements Runnable { int NUM_LINES = 25; int gDeltaTop=3, gDelta=3; int gDeltaLeft=2, gDeltaRight=6; int Applet, Applet; int gLines[][] = new int[NUM_LINES][4]; public void init() { Applet = size().; Applet = size().; } public void start() { gLines[0][0] = Randomize(Applet); gLines[0][1] = Randomize(Applet); gLines[0][2] = Randomize(Applet); gLines[0][3] = Randomize(Applet); for (int i=1; i < NUM_LINES; i++ ) { LineCopy(i, i-1); RecalcLine(i); } repaint(); Thread t = new Thread(this); t.start(); } public void run () { Thread.currentThread().setPriority(Thread.MIN_PRIORITY); while (true) { for (int i=NUM_LINES - 1; i 0; i--) { LineCopy(i, i-1); } RecalcLine(0); System.out.println(gLines[0][0] + , + gLines[0][1] + ,+ gLines[0][2] + , + gLines[0][3]); repaint(); try { Thread.currentThread().sleep(10); } catch (Exception e) { } } } public void paint(Graphics g) { for (int i=0; i < NUM_LINES; i++) { g.drawLine(gLines[i][0], gLines[i][1], gLines[i][2], gLines[i][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] Applet)) { gDeltaTop *= -1; gLines[i][1] += 2*gDeltaTop; } gLines[i][3] += gDelta; if ( (gLines[i][3] < 0) || (gLines[i][3] Applet) ) { gDelta *= -1; gLines[i][3] += 2*gDelta; } gLines[i][0] += gDeltaLeft; if ( (gLines[i][0] < 0) || (gLines[i][0] Applet) ) { gDeltaLeft *= -1; gLines[i][0] += 2*gDeltaLeft; } gLines[i][2] += gDeltaRight; if ( (gLines[i][2] < 0) || (gLines[i][2] Applet) ) { gDeltaRight *= -1; gLines[i][2] += 2*gDeltaRight; } } //RecalcLine ends here } // FlyingLines ends here