Rotating Colorful Disk
Once again, One more tutorial on Method communication. But here we need communication between Applet Life cycle methods and Thread-> run() method. To draw a disc, We have used 4 Arcs of 90 degrees each. For display color rotation, We have used Color[]. Rest everything is self explanatory. You may leave a comment in case you face any difficulty.
File Name: rotateArc.java
import java.applet.*; import java.awt.*; public class rotateArc extends Applet implements Runnable { Color[] clr = {Color.red, Color.green, Color.pink, Color.blue}; int cnt = 0; Thread t; public void init() { t = new Thread(this); t.start(); setBackground(Color.black); } public void run() { try { while(true) { repaint(); t.sleep(1000); cnt++; if(cnt>3){cnt=0;} } } catch(Exception e) { System.out.println(e); } } public void paint(Graphics g) { int tmp = cnt; for(int i=0;i<4;i++) { g.setColor(clr[tmp++]); if(tmp>3)tmp=0; g.fillArc(0,0,500,500,90*i,90); } } } /* <applet code="rotateArc" width="500" height="500"></applet> */
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