On-machine topics (beginner)-Snowball (Java)

The last section realizes the effect of the stars, this section will implement a small instance of Snowball, here to use the redrawing and threading knowledge, the code is as follows:

Import Java.awt.color;import java.awt.frame;import Java.awt.graphics;import Java.awt.panel;public class SnowBall { public static void Main (string[] args) {frame frame=new frame (); Frame.setbackground (Color.Black); Frame.setsize (1024, 768); Mypanel mypanel=new Mypanel (); Frame.add (Mypanel); Thread thread=new thread (mypanel); Thread.Start (); Frame.show ();}} Class Mypanel extends Panel implements Runnable{int X=120;int y=10; @Overridepublic void Paint (Graphics g) {G.setcolor (Col Or. white); G.filloval (x, Y, 20, 20);} @Overridepublic void Run () {while (true) {y++;if (y>768) {y=0;} Repaint ();}}}

At this point the run found the small ball does not move, but it is not the problem of the code, because the CPU is running too fast, here we can let the thread sleep for a while to execute the next time, in the while add:

try {thread.sleep;} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}

Run the instance again to see that the ball is constantly falling.

On-machine topics (beginner)-Snowball (Java)