import javax.microedition.midlet.*; import javax.microedition.lcdui.*; publicclassMidletextendsMIDlet {publicvoid startApp() { Display.getDisplay(this).setCurrent(new a()); } publicvoid pauseApp() { } publicvoid destroyApp(boolean unconditional) { } } classaextendsCanvas{int transy; int w,h; String s; Font f; public a(){ transy=0; setFullScreenMode(true); w=getWidth(); h=getHeight(); s="test scrolling on canvas"; } publicvoid paint(Graphics g){ f=Font.getDefaultFont(); int lw=f.getHeight(); g.setColor(0); g.fillRect(0,0,w,h); g.setColor(255,0,0); g.translate(0,transy); for(int i=0;i<300;i++){ g.drawString(s+" "+i,0,i*lw,Graphics.TOP|Graphics.LEFT);} if(transy>0)transy=0; repaint(); } protectedvoid keyPressed(int k){ if(k==-1||k==50)transy+=10; if(k==-2||k==56)transy-=10; if(k==-3||k==52)transy+=h; if(k==-4||k==-54)transy-=h; repaint(); } }