Ticker类的练习

其实这个目前没什么难的，就是用来熟悉一下java语句，加深一下对类的理解，同时，学这个又有点趣味性，很容易上手，也许到后面会有一些挑战性，但是我很期待挑战！

Ticker类用来显示一个可以连续滚过屏幕的字符串，一个Ticker对象可以在多个屏幕之间实现共享。

下面是Ticker类的练习代码：

import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;import javax.microedition.lcdui.*;public class TickerDemo extends MIDlet implements CommandListener {private Display display;private Ticker ticker;private TextBox textBox1;private TextBox textBox2;private Command cmdExit=new Command("退出",Command.CANCEL,1);private Command cmdNext=new Command("下一步",Command.SCREEN,1);private Command cmdBack=new Command("上一步",Command.BACK,1);public TickerDemo() {// TODO Auto-generated constructor stubdisplay=Display.getDisplay(this);ticker=new Ticker("飘过…… ");textBox1=new TextBox("呆呆","呆，想看下一个屏幕不想？按下一步！",50,0);textBox1.setTicker(ticker);//给文本框添加滚动条textBox1.addCommand(cmdExit);textBox1.addCommand(cmdNext);textBox1.setCommandListener(this);textBox2=new TextBox("呆呆","老婆，我爱你！嘿嘿……",50,0);textBox2.setTicker(ticker);textBox2.addCommand(cmdExit);textBox2.addCommand(cmdBack);textBox2.setCommandListener(this);}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {// TODO Auto-generated method stub}protected void pauseApp() {// TODO Auto-generated method stub}protected void startApp() throws MIDletStateChangeException {// TODO Auto-generated method stubdisplay.setCurrent(textBox1);}public void commandAction(Command arg0, Displayable arg1) {// TODO Auto-generated method stubif(arg0==cmdNext){display.setCurrent(textBox2);}else if(arg0==cmdBack){display.setCurrent(textBox1);}else{try {destroyApp(false);} catch (MIDletStateChangeException e) {// TODO Auto-generated catch blocke.printStackTrace();}notifyDestroyed();}}}