J2ME试题汇总.doc

1．下面的哪个包包含由MIDP支持的GUI组件？ ?1. javax.microedition.MIDlet???????? 2. javax.microedition.io ?3. javax.microedition.rms????????????4. javax.microedition.lcdui 2．思考下面的代码： import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class Hello extends MIDlet { ????????private Display Exhibit; ????????private Form show; ????????public Hello() ????????{ ????????????????Exhibit = Display.getDisplay(this); ????????????????show = new Form(Name); ????????} ????????public void startApp() throws MIDletStateChangeException ????????{ ????????????????disp.setCurrent(show); ????????} ????????public void pauseApp() ????????{ ????????} ????????public void destroyApp(boolean unconditional) ????????{ ????????} } 下面的哪个代码段应该被增加到上述的代码中来创建一个字符串项并将它显示在屏幕上？ ?1. StringItem strIt = new StringItem( , Msg); StringItem.append(strIt); ?2. StringItem strIt = new StringItem( , Msg); show.append(strIt); ?3. show = new StringItem( , Msg); StringItem.append(strIt); ?4. StringItem strIt = new StringItem( , Msg); StringItem.append(show); 3．你正在为一个银行程序开发一个MIDlet。当客户向银行发送一个请求时，一个进程指示将一直显示，直到请求被处理完为止。进程指示应该被嵌入到form组件中。下面?的哪个方法可以在设备屏幕上显示进程指示？。 ?1. public void showGauge() { Form form = new Form(“Gauge”); Gauge gauge = new Gauge (“Progress”, false, 100, 0); form.append (gauge); Display display = Display.getDisplay(this); display.setCurrent(form); } ?2. public void showGauge() { Gauge gauge = new Gauge (“Progress”, false, 100, 0); Display display = Display.getDisplay(this); display.setCurrent(gauge); } ?3. public void showGauge() { Form form = new Form(“Gauge”); Gauge gauge = new Gauge (“Progress”, false, 100, 0); form.append (gauge); Display.setCurrent(form); } ?4. public void showGauge() { Form form = new Form(“Gauge”); Gauge gauge = new Gauge (“Progress”, false, 100, 0); form.append (gauge); Display display = Display.getCurrent(form); display.setCurrent(gauge); } 4.在J2ME中，下面的哪个包可以使用网络连接？P3.4 ?1. javax.microedition.midlet ?2. javax.microedition.lcdui ?3. javax.microedition.io ?4. java.io 5.你正在编