为了查看各种各样的手机对Java的支持情况，特地编写了本程序。
程序是用J2ME开发的，很简单，只有两个类，编译打包成.jar文件后即可在手机上运行。
入口类
(资料图)
package org;
import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
public class ViewMidlet extends MIDlet{
private J2MEInfo info;
public ViewMidlet(){
info=new J2MEInfo(this);
}
public Display getDisplay(){
return Display.getDisplay(this);
}
public void startApp() {
getDisplay().setCurrent(info);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}
处理类
package org;
import javax.bluetooth.LocalDevice;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
public class J2MEInfo extends Form implements CommandListener {
private ViewMidlet main;
private Command about;
private Command exit;
public J2MEInfo(ViewMidlet main) {
super("手机J2ME属性");
this.main=main;
init();
}
/**
* 初始化参数
*/
private void init() {
about = new Command("关于", Command.OK, 1);
exit = new Command("退出", Command.EXIT, 1);
this.addCommand(about);
this.addCommand(exit);
this.setCommandListener(this);
display();
}
/**
* 显示J2ME属性
*/
private void display() {
String[] keys = {"平台：", "编码：", "MIDP：", "CLDC：", "PIM：", "文件系统："};
String[] values = {"microedition.platform", "microedition.encoding", "microedition.profiles",
"microedition.configuration", "microedition.pim.version", "microedition.io.file.FileConnection.version"};
for (int i = 0; i < keys.length; i++) {
StringItem item = new StringItem(keys[i], getInfo(1, values[i]));
this.append(item);
}
StringItem item2 = new StringItem("蓝牙：", getInfo(2, "bluetooth.api.version"));
this.append(item2);
}
/**
* 获取J2ME属性
* @param type 1代表从System类获取属性,2代表从LocalDevice类获取属性
* @param property 属性名
* @return 支持的版本号
*/
private String getInfo(int type, String property){
String value = null;
if(type == 1){
value = System.getProperty(property);
}else{
value = LocalDevice.getProperty(property);
}
if(value == null || value.trim().equals(""))
return "不支持";
else
return value;
}
public void commandAction(Command c, Displayable d) { if (c == about) { main.getDisplay().setCurrent(new Alert("关于/n", "手机J2ME属性/n版本：1.0.2",null,AlertType.INFO), this); } else if (c == exit) { main.notifyDestroyed(); main.destroyApp(true); } }}
