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<?php
Main::startApp();
/*
*入口类
*/
class Main
{
    public static function startApp()
    {
        $lyj = new WapLyj();
        try {
            $lyj->test();//调用方法
        } catch(MyError $e) {
            echo $e->toString();//捕获错误
        }
    }
    public static function pauseApp() { }
    public static function distroyApp() { }
}
/*
*类一
*/
class WapLyj
{
    var $url = '';
    public function test()
    {
        if ($this->url == '')
            throw new MyError('变量$url未初始化值为“www.waplyj.in”');//抛出错误
        else
            echo '变量$url的值为'.$this->url;
    }
}
/*
*类二
*/
class MyError extends Exception
{
    var $msg = '';
    function __construct($msg)
    {
        $this->msg = $msg;
    }
    public function toString()
    {
        return $this->msg;
    }
}
?>
J2ME code:
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Display;
import javax.microedition.io.ConnectionNotFoundException;
/*
*入口类
*/
public class Main extends MIDlet
{
    protected void startApp()
    {
        WapLyj lyj = new WapLyj();
        try {
            lyj.test();//调用方法
        } catch(MyError e) {
            e.toString();//捕获错误
        }
    }
    protected void pauseApp() { }
    protected void destroyApp(boolean arg0) { }
}
/*
*类一
*/
class WapLyj
{
    String url = "";
    public void test() throws MyError
    {
        if (this.url == "")
            throw new MyError("变量url未初始化值为“www.waplyj.in”");//抛出错误
        else
        {
            try {
                new Main().platformRequest(this.url);
                } catch(ConnectionNotFoundException cnfe) { }
        }
    }
}
/*
*类二
*/
class MyError extends Exception
{
    String msg = "";
    public MyError(String msg)
    {
        this.msg = msg;
    }
    public String toString()
    {
        return this.msg;
    }
}