package com.scoredev.scores;import java.io.*;import java.security.*;import java.util.Hashtable;public class HighScore{    private String gameName;    private File highScoreFile;    public HighScore(String gameName)     {	this.gameName = gameName;	AccessController.doPrivileged(new PrivilegedAction() {	    public Object run() {		String path = 		    System.getProperty("user.home") +		    File.separator + 		    ".highscore";		highScoreFile = new File(path);		return null;	    }	});    }    public void setHighScore(final int score)	throws IOException    {	//check permission first	SecurityManager sm = System.getSecurityManager();	if (sm != null) {	    sm.checkPermission(new HighScorePermission(gameName));	}	// need a doPrivileged block to manipulate the file	try {	    AccessController.doPrivileged(new PrivilegedExceptionAction() {		public Object run() throws IOException {		    Hashtable scores = null;		    // try to open the existing file. Should have a locking		    // protocol (could use File.createNewFile).		    try {			FileInputStream fis = 			    new FileInputStream(highScoreFile);			ObjectInputStream ois = new ObjectInputStream(fis);			scores = (Hashtable) ois.readObject();		    } catch (Exception e) {			// ignore, try and create new file		    }		    // if scores is null, create a new hashtable		    if (scores == null)			scores = new Hashtable(13);		    // update the score and save out the new high score		    scores.put(gameName, new Integer(score));		    FileOutputStream fos = new FileOutputStream(highScoreFile);		    ObjectOutputStream oos = new ObjectOutputStream(fos);		    oos.writeObject(scores);		    oos.close();		    return null;		}	    });	} catch (PrivilegedActionException pae) {	    throw (IOException) pae.getException();	}    }    /**     * get the high score. return -1 if it hasn't been set.     *     */    public int getHighScore()	throws IOException, ClassNotFoundException    {	//check permission first	SecurityManager sm = System.getSecurityManager();	if (sm != null) {	    sm.checkPermission(new HighScorePermission(gameName));	}	Integer score = null;	// need a doPrivileged block to manipulate the file	try {	     score = (Integer) AccessController.doPrivileged(	                                new PrivilegedExceptionAction() {		public Object run() 		    throws IOException, ClassNotFoundException 		{		    Hashtable scores = null;		    // try to open the existing file. Should have a locking		    // protocol (could use File.createNewFile).		    FileInputStream fis = 			new FileInputStream(highScoreFile);		    ObjectInputStream ois = new ObjectInputStream(fis);		    scores = (Hashtable) ois.readObject();		    // get the high score out		    return scores.get(gameName);		}	    });	} catch (PrivilegedActionException pae) {	    Exception e = pae.getException();	    if (e instanceof IOException)		throw (IOException) e;	    else		throw (ClassNotFoundException) e;	}	if (score == null)		return -1;	else		return score.intValue();    }    public static void main(String args[])	throws Exception     {	HighScore hs = new HighScore(args[1]);	if (args[0].equals("set")) {	    hs.setHighScore(Integer.parseInt(args[2]));	} else {	    System.out.println("score = "+ hs.getHighScore());	}    }}