public static String getDefaultEncodingName() 
{
        synchronized (lock) {
            if (defaultEncoding == null) {
                java.security.PrivilegedAction pa =
                    new sun.security.action.GetPropertyAction("file.encoding");
                defaultEncoding = (String)java.security.AccessController.doPrivileged(pa);
            }
        }
        return defaultEncoding;
}

 public static boolean isCached(int type,
    String encoding) 
{
        synchronized (lock) {
            SoftReference[] srs = classCache[type];
            for (int i = 0; i <  CACHE_SIZE; i++) {
                SoftReference sr = srs[i];
                if (sr == null)
                    continue;
                Object[] oa = (Object[])sr.get();
                if (oa == null) {
                    srs[i] = null;
                    continue;
                }
                if (oa[1].equals(encoding))
                    return true;
            }
            return false;
        }
}

 static Object newConverter(int type,
    String enc) throws UnsupportedEncodingException 
{
        Class c;
        synchronized (lock) {
            c = cache(type, enc);
            if (c == null) {
                c = getConverterClass(type, enc);
                if (!c.getName().equals("sun.io.CharToByteUTF8"))
                    cache(type, enc, c);
            }
        }
        return newConverter(enc, c);
}

Create a converter object that implements the given type of converter for the given encoding, or throw an UnsupportedEncodingException if no appropriate converter class can be found and instantiated

 static Object newDefaultConverter(int type) 
{
        Class c;
        synchronized (lock) {
            c = getDefaultConverterClass(type);
        }
        try {
            return newConverter("", c);
        } catch (UnsupportedEncodingException x) {
            throw new InternalError("Cannot instantiate default converter"
                                    + " class " + c.getName());
        }
}

Create a converter object that implements the given type of converter for the default encoding, falling back to ISO 8859-1 if the default encoding cannot be determined.

 public static  void resetDefaultEncodingName() 
{
        // This method should only be called during VM initialization.
        if (sun.misc.VM.isBooted())
            return;
        synchronized (lock) {
            defaultEncoding = "ISO-8859-1";
            Properties p = System.getProperties();
            p.setProperty("file.encoding", defaultEncoding);
            System.setProperties(p);
        }
}