public static Integer valueOf(int val)
public static Integer valueOf(String s, int radix)
  public static Integer valueOf(int val)  {    if (val < MIN_CACHE || val > MAX_CACHE)      return new Integer(val);    synchronized (intCache)      {	if (intCache[val - MIN_CACHE] == null)	  intCache[val - MIN_CACHE] = new Integer(val);	return intCache[val - MIN_CACHE];      }  }