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<p>
      Using <code>new Integer(int)</code> is guaranteed to always result in a new object whereas
      <code>Integer.valueOf(int)</code> allows caching of values to be done by the compiler, class library, or JVM.
      Using of cached values avoids object allocation and the code will be faster.
      </p>
      <p>
      Values between -128 and 127 are guaranteed to have corresponding cached instances
      and using <code>valueOf</code> is approximately 3.5 times faster than using constructor.
      For values outside the constant range the performance of both styles is the same.
      </p>
      <p>
      Unless the class must be compatible with JVMs predating Java 1.5,
      use either autoboxing or the <code>valueOf()</code> method when creating instances of
      <code>Long</code>, <code>Integer</code>, <code>Short</code>, <code>Character</code>, and <code>Byte</code>.
      </p>