final public static FormattingTuple format(String messagePattern, Object arg) {
        return arrayFormat(messagePattern, new Object[] { arg });
    }
Performs single argument substitution for the 'messagePattern' passed as
parameter.
<p>
For example,

<pre>
MessageFormatter.format(&quot;Hi {}.&quot;, &quot;there&quot;);
</pre>

will return the string "Hi there.".
<p>

@param messagePattern
         The message pattern which will be parsed and formatted
@param arg
         The argument to be substituted in place of the formatting anchor
@return The formatted message
slf4j-api/src/main/java/org/slf4j/helpers/MessageFormatter.java