public void error(String format, Object arg) {
        formatAndLog(Log.ERROR, format, arg);
    }
public void error(String format, Object arg) {
        formatAndLog(Log.ERROR, format, arg);
    }
public void error ( String format , Object arg ) { formatAndLog ( Log . ERROR , format , arg ) ; }
Log a message at the ERROR level according to the specified format and
argument.
<p>
<p>
This form avoids superfluous object creation when the logger is disabled
for the ERROR level.
</p>

@param format the format string
@param arg    the argument
Log a message at the ERROR level according to the specified format and argument . <p > <p > This form avoids superfluous object creation when the logger is disabled for the ERROR level . < / p >