public static boolean isEquals( String s1, String s2)
	{
		return s1 == null ? s2 == null : s1.equals(s2);
	}
public static boolean isEquals ( String s1 , String s2 ) { return s1 == null ? s2 == null : s1 . equals ( s2 ) ; }
<p>isEquals.</p>

@param s1 a {@link java.lang.String} object.
@param s2 a {@link java.lang.String} object.
@return a boolean.