Compute the class attribute for a html tag

HTMLUtil.java

class HTMLUtil {

	// ... other  code 

	public static String styleClass(String ... styleClasses) {
		StringBuffer result = new StringBuffer();
		result.append("class=\"");

		for(String styleClass: styleClasses)
			if(styleClass != null)
				result.append(styleClass).append(" ");
		
		result.append("\"");
		return result.toString();
	}
	
	// ... other code
}