Collections.emptyList() instead of null check?

Question

If I have a rarely used collection in some class which may be instantiated many times, I may sometimes resort to the following \"idiom\" in order to save unnecessary object crea

Answer 1

You can create a utility class with static methods, like:

public class ListUtil {

/**
 * Checks if {@link List} is null or empty.
 *
 * @param  the generic type
 * @param list the list
 * @return true, if is null or empty
 */
public static  boolean isNullOrEmpty(List list) {
    return list == null || list.size() == 0;
}

/**
 * Checks if {@link List} is not null and empty.
 *
 * @param  the generic type
 * @param list the list
 * @return true, if is not null and empty
 */
public static  boolean isNotNullAndEmpty(List list) {
    return list != null && list.size() != 0;
}

}