関連ワード:  check list empty or null java    check list is empty or not java    check if list is empty or null java    check list not null or empty java    check if list is null or empty java 8    check if list is null or empty java 17    best way to check list is empty or null in java    javascript check if list is empty or null    check if list is not null or empty java    check if list string is null or empty java