関連ワード:  java check collection is not null or empty    java check is not null or empty    java check string is not null or empty    java check list is not null or empty    java check map is not null or empty    java check array is not null or empty    java check set is not null or empty    java check object is not null or empty    java check if collection is not null and not empty    java check if list is not null or empty  
結果 : java check collection is not null or empty