関連ワード:  java check list empty or null    java check if list empty or null    java check list not empty or null    java 8 check list empty or null    how to check list empty or not in python    how to check list empty or not    how to check list is empty or null in c#    how to check list empty or not in java    how to check list is empty or not in c#    how to check list is empty or not in apex