https://docs.aws.amazon.com/ja_jp/amazondynamodb/latest/developerguide/Introduction.html CLIからのアクセス方法 https://docs.aws.amazon.com/ja_jp/amazondynamodb/latest/developerguide/Tools.CLI.html Javaから(低レベルAPI) https://docs.aws.amazon.com/ja_jp/amazondynamodb/latest/developerguide/GettingStarted.Java.html