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提交 8c3146d5 编写于 作者: A Annie_wang

update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>
上级 9ce9b6d8
master E0523 OpenHarmony-3.2-Beta2 OpenHarmony-3.2-Beta3 OpenHarmony-3.2-Beta4 OpenHarmony-3.2-Beta5 OpenHarmony-3.2-Release OpenHarmony-4.0-Beta1 OpenHarmony-4.0-Beta2 OpenHarmony_filemanager_develop_20220614 TR4270 bak_OpenHarmony-4.0-Beta1_20230529 docs-modify feature_IDL_20220811 monthly_20220614 monthly_20220816 monthly_20221018 monthly_20230815 revert-merge-17651-master revert-merge-19334-OpenHarmony-4.0-Beta1 revert-merge-19586-master revert-merge-20613-master revert-merge-21757-OpenHarmony-4.0-Beta2 revert-merge-21765-OpenHarmony-4.0-Beta2 revert-merge-23766-master revert-merge-5580-master weekly_20220524 weekly_20220531 weekly_20220607 weekly_20220614 weekly_20220621 weekly_20220628 weekly_20220705 weekly_20220712 weekly_20220719 weekly_20220726 weekly_20220802 weekly_20220809 weekly_20220816 weekly_20220823 weekly_20220830 weekly_20220906 weekly_20220913 weekly_20220920 weekly_20220927 weekly_20221004 weekly_20221011 weekly_20221018 weekly_20221025 weekly_20221101 weekly_20221108 weekly_20221115 weekly_20221122 weekly_20221129 weekly_20221206 weekly_20221213 weekly_20221220 weekly_20221227 weekly_20230103 weekly_20230110 weekly_20230117 weekly_20230124 weekly_20230131 weekly_20230207 weekly_20230214 weekly_20230221 weekly_20230228 weekly_20230307 weekly_20230314 weekly_20230321 weekly_20230328 weekly_20230404 weekly_20230411 weekly_20230418 weekly_20230425 weekly_20230502 weekly_20230509 weekly_20230516 weekly_20230523 weekly_20230530 weekly_20230606 weekly_20230613 weekly_20230619 weekly_20230626 weekly_20230627 weekly_20230704 weekly_20230712 weekly_20230725 weekly_20230801 weekly_20230808 weekly_20230815 weekly_20230822 weekly_20230829 weekly_20230905 OpenHarmony-v4.0-Beta2 OpenHarmony-v4.0-Beta1 OpenHarmony-v3.2.3-Release OpenHarmony-v3.2.2-Release OpenHarmony-v3.2.1-Release OpenHarmony-v3.2-Release OpenHarmony-v3.2-Beta5 OpenHarmony-v3.2-Beta4 OpenHarmony-v3.2-Beta3 OpenHarmony-v3.2-Beta2 OpenHarmony-v3.2-Beta1
......@@ -4,7 +4,7 @@ Preferences are used for access and persistence operations on the data in the ke
## Basic Concepts
- **Key-Value data structure**
- **Key-value data structure**
A type of data structure. The key is the unique identifier for a piece of data, and the value is the specific data being identified.
......@@ -14,8 +14,9 @@ Preferences are used for access and persistence operations on the data in the ke
## Working Principles
1. When an application loads data from a **Preferences** file to a **Preferences** instance, the system stores the instance in the memory through a static container. Each file of an application or process has only one **Preferences** instance in the memory, till the application removes the instance from the memory or deletes the **Preferences** file.
2. When obtaining a **Preferences** instance, the application can read data from or write data to the instance. The data in the instance can be flushed to its **Preferences** file by calling the **flush()** method.
When an application loads data from a **Preferences** file to a **Preferences** instance, the system stores the instance in the memory through a static container. Each file of an application or process has only one **Preferences** instance in the memory, till the application removes the instance from the memory or deletes the **Preferences** file.
When obtaining a **Preferences** instance, the application can read data from or write data to the instance. The data in the instance can be flushed to its **Preferences** file by calling the **flush()** method.
**Figure 1** How **Preferences** work
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