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What does the (~) mean in the attached diagram.

What does the (~) mean in the attached diagram.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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It will use a class called NameHelper (which you will write).  This class will provide methods to load the data files and to fetch name rankings by year.  The JavaFX class will be using NameHelper according to the following UML, so make sure your data helper has the methods defined below:   What does the (~) mean in the attached diagram. 

The diagram represents a class named `NameHelper` in a UML (Unified Modeling Language) format. It lists the attributes and methods provided by the class. Here is a detailed explanation: ### Attributes: 1. **`~girlsByYear: HashMap<String, Map<String, Integer>>`** - A package-private attribute, likely storing data about girls' names categorized by year. Each year (String) maps to another map which contains a string (presumably a name) and its count or rank (Integer). 2. **`~boysByYear: HashMap<String, Map<String, Integer>>`** - Another package-private attribute with a similar structure to `girlsByYear`, but for boys' names. ### Methods: 1. **`+isNamePresent(): boolean`** - A public method that likely checks if a certain name is present in the database and returns a boolean value (true or false). 2. **`+getYears(): Set<String>`** - A public method that probably returns a set of all the years available in the data. 3. **`+getRank(): int`** - A public method that might provide the rank of a name for a given year or across years. 4. **`+load(): void throws FileNotFoundException`** - A public method responsible for loading data, which might throw a `FileNotFoundException` if the file is not found during execution. The diagram visually indicates the class design, providing insights into its data structure and functionality.
Transcribed Image Text:The diagram represents a class named `NameHelper` in a UML (Unified Modeling Language) format. It lists the attributes and methods provided by the class. Here is a detailed explanation: ### Attributes: 1. **`~girlsByYear: HashMap<String, Map<String, Integer>>`** - A package-private attribute, likely storing data about girls' names categorized by year. Each year (String) maps to another map which contains a string (presumably a name) and its count or rank (Integer). 2. **`~boysByYear: HashMap<String, Map<String, Integer>>`** - Another package-private attribute with a similar structure to `girlsByYear`, but for boys' names. ### Methods: 1. **`+isNamePresent(): boolean`** - A public method that likely checks if a certain name is present in the database and returns a boolean value (true or false). 2. **`+getYears(): Set<String>`** - A public method that probably returns a set of all the years available in the data. 3. **`+getRank(): int`** - A public method that might provide the rank of a name for a given year or across years. 4. **`+load(): void throws FileNotFoundException`** - A public method responsible for loading data, which might throw a `FileNotFoundException` if the file is not found during execution. The diagram visually indicates the class design, providing insights into its data structure and functionality.
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