JavaFX学习：MVC模式中的PropertyValueFactory

╰+哭是因爲堅強的太久メ 2023-10-13 13:57 12阅读 0赞

PropertyValueFactory类是`“TableColumn cell value factory”,绑定创建列表中的项。示例如下：`

TableColumn<Person,String> firstNameCol = new TableColumn<Person,String>("First Name");
     firstNameCol.setCellValueFactory(new PropertyValueFactory<Person,String>("firstName"));

在以上中，Person类是TableView视图绑定的列表的项（items），String是TableColumn中项数据的类型。Person类必须是public，“First Name”是在TableView中显示的表头内容。PropertyValueFactory类的构造方法传入参数“firstName”创建实例，在列表项Person类中寻找与对应的**无参属性方法firstNameProperty（firstNameProperty方法必须与传入的参数firstName对应，应该是通过反射方式进行名称对应。firstNameProperty方法可以对应任何名称的属性字段，例如firstNameABC属性字段都可以）**返回ObservableValue<String>。

如果无参属性方法firstNameProperty存在，则该方法会被触发并返回一个Property<String>**（Property是ObservableValue的子接口）**类型的实例。返回的实例作为数据项用来填充“Table Cell”。同时，TableView给返回的Property<String>实例注册一个观察者（observer），这样对数据项的任何改变都因触发observer立即通知TableView，项内容立即更新。

如果Person类中没有与“firstName”对应的无参firstNameProperty方法，PropertyValueFactory类则会扫描Person类中是否有返回值是**String类型**的无参方法getFirstName或无参方法isFirstName。如果有上述两个方法，则方法会被调用，返回被ReadOnlyObjectWrapper包装的值，值填充“Table Cell”。这种情况下，TableCell无法给包装的属性注册观察者观察数据变化状态。这种情况与调用firstNameProperty方法不同。

**注：《Learn JavaFX 8 Building User Experience and Interfaces with Java8》书中第13章例子，对于ageCategory数据显示的是Person.AgeCategory（枚举类型）数据，但是在处理过程中感觉是使用String类型数据处理。在后面Person的例子中，新增**public SimpleStringProperty ageCategoryProperty()方法、

public ReadOnlyStringWrapper ageCategoryProperty()方法符合PropertyValueFactory类的文档描述使用。

For reference (and as noted in the TableColumn `TableColumn.cellValueFactoryProperty()` cell value factory\} documentation), the long form of the code above would be the following:

以下代码作为参考：

TableColumn<Person,String> firstNameCol = new TableColumn<Person,String>("First Name");
    
    firstNameCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {
         public ObservableValue<String> call(CellDataFeatures<Person, String> p) {
             // p.getValue() returns the Person instance for a particular TableView row
             return p.getValue().firstNameProperty();
         }
      });
     }

以下是一个使用PropertyValueFactory的例子：

继承PropertyValueFactory的类，实现方法call：

package learn.javafx8.ch13.tableview04;
    
    import java.time.LocalDate;
    import static java.time.temporal.ChronoUnit.YEARS;
    
    import javafx.beans.property.ReadOnlyStringWrapper;
    import javafx.beans.value.ObservableValue;
    import javafx.scene.control.TableColumn.CellDataFeatures;
    import javafx.scene.control.cell.PropertyValueFactory;
    
    import learn.javafx8.ch11.Person;
    
    /**
     * @copyright 2023-2022
     * @package   cn.javafx.ch13.tableview04
     * @file      ModelDataByPropertyValueFactory.java
     * @date      2023-07-08 22:59
     * @author    qiao wei
     * @version   1.0
     * @brief     继承PropertyValueFactory类，重写call方法，间接实现Callback接口。
     * @history
     */
    public class ModelDataByPropertyValueFactory extends PropertyValueFactory<Person, String> {
    
        public ModelDataByPropertyValueFactory(Person person, String content) {
            // Call PropertyValueFactory constructor.
            super(content);
        }
    
        @Override
        public ObservableValue<String> call(CellDataFeatures<Person, String> cellDataFeatures) {
            LocalDate localDate = cellDataFeatures.getValue().birthDate();
            String ageInYear = "Unknown";
    
            if (null != localDate) {
                long years = YEARS.between(localDate, LocalDate.now());
                if (years == 0) {
                    ageInYear = "< 1 year";
                } else if (years == 1) {
                    ageInYear = years + " year";
                } else {
                    ageInYear = years + " years";
                }
            }
    
            return new ReadOnlyStringWrapper(ageInYear);
        }
    }

调用ModelDataByPropertyValueFactory类替代PropertyValueFactory类。只看start01方法的调用实现。在start0\*方法掉作用中，可以修改Person类提供的ageCategory方法测试提供给PropertyValueFactory构造方的参数。

package learn.javafx8.ch13.tableview04;
    
    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.TableColumn;
    import javafx.scene.control.TableView;
    import javafx.scene.control.cell.PropertyValueFactory;
    import javafx.scene.layout.HBox;
    import javafx.stage.Stage;
    
    import learn.javafx8.ch11.AgeCategory;
    import learn.javafx8.ch11.Person;
    import learn.javafx8.ch13.PersonTableUtil;
    
    /**
     * @copyright 2023-2022
     * @package   cn.javafx.ch13.tableview04
     * @file      TableViewDataTest.java
     * @date      2023-07-15 01:56
     * @author    qiao wei
     * @version   1.0
     * @brief     
     * @history
     */
    public class TableViewDataTest extends Application {
    	
    	public static void main(String[] args) {
    		Application.launch(TableViewDataTest.class, args);
    	}
    
    	@Override
    //	@SuppressWarnings("unchecked")
    	public void start(Stage primaryStage) {
    		try {
    			start02(primaryStage);
    		} catch (Exception exception) {
    			exception.printStackTrace();
    		}
    	}
    	
    	/**
    	 * @class   TableViewDataTest
    	 * @date    2023-07-15 09:01
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   ModelDataByPropertyValueFactory类继承PropertyValueFactory类，间接继承Callback回调接口，重写call方法。
    	 * @param   primaryStage Main window.
    	 * @return  
    	 * @throws
    	 */
    	private void start01(Stage primaryStage) throws Exception {
    		// Create a TableView and bind model.
    		TableView<Person> table = new TableView<>(PersonTableUtil.getPersonList());
    
    		/**
    		 * Create an "Age" computed column.
    		 * TableColumn<S, T>(text)
    		 *  S: The type of the TableView generic type.
    		 *  T: The type of the content in all cells in this TableColumn.
    		 *  "Age": The string to show when the TableColumn is placed within the TableView.
    		 */
    		TableColumn<Person, String> ageColumn = new TableColumn<>("Age");
    		ageColumn.setCellValueFactory(new ModelDataByPropertyValueFactory(new Person(), new String()));
    		
    		// Create an "Age Category" column.
    		TableColumn<Person, AgeCategory> ageCategoryColumn = new TableColumn<>("Age Category");
    //		ageCategoryColumn.setCellValueFactory(new PropertyValueFactory<>("ageCategory"));
    		ageCategoryColumn.setCellValueFactory(new ModelDataByAgeCategory());
    
    		// Add columns to the TableView.
    		table.getColumns().addAll(PersonTableUtil.getIdColumn()
    			, PersonTableUtil.getFirstNameColumn()
    			, PersonTableUtil.getLastNameColumn()
    			, PersonTableUtil.getBirthDateColumn()
    			, ageColumn
    			, ageCategoryColumn);
    
    		HBox root = new HBox(table);
    		root.setStyle("-fx-padding: 10;"
    			+ "-fx-border-style: solid inside;"
    			+ "-fx-border-width: 2;"
    			+ "-fx-border-insets: 5;"
    			+ "-fx-border-radius: 5;"
    			+ "-fx-border-color: blue;");
    
    		Scene scene = new Scene(root);
    		primaryStage.setScene(scene);
    		primaryStage.setTitle("Populating TableViews");
    		primaryStage.show();
    	}
    	
    	/**
    	 * @class   TableViewDataTest
    	 * @date    2023-07-15 09:12
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   ModelDataByCallback类实现Callback接口。
    	 * @param   primaryStage Main window.
    	 * @return  
    	 * @throws
    	 */
    	private void start02(Stage primaryStage) throws Exception {
    		// Create a TableView and bind model.
    		TableView<Person> table = new TableView<>(PersonTableUtil.getPersonList());
    
    		/**
    		 * Create an "Age" computed column.
    		 * TableColumn<S, T>(text)
    		 *  S: The type of the TableView generic type.
    		 *  T: The type of the content in all cells in this TableColumn.
    		 *  "Age": The string to show when the TableColumn is placed within the TableView.
    		 */
    		TableColumn<Person, String> ageColumn = new TableColumn<>("Age");
    		ageColumn.setCellValueFactory(new ModelDataByCallback());
    		
    		// AgeCategory和String类型对比。
    //		TableColumn<Person, AgeCategory> ageCategoryColumn = new TableColumn<>("Age Category");
    //		ageCategoryColumn.setCellValueFactory(new PropertyValueFactory<>("ageCategory"));
    		TableColumn<Person, String> ageCategoryColumn = new TableColumn<>("Age Category");
    		ageCategoryColumn.setCellValueFactory(new PropertyValueFactory<>("ageCategory"));
    		
    		// Add columns to the TableView.
    		table.getColumns().addAll(PersonTableUtil.getIdColumn()
    			, PersonTableUtil.getFirstNameColumn()
    			, PersonTableUtil.getLastNameColumn()
    			, PersonTableUtil.getBirthDateColumn()
    			, ageColumn
    			, ageCategoryColumn);
    		
    		HBox root = new HBox(table);
    		root.setStyle("-fx-padding: 10;"
    			+ "-fx-border-style: solid inside;"
    			+ "-fx-border-width: 2;"
    			+ "-fx-border-insets: 5;"
    			+ "-fx-border-radius: 5;"
    			+ "-fx-border-color: blue;");
    		
    		Scene scene = new Scene(root);
    		primaryStage.setScene(scene);
    		primaryStage.setTitle("Populating TableViews");
    		primaryStage.show();
    	}
    	
    	/**
    	 * @class   TableViewDataTest
    	 * @date    2023-07-15 09:21
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   ModelDataByAgeCategory类实现Callback接口。call方法的返回值为ObservableValue<AgeCategory>，在call方法中将
    	 *           AgeCategory枚举类型包装成ReadOnlyObjectWrapper类型返回。
    	 * @param   primaryStage Main window.
    	 * @return  
    	 * @throws
    	 */
    	private void start03(Stage primaryStage) throws Exception {
    		// Create a TableView and bind model.
    		TableView<Person> table = new TableView<>(PersonTableUtil.getPersonList());
    
    		/**
    		 * Create an "Age" computed column.
    		 * TableColumn<S, T>(text)
    		 *  S: The type of the TableView generic type.
    		 *  T: The type of the content in all cells in this TableColumn.
    		 *  "Age": The string to show when the TableColumn is placed within the TableView.
    		 */
    		TableColumn<Person, String> ageColumn = new TableColumn<>("Age");
    		ageColumn.setCellValueFactory(new ModelDataByCallback());
    		
    		/**
    		 * Create an "Age Category" column.
    		 * 创建Age列，其中项类型是Person类，列类型是Person.AgeCategory。将“ageCategory”作为属性名称传给PropertyValueFactory
    		 *  类的构造方法。首先，PropertyValueFactory类在Person类中检索名为“ageCategory”的属性，但是Person类中没有该属性。
    		 *  PropertyValueFactory类按照POJO原则（简答Java原则）处理该属性。PropertyValueFactory类在Person类中寻找
    		 *  getAgeCategory方法和setAgeCategory方法，如果只检索到getAgeCategory方法，则该列设置为只读。
    		 */
    		TableColumn<Person, AgeCategory> ageCategoryColumn = new TableColumn<>("Age Category");
    //		ageCategoryColumn.setCellValueFactory(new PropertyValueFactory<>("ageCategory"));
    		ageCategoryColumn.setCellValueFactory(new ModelDataByAgeCategory());
    		
    		// Add columns to the TableView.
    		table.getColumns().addAll(PersonTableUtil.getIdColumn()
    			, PersonTableUtil.getFirstNameColumn()
    			, PersonTableUtil.getLastNameColumn()
    			, PersonTableUtil.getBirthDateColumn()
    			, ageColumn
    			, ageCategoryColumn);
    		
    		HBox root = new HBox(table);
    		root.setStyle("-fx-padding: 10;"
    			+ "-fx-border-style: solid inside;"
    			+ "-fx-border-width: 2;"
    			+ "-fx-border-insets: 5;"
    			+ "-fx-border-radius: 5;"
    			+ "-fx-border-color: blue;");
    		
    		Scene scene = new Scene(root);
    		primaryStage.setScene(scene);
    		primaryStage.setTitle("Populating TableViews");
    		primaryStage.show();
    	}
    }

作为模型数据的Person：

package learn.javafx8.ch11;
    
    import java.time.LocalDate;
    import java.time.temporal.ChronoUnit;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.atomic.AtomicInteger;
    
    import javafx.beans.property.ObjectProperty;
    import javafx.beans.property.ReadOnlyIntegerProperty;
    import javafx.beans.property.ReadOnlyIntegerWrapper;
    import javafx.beans.property.ReadOnlyStringWrapper;
    import javafx.beans.property.SimpleObjectProperty;
    import javafx.beans.property.SimpleStringProperty;
    import javafx.beans.property.StringProperty;
    
    /**
     * @copyright 2023-2022
     * @package   cn.javafx.ch11
     * @file      Person.java
     * @date      2023-07-01 21:31
     * @author    qiao wei
     * @version   1.0
     * @brief     模型类。保存数据，字段使用属性，可以通过注册监听器监听数据更新情况，自动更新属性。
     * @history
     */
    public class Person {
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-01 21:31
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   Default constructor.
    	 * @param   
    	 * @return  
    	 * @throws
    	 */
    	public Person() {
    		this("None", "None", null);
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-01 21:32
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   Constructor.
    	 * @param   firstName 名。
    	 * @param   lastName  姓。
    	 * @param   birthDate 出生日期。
    	 * @return
    	 * @throws
    	 */
    	public Person(String firstName, String lastName, LocalDate birthDate) {
    		this.firstName.set(firstName);
    		this.lastName.set(lastName);
    		this.birthDate.set(birthDate);
    	}
    	
    	public final int personId() {
    		return personId.get();
    	}
    	
    	public final ReadOnlyIntegerProperty personIdProperty() {
    		return personId.getReadOnlyProperty();
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-01 21:37
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   Retrieve first name property.
    	 * @param
    	 * @return  Person first name.
    	 * @throws
    	 */
    	public final String firstName() {
    		return firstName.get();
    	}
    
    	public final void setFirstName(String firstName) {
    		this.firstName.set(firstName);
    	}
    
    	public final StringProperty firstNameProperty() {
    		return firstName;
    	}
    
    	public final String lastName() {
    		return lastName.get();
    	}
    
    	public final void setLastName(String lastName) {
    		this.lastName.set(lastName);
    	}
    
    	public final StringProperty lastNameProperty() {
    		return lastName;
    	}
    
    	/** birthDate Property */
    	public final LocalDate birthDate() {
    		return birthDate.get();
    	}
    	
    	public final void setBirthDate(LocalDate birthDate) {
    		this.birthDate.set(birthDate);
    	}
    	
    	public final ObjectProperty<LocalDate> birthDateProperty() {
    		return birthDate;
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-02 10:30
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   Domain specific business rules.
    	 * @param   localDate 当地时区日期
    	 * @return
    	 * @throws
    	 */
    	public boolean isValidBirthDate(LocalDate localDate) {
    		return isValidBirthDate(localDate, new ArrayList<>());
    	}
    	
    	/**
    	 * @class   Person
    	 * @date    2023-07-08 19:21
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   验证输入的出生日期是否有效。出生日期无效时，将错误日志记录到errorList中。
    	 * @param   date 出生日期。
    	 * @param   errorList 错误日志。   
    	 * @return  出生日期有效返回true，反之返回false。
    	 * @throws
    	 */
    	public boolean isValidBirthDate(LocalDate date, List<String> errorList) {
    		if (null == date) {
    			return true;
    		}
    
    		// Birthdate cannot be in the future
    		if (date.isAfter(LocalDate.now())) {
    			errorList.add(LocalDate.now().toString() + " : Birth date must not be in future.");
    
    			return false;
    		}
    
    		return true;
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-02 11:51
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   重写方法，验证个人信息是否正确。Domain specific business rules。
    	 * @param   errorList 错误信息列表。
    	 * @return
    	 * @throws
    	 */
    	public boolean isValidPerson(List<String> errorList) {
    		return isValidPerson(this, errorList);
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-02 11:53
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   重写方法，验证个人信息是否正确，对个人的姓、名、生日进行有效性验证。Domain specific business
    	 *           rules。
    	 * @param   person 需要验证的个人信息。
    	 * @param   errorList 错误信息列表。记录错误信息。 
    	 * @return  true 个人信息有效；false 个人信息无效。
    	 * @throws
    	 */
    	public boolean isValidPerson(Person person, List<String> errorList) {
    		boolean isValidPerson = true;
    		String firstName = person.firstName();
    
    		// 将以下3个判断条件都走一遍，将所有异常信息统计到errorList中
    		if (firstName == null || firstName.trim().length() == 0) {
    			errorList.add("First name must contain minimum one character.");
    			isValidPerson = false;
    		}
    
    		String lastName = person.lastName();
    		if (null == lastName || 0 == lastName.trim().length()) {
    			errorList.add("Last name must contain minimum one character.");
    			isValidPerson = false;
    		}
    
    		if ( !isValidBirthDate(this.birthDate.get(), errorList)) {
    			isValidPerson = false;
    		}
    
    		return isValidPerson;
    	}
    	
    	/**
    	 * @class   Person
    	 * @date    2023-07-02 12:15
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   根据年龄，返回不同的年龄层。
    	 * @param
    	 * @return  年龄层，枚举类型。根据不同年龄返回不同年龄层。
    	 * @throws
    	 */
    	public AgeCategory getAgeCategory() {
    		if (null == birthDate.get()) {
    			return AgeCategory.UNKNOWN;
    		}
    
    		// 计算年龄。
    		long years = ChronoUnit.YEARS.between(birthDate.get(), LocalDate.now());
    		if (0 <= years && 2 > years) {
    			return AgeCategory.BABY;
    		} else if (2 <= years && 13 > years) {
    			return AgeCategory.CHILD;
    		} else if (13 <= years && 19 >= years) {
    			return AgeCategory.TEEN;
    		} else if (19 < years && 50 >= years) {
    			return AgeCategory.ADULT;
    		} else if (50 < years) {
    			return AgeCategory.SENIOR;
    		} else {
    			return AgeCategory.UNKNOWN;
    		}
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-21 00:29
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   方法命名符合***Property格式，PropertyValueFactory类构造方法通过反射调用。返回值继承接口ObservableValue<String>
    	 * @param
    	 * @return
    	 * @throws
    	 */
    	public ReadOnlyStringWrapper ageCategoryProperty() {
    		if (null == birthDate.get()) {
    			return new ReadOnlyStringWrapper(AgeCategory.UNKNOWN.toString());
    		}
    
    		// 计算年龄。
    		long years = ChronoUnit.YEARS.between(birthDate.get(), LocalDate.now());
    		if (0 <= years && 2 > years) {
    			return new ReadOnlyStringWrapper(AgeCategory.BABY.toString());
    		} else if (2 <= years && 13 > years) {
    			return new ReadOnlyStringWrapper(AgeCategory.CHILD.toString());
    		} else if (13 <= years && 19 >= years) {
    			return new ReadOnlyStringWrapper(AgeCategory.TEEN.toString());
    		} else if (19 < years && 50 >= years) {
    			return new ReadOnlyStringWrapper(AgeCategory.ADULT.toString());
    		} else if (50 < years) {
    			return new ReadOnlyStringWrapper(AgeCategory.SENIOR.toString());
    		} else {
    			return new ReadOnlyStringWrapper(AgeCategory.UNKNOWN.toString());
    		}
    	}
    
    	/**
    	 * @class   Person
    	 * @date    2023-07-21 00:29
    	 * @author  qiao wei
    	 * @version 1.0
    	 * @brief   方法命名符合***Property格式，PropertyValueFactory类构造方法通过反射调用。返回值继承接口ObservableValue<String>
    	 * @param
    	 * @return
    	 * @throws
    	 */
    //	public SimpleStringProperty ageCategoryProperty() {
    //		if (null == birthDate.get()) {
    //			return new SimpleStringProperty(AgeCategory.UNKNOWN.toString());
    //		}
    //
    //		// 计算年龄。
    //		long years = ChronoUnit.YEARS.between(birthDate.get(), LocalDate.now());
    //		if (0 <= years && 2 > years) {
    //			return new SimpleStringProperty(AgeCategory.BABY.toString());
    //		} else if (2 <= years && 13 > years) {
    //			return new SimpleStringProperty(AgeCategory.CHILD.toString());
    //		} else if (13 <= years && 19 >= years) {
    //			return new SimpleStringProperty(AgeCategory.TEEN.toString());
    //		} else if (19 < years && 50 >= years) {
    //			return new SimpleStringProperty(AgeCategory.ADULT.toString());
    //		} else if (50 < years) {
    //			return new SimpleStringProperty(AgeCategory.SENIOR.toString());
    //		} else {
    //			return new SimpleStringProperty(AgeCategory.UNKNOWN.toString());
    //		}
    //	}
    
    	public boolean save(List<String> errorList) {
    		boolean isSaved = false;
    
    		if (isValidPerson(errorList)) {
    			System.out.println("Saved " + this.toString());
    			isSaved = true;
    		}
    
    		return isSaved;
    	}
    
    	@Override
    	public String toString() {
    		StringBuilder stringBuilder = new StringBuilder("[personId=");
    		stringBuilder.append(personId.get()).
    			append(", firstName = ").append(firstName.get()).
    			append(", lastName = ").append(lastName.get()).
    			append(", birthDate = ").append(birthDate.get()).append("]");
    
    		return stringBuilder.toString();
    	}
    	
    	/**
    	 * @date   2023-07-01 21:33
    	 * @author qiao wei
    	 * @brief  Person id。只读类型。
    	 */
    	private final ReadOnlyIntegerWrapper personId =
    		new ReadOnlyIntegerWrapper(this, "personId", personSequence.incrementAndGet());
    	
    	private final StringProperty firstName =
    		new SimpleStringProperty(this, "firstName", null);
    	
    	private final StringProperty lastName =
    		new SimpleStringProperty(this, "lastName", null);
    	
    	/**
    	 * @date   2023-07-01 21:33
    	 * @author qiao wei
    	 * @brief  出生日期。
    	 */
    	private final ObjectProperty<LocalDate> birthDate =
    		new SimpleObjectProperty<>(this, "birthDate", null);
    	
    	/**
    	 * @date   2023-07-01 21:34
    	 * @author qiao wei
    	 * @brief  Class field. Keeps track of last generated person id.
    	 */
    	private static AtomicInteger personSequence = new AtomicInteger(0);
    }

AgeCategory从Person的内部数据调整。

AgeCategory：

package cn.learnjavafx.ch11;
    
    /**
     * @copyright 2023-2022
     * @package   cn.learnjavafx.ch11
     * @file      AgeCategory.java
     * @date      2023-07-07 16:21
     * @author    qiao wei
     * @version   1.0
     * @brief     年龄段。枚举类型，划分不同年龄段人员。
     * @history
     */
    public enum AgeCategory {
    	
    	BABY,
    	
    	CHILD,
    	
    	TEEN,
    	
    	ADULT,
    	
    	SENIOR,
    	
    	UNKNOWN
    }

运行结果：

![5394ee864ab04822adfb5ebc80907790.png][]

[5394ee864ab04822adfb5ebc80907790.png]: https://img-blog.csdnimg.cn/5394ee864ab04822adfb5ebc80907790.png