java enummap

EnumMap类values()方法 (EnumMap Class values() method)

• values() method is available in java.util package.

  values()方法在java.util包中可用。

• values() method is used to get all the values in a Collection view of this enum map.

  values()方法用于获取此枚举映射的Collection视图中的所有值。

• values() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  values()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• values() method does not throw an exception at the time of collecting values in a Collection.

  在集合中收集值时， values()方法不会引发异常。

Syntax:

句法：

    public Collection values();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is Collection, it gets the Collection view of the values exists in this enum map.

此方法的返回类型为Collection ，它获取此枚举映射中存在的值的Collection视图。

Example:

例：

// Java program to demonstrate the example 
// of Collection values() method of EnumMap
import java.util.*;
public class ValuesOfEnumMap {
public enum Colors {
RED,
BLUE,
PINK,
YELLOW
};
public static void main(String[] args) {
// We are creating an EnumMap object
EnumMap < Colors, String > em =
new EnumMap < Colors, String > (Colors.class);
// By using put() method is to
// add the linked values in an
// EnumMap
em.put(Colors.RED, "1");
em.put(Colors.BLUE, "2");
em.put(Colors.PINK, "3");
em.put(Colors.YELLOW, "4");
// Display EnumMap
System.out.println("EnumMap: " + em);
// By using values() method isto
// represent the values element exists in an 
// EnumMap to be viewed in a Collection object
Collection val_ele = em.values();
// Display values collection view of EnumMap
System.out.println("em.values(): " + val_ele);
}
}

Output

输出量

EnumMap: {RED=1, BLUE=2, PINK=3, YELLOW=4}
em.values(): [1, 2, 3, 4]

翻译自: https://www.includehelp.com/java/enummap-values-method-with-example.aspx

java enummap