Java中的 EnumMap values() 方法

Java中的Java .util.EnumMap.values() 方法用于从地图的值中创建一个集合。它基本上返回 EnumMap 中值的集合视图。

句法：

EnumMap.values()

参数：该方法不带任何参数。

返回值：该方法返回映射值的集合视图。

下面的程序说明了Java.util.EnumMap.values()函数的工作原理：
方案一：

// Java program to demonstrate values()
import java.util.*;
  
// An enum of geeksforgeeks
public enum gfg {
    India_today,
    United_States_today
}
;
  
class Enum_demo {
    public static void main(String[] args)
    {
  
        EnumMap mp = new 
                        EnumMap(gfg.class);
  
        // Values are associated
        mp.put(gfg.India_today, 69);
        mp.put(gfg.United_States_today, 1073);
  
        // Prints the map
        System.out.println("The EnumMap: " + mp);
  
        // Retrieving the collection view of the map
        Collection view = mp.values();
  
        // Prints the result
        System.out.println("Collection view of map: " + view);
    }
}

输出：

The EnumMap: {India_today=69, United_States_today=1073}
Collection view of map: [69, 1073]

方案二：

// Java program to demonstrate the working of values()
import java.util.*;
  
// An enum of geeksforgeeks
public enum gfg {
    India_today,
    United_States_today,
    Canada_today
}
;
  
class Enum_demo {
    public static void main(String[] args)
    {
        EnumMap mp = new 
                      EnumMap(gfg.class);
  
        // Values are associated
        mp.put(gfg.India_today, 69);
        mp.put(gfg.United_States_today, 1073);
        mp.put(gfg.Canada_today, 1837);
  
        // Prints the map
        System.out.println("The EnumMap: " + mp);
  
        // Retrieving the collection view of the map
        Collection view = mp.values();
  
        // Prints the result
        System.out.println("Collection view of map: " + view);
    }
}

输出：

The EnumMap: {India_today=69, United_States_today=1073, Canada_today=1837}
Collection view of map: [69, 1073, 1837]