Java EnumMap values()用法及代码示例

Java中的Java.util.EnumMap.values()方法用于从Map值中创建一个集合。它本质上返回EnumMap中的值的Collection视图。

用法:

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收集视图。

以下程序说明了Java.util.EnumMap.values()函数的工作：
示例1:

// 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<gfg, Integer> mp = new 
                        EnumMap<gfg, Integer>(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<Integer> 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]

示例2:

// 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<gfg, Integer> mp = new 
                      EnumMap<gfg, Integer>(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<Integer> 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]

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注：本文由纯净天空筛选整理自akash1295大神的英文原创作品 EnumMap values() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。