Java中EnumMap的values()方法: Java.util.EnumMap.values()

作者: Arvin Chen 分类: Java 发布时间: 2018-09-01 17:33

Java中的Java.util.EnumMap.values()方法用于从map的值中创建集合。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

Java.util.EnumMap.values()程序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]

Java.util.EnumMap.values()程序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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