Java中的Java.util.EnumMap.containsValue(value)方法用于确定映射的一个或多个键是否与给定值相关联。它将值作为参数,如果该值由EnumMap中的任何键映射,则返回True。

句法:

boolean containsValue(Object value)

参数:该方法接受一个参数,该值指的是要通过任何键检查其映射的值。

返回值:当一个或多个键映射到相同值时返回true。

下面的程序说明了Java.util.EnumMap.containsValue()方法

Java.util.EnumMap.containsValue(value)程序1:

// Java program to demonsrate containsValue() method
import java.util.*;

// An enum of gfg ranking is created
public enum rank_countries {
    India,
    United_States,
    China,
    Japan,
    Canada,
    Russia
};

class Enum_map {
    public static void main(String[] args)
    {

        EnumMap<rank_countries, Integer> mp = new
        EnumMap<rank_countries,Integer>(rank_countries.class);

        // values are associated in mp
        mp.put(rank_countries.India, 72);
        mp.put(rank_countries.United_States, 1083);
        mp.put(rank_countries.China, 4632);
        mp.put(rank_countries.Japan, 6797);
        mp.put(rank_countries.Canada, 1820);

        // check if map contains mapping at specified key
        boolean ans = mp.containsValue(72);

        // prints the result
        System.out.println("Map contains 72: " + ans);
    }
}

输出:

Map contains 72: true

Java.util.EnumMap.containsValue(value)程序2:

// Java program to demonsrate containsValue() method
import java.util.*;

// An enum of gfg ranking is created
public enum rank_countries {
    India,
    United_States,
    China,
    Japan,
    Canada,
    Russia
};

class Enum_map {
    public static void main(String[] args)
    {

        EnumMap<rank_countries, Integer> mp = new
        EnumMap<rank_countries,Integer>(rank_countries.class);

        // values are associated in mp
        mp.put(rank_countries.India, 72);
        mp.put(rank_countries.United_States, 1083);
        mp.put(rank_countries.China, 4632);
        mp.put(rank_countries.Japan, 6797);
        mp.put(rank_countries.Canada, 1820);

        // check if map contains mapping at specified key
        boolean ans = mp.containsValue(2000);

        // prints the result
        System.out.println("Map contains 2000: " + ans);
    }
}

输出:

Map contains 2000: false

 
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