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  • 2018-08-07  22:58:10        
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    Java中IdentityHashMap类的java.util.IdentityHashMap.values()方法用于从map的值中创建集合。它基本上返回Map中值的Collection。

    句法:

    Identity_Hash_Map.values()

    参数:该方法不接受任何参数。

    返回值:该方法用于返回包含map所有值的集合。

    下面的程序用于说明java.util.IdentityHashMap.values()的方法

    程序1:

    // Java code to illustrate the values() method
    import java.util.*;
    
    public class Identity_Hash_Map_Demo {
        public static void main(String[] args)
        {
    
            // Creating an empty IdentityHashMap
            Map<Integer, String> Identity_hash = new 
                         IdentityHashMap<Integer, String>();
    
            // Mapping string values to int keys
            Identity_hash.put(10, "Geeks");
            Identity_hash.put(15, "4");
            Identity_hash.put(20, "Geeks");
            Identity_hash.put(25, "Welcomes");
            Identity_hash.put(30, "You");
    
            // Displaying the IdentityHashMap
            System.out.println("Initial Mappings are: " + 
                                              Identity_hash);
    
            // Using values() to get the set view of values
            System.out.println("The collection is: " + 
                                       Identity_hash.values());
        }
    }
    

    输出:

    Initial Mappings are: {30=You, 15=4, 10=Geeks, 25=Welcomes, 20=Geeks}
    The collection is: [You, 4, Geeks, Welcomes, Geeks]

    程序2:

    // Java code to illustrate the values() method
    import java.util.*;
    
    public class Identity_Hash_Map_Demo {
        public static void main(String[] args)
        {
    
            // Creating an empty IdentityHashMap
            Map<String, Integer> Identity_hash = new 
                         IdentityHashMap<String, Integer>();
    
            // Mapping int values to string keys
            Identity_hash.put("Geeks", 10);
            Identity_hash.put("4", 15);
            Identity_hash.put("Geeks", 20);
            Identity_hash.put("Welcomes", 25);
            Identity_hash.put("You", 30);
    
            // Displaying the IdentityHashMap
            System.out.println("Initial Mappings are: " + 
                                              Identity_hash);
    
            // Using values() to get the set view of values
            System.out.println("The collection is: " + 
                                       Identity_hash.values());
        }
    }
    

    输出:

    Initial Mappings are: {Welcomes=25, 4=15, You=30, Geeks=20}
    The collection is: [25, 15, 30, 20]

     
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