Java中, IdentityHashMap values() 的方法

作者: Arvin Chen 分类: Java 来源: Break易站(www.breakyizhan.com)

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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