Java.util.IdentityHashMap.hashCode()

Java中的java.util.IdentityHashMap.hashCode()方法用于获取特定此IdentityHashMap的哈希码值。映射包含许多用于存储键值对的存储盒。每个存储盒都具有唯一标识,当键值对插入存储盒时,密钥的哈希码与存储桶的标识符匹配,如果匹配,则成功存储该对。这是哈希码的工作原理。

句法:

Identity_HashMap.hashCode()

参数:该方法不接受任何参数。

返回值:该方法返回映射的哈希码值。

下面的程序用于说明java.util.IdentityHashMap.hashCode()的工作方法

程序1:将字符串值映射到整数键。

// Java code to illustrate the hashCode() method
import java.util.*;

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

        // Creating an empty IdentityHashMap
        IdentityHashMap<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);

        // Getting the hashcode value for the map
        System.out.println("The hashcode value of the map: "
                                + identity_hash.hashCode());
    }
}

输出:

Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The hashcode value of the map: 2043437408

程序2:将 整数值映射到字符串键。

// Java code to illustrate the hashCode() 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);

        // Getting the hashcode value for the map
        System.out.println("The hashcode value of the map: "
                                + identity_hash.hashCode());
    }
}

输出:

Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The hashcode value of the map: 751311572

 
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