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    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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