Java中的IdentityHashMap equals（）方法-yiteyi-C++库

爪哇。util。身份地图。Java中的equals（）方法用于检查两个映射之间的相等性。它验证作为参数传递的一个映射的元素是否等于此映射的元素。

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语法：

ihashmap1.equals(ihashmap2)

参数： 该方法接受一个参数 ihashmap2 标识哈希映射类型的，并指要与此哈希映射检查其相等性的映射。

返回值： 如果对象映射的等式均成立，则该方法返回true，否则返回false。

下面的程序说明了java的工作原理。util。身份地图。equals（）方法： 项目1：

                     // Java code to illustrate the equals() method                   
                     import                               java.util.*;                   
                             
                     public                               class                               Identity_Hash_Map_Demo {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         // Creating an empty IdentityHashMap                   
                                         IdentityHashMap<Integer, String> identity_hash1 =                   
                                         new                               IdentityHashMap<Integer, String>();                   
                                         IdentityHashMap<Integer, String> identity_hash2 =                   
                                         new                               IdentityHashMap<Integer, String>();                   
                             
                                         // Mapping string values to int keys                   
                                         identity_hash1.put(                               10                               ,                               "Geeks"                               );                   
                                         identity_hash1.put(                               15                               ,                               "4"                               );                   
                                         identity_hash1.put(                               20                               ,                               "Geeks"                               );                   
                                         identity_hash1.put(                               25                               ,                               "Welcomes"                               );                   
                                         identity_hash1.put(                               30                               ,                               "You"                               );                   
                             
                                         // Mapping string values to int keys                   
                                         identity_hash2.put(                               10                               ,                               "Geeks"                               );                   
                                         identity_hash2.put(                               15                               ,                               "4"                               );                   
                                         identity_hash2.put(                               20                               ,                               "Geeks"                               );                   
                                         identity_hash2.put(                               25                               ,                               "Welcomes"                               );                   
                                         identity_hash2.put(                               30                               ,                               "You"                               );                   
                             
                                         // Displaying the IdentityHashMap                   
                                         System.out.println(                               "First Map: "                   
                                         + identity_hash1);                   
                             
                                         // Displaying the final IdentityHashMap                   
                                         System.out.println(                               "Second Map: "                   
                                         + identity_hash2);                   
                             
                                         // Displaying the equality                   
                                         System.out.println(                               "Equality: "                               +                   
                                         identity_hash1.equals(identity_hash2));                   
                                         }                   
                     }                   

输出：

First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Equality: true

项目2：

                     // Java code to illustrate the equals() method                   
                     import                               java.util.*;                   
                             
                     public                               class                               Identity_Hash_Map_Demo {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         // Creating an empty IdentityHashMap                   
                                         IdentityHashMap<Integer, String> identity_hash1 =                   
                                         new                               IdentityHashMap<Integer, String>();                   
                                         IdentityHashMap<Integer, String> identity_hash2 =                   
                                         new                               IdentityHashMap<Integer, String>();                   
                             
                                         // Mapping string values to int keys                   
                                         identity_hash1.put(                               10                               ,                               "Geeks"                               );                   
                                         identity_hash1.put(                               15                               ,                               "4"                               );                   
                                         identity_hash1.put(                               20                               ,                               "Geeks"                               );                   
                                         identity_hash1.put(                               25                               ,                               "Welcomes"                               );                   
                                         identity_hash1.put(                               30                               ,                               "You"                               );                   
                             
                                         // Mapping string values to int keys                   
                                         identity_hash2.put(                               10                               ,                               "Geeks"                               );                   
                                         identity_hash2.put(                               15                               ,                               "4"                               );                   
                                         identity_hash2.put(                               20                               ,                               "Geek"                               );                   
                                         identity_hash2.put(                               25                               ,                               "Welcomes"                               );                   
                                         identity_hash2.put(                               30                               ,                               "You"                               );                   
                             
                                         // Displaying the IdentityHashMap                   
                                         System.out.println(                               "First Map: "                   
                                         + identity_hash1);                   
                             
                                         // Displaying the final IdentityHashMap                   
                                         System.out.println(                               "Second Map: "                   
                                         + identity_hash2);                   
                             
                                         // Displaying the equality                   
                                         System.out.println(                               "Equality: "                               +                   
                                         identity_hash1.equals(identity_hash2));                   
                                         }                   
                     }                   

输出：

First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geek, 25=Welcomes, 15=4}
Equality: false

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