Java IdentityHashMap equals()用法及代码示例

Java中的java.util.IdentityHashMap.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该映射的元素。

用法:

ihashmap1.equals(ihashmap2)

参数：该方法接受一个身份哈希映射类型的参数ihashmap2，表示要使用此哈希映射检查其相等性的映射。

返回值：如果两个对象映射都相等，则该方法返回true，否则返回false。

以下程序说明了java.util.IdentityHashMap.equals()方法的用法：
示例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

示例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

相关用法

注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 IdentityHashMap equals() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。