Java AbstractMap equals()用法及代码示例

Java 中的 AbstractMap.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:

AbstractMap1.equals(AbstractMap2)

参数：该方法接受一个抽象哈希映射类型的参数ihashmap2，表示要与该抽象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。

以下示例程序旨在说明 AbstractMap.equals() 方法的用法：

程序1:


// Java code to illustrate the equals() method
import java.util.*;
  
public class Abstract_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty AbstractMap
        AbstractMap<Integer, String>
            abstract_hash1 = new IdentityHashMap<Integer, String>();
  
        AbstractMap<Integer, String>
            abstract_hash2 = new IdentityHashMap<Integer, String>();
  
        // Mapping string values to int keys
        abstract_hash1.put(10, "Geeks");
        abstract_hash1.put(15, "4");
        abstract_hash1.put(20, "Geeks");
        abstract_hash1.put(25, "Welcomes");
        abstract_hash1.put(30, "You");
  
        // Mapping string values to int keys
        abstract_hash2.put(10, "Geeks");
        abstract_hash2.put(15, "4");
        abstract_hash2.put(20, "Geeks");
        abstract_hash2.put(25, "Welcomes");
        abstract_hash2.put(30, "You");
  
        // Displaying the AsbstractMap
        System.out.println("First Map:"
                           + abstract_hash1);
  
        // Displaying the final AbstractMap
        System.out.println("Second Map:"
                           + abstract_hash2);
  
        // Displaying the equality
        System.out.println("Equality:"
                           + abstract_hash1.equals(abstract_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

程序2:


// Java code to illustrate the equals() method
  
import java.util.*;
  
public class Abstract_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty AbstractMap
        AbstractMap<Integer, String>
            abstract_hash1 = new IdentityHashMap<Integer, String>();
  
        AbstractMap<Integer, String>
            abstract_hash2 = new IdentityHashMap<Integer, String>();
  
        // Mapping string values to int keys
        abstract_hash1.put(10, "Geeks");
        abstract_hash1.put(15, "4");
        abstract_hash1.put(20, "Geeks");
        abstract_hash1.put(25, "Welcomes");
        abstract_hash1.put(30, "You");
  
        // Mapping string values to int keys
        abstract_hash2.put(10, "Geeks");
        abstract_hash2.put(15, "4");
        abstract_hash2.put(20, "Geek");
        abstract_hash2.put(25, "Welcomes");
        abstract_hash2.put(30, "You");
  
        // Displaying the IdentityHashMap
        System.out.println("First Map:"
                           + abstract_hash1);
  
        // Displaying the final IdentityHashMap
        System.out.println("Second Map:"
                           + abstract_hash2);
  
        // Displaying the equality
        System.out.println("Equality:"
                           + abstract_hash1.equals(abstract_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 AbstractMap equals() Method in Java with Examples。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。