Java Hashtable equals（）方法与示例

灰太狼 2023-03-05 15:53 18阅读 0赞

## 哈希表类equals()方法 **(**Hashtable Class equals() method**)** ##

*  **equals() method** is available in java.util package.
    
    **equals()方法**在java.util包中可用。
 *  **equals() method** is used to check whether equality of this Hashtable with the given Object or not.
    
    **equals()方法**用于检查此Hashtable与给定Object是否相等。
 *  **equals() method** is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
    
    **equals()方法**是一种非静态方法，仅可通过类对象访问，如果尝试使用类名访问该方法，则会收到错误消息。
 *  **equals() method** does not throw an exception at the time of checking the equality of two objects.
    
    在检查两个对象的相等性时， **equals()方法**不会引发异常。

**Syntax:**

**句法：**

public boolean equals(Object ob);

**Parameter(s):**

**参数：**

*  Object ob – represents the object to be checked for equality.
    
    对象ob –表示要检查其是否相等的对象。

**Return value:**

**返回值：**

The return type of the method is boolean,

方法的返回类型为boolean 。

*  It returns **true** when this Hashtable is the same as the given object.
    
    当此Hashtable与给定对象相同时，它返回**true** 。
 *  It returns **false** when this Hashtable is not the same as the given object.
    
    当此哈希表与给定对象不同时，它返回**false** 。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of boolean equals(Object ob) method of Hashtable 
    
    import java.util.*;
    
    public class EqualsOfHashtable {
        
        public static void main(String[] args) {
        
            // Instantiate two hashtable object  
            Hashtable ht = new Hashtable();
            Hashtable comp_ht = new Hashtable();
    
            // By using put() method is to
            // add the linked values in an Hashtable ht
            ht.put(10, "C");
            ht.put(20, "C++");
            ht.put(30, "JAVA");
            ht.put(40, "PHP");
            ht.put(50, "SFDC");
    
            // By using put() method is to
            // add the linked values in an
            // Hashtable comp_ht
            comp_ht.put(60, "COBOL");
            comp_ht.put(70, "HTML");
    
            // Display Hashtable
            System.out.println("Hashtable: " + ht);
    
            // By using equals() method isto
            // check equality of two hashtable objects
            boolean status = ht.equals(comp_ht);
    
            // Display Status of Hashtable
            System.out.println("ht.equals(comp_ht): " + status);
        }
    }

**Output**

**输出量**

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
    ht.equals(comp_ht): false

> 翻译自: [https://www.includehelp.com/java/hashtable-equals-method-with-example.aspx][https_www.includehelp.com_java_hashtable-equals-method-with-example.aspx]

[https_www.includehelp.com_java_hashtable-equals-method-with-example.aspx]: https://www.includehelp.com/java/hashtable-equals-method-with-example.aspx