Java Hashtable clone（）方法与示例

拼搏现实的明天。 2023-03-05 13:29 63阅读 0赞

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

*  **clone() method** is available in java.util package.
    
    **clone()方法**在java.util包中可用。
 *  **clone() method** is used to clone this Hashtable or in other words, it returns cloned copy or shallow copy of this Hashtable.
    
    **clone()方法**用于克隆此哈希表，换句话说，它返回此哈希表的克隆副本或浅表副本。
 *  **clone() method** is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
    
    **clone()方法**是一种非静态方法，可通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **clone() method** does not throw an exception at the time of returning the cloned object.
    
    返回克隆对象时， **clone()方法**不会引发异常。

**Syntax:**

**句法：**

public Object clone();

**Parameter(s):**

**参数：**

*  It does not accept any parameter.
    
    它不接受任何参数。

**Return value:**

**返回值：**

The return type of the method is Object, it returns cloned copy of this Hashtable.

该方法的返回类型为Object ，它返回此Hashtable的克隆副本。

**Example:**

**例：**

// Java program is to demonstrate the example of
    // clone() method of Hashtable
    
    import java.util.*;
    
    public class CloneOfHashtable {
        
        public static void main(String[] args) {
        
            // Instantiate two hashtable object  
            Hashtable ht = new Hashtable();
            Hashtable clone_ht = new Hashtable();
    
            // By using put() method is to
            // add the linked values in an Hashtable
            ht.put(10, "C");
            ht.put(20, "C++");
            ht.put(30, "JAVA");
            ht.put(40, "PHP");
            ht.put(50, "SFDC");
    
            // Display Hashtable
            System.out.println("Hashtable: " + ht);
    
            // By using clone() method isto
            // clone this hashtable ht
            clone_ht = (Hashtable) ht.clone();
    
            // Display Cloned Hashtable
            System.out.println("ht.clone(): " + clone_ht);
        }
    }

**Output**

**输出量**

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

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

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