java enum方法_Java Enum clone（）方法与示例

布满荆棘的人生 2023-03-05 12:41 30阅读 0赞

java enum方法

## 枚举类clone()方法 **(**Enum Class clone() method**)** ##

*  **clone() method** is available in java.lang package.
    
    **clone()方法**在java.lang包中可用。
 *  **clone() method** is used to give assurance that enum cannot be cloned () (i.e. we cannot copy enum objects) which is required to maintain the “singleton” behavior of the properties.
    
    **clone()方法**用于确保不能克隆枚举(即无法复制枚举对象)，这是保持属性的“单例”行为所必需的。
 *  **clone() 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.
    
    **clone()方法**是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
 *  **clone() method** is a final method so it is not overridable in child class.
    
    **clone()方法**是最终方法，因此在子类中不可重写。
 *  **clone() method** may throw an exception at the time of not cloning an enum
    
    不克隆枚举时， **clone()方法**可能会引发异常
    
    **CloneNotSupportedException**: This exception may throw when an object class does not implement a Cloneable interface and in that case, if child class overrides clone() method may throw **CloneNotSupportedException** to represent that an instance cannot be copied or closed.
    
    **CloneNotSupportedException** ：当对象类未实现Cloneable接口时，可能会引发此异常，并且在这种情况下，如果子类重写clone()方法可能会引发**CloneNotSupportedException，**以表示无法复制或关闭实例。

**Syntax:**

**句法：**

protected 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 this method is Object, it returns nothing.

该方法的返回类型为Object ，不返回任何内容。

**Example:**

**例：**

// Java program to demonstrate the example 
    // of Object clone() method of Enum 
    
    enum Weeks {
        
        SUN,
        MON,
        TUE,
        WED,
        THU,
        FRI,
        SAT;
    }
    public class Clone {
        
        public static void main(String args[]) throws CloneNotSupportedException {
        
    
            System.out.println("Enum can't be cloned");
    
            Clone cl = new Clone() {
        
    
                protected final Object clone() throws CloneNotSupportedException {
        
    
                    return new CloneNotSupportedException();
                }
            };
    
            System.out.println(cl.clone());
        }
    }

**Output**

**输出量**

Enum can't be cloned
    java.lang.CloneNotSupportedException

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

java enum方法

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