Java中的 CopyOnWriteArrayList clone() 方法

CopyOnWriteArrayList的clone()方法返回列表的浅表副本。浅拷贝在同一索引处包含完全相同的元素。

句法：

public Object clone()

参数：该函数不接受任何参数。

返回值：该函数返回列表的克隆。

下面的程序说明了上述函数：

方案一：

// Java Program to illustrate the 
// CopyOnWriteArrayList clone() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList ArrLis
            = new CopyOnWriteArrayList();
  
        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                           + ArrLis);
  
        // clone of the arraylist
        System.out.println("CopyOnWriteArrayList: "
                                    + ArrLis.clone());
    }
}

输出：

CopyOnWriteArrayList: [32, 67, 98, 100]
CopyOnWriteArrayList: [32, 67, 98, 100]

方案二：

// Java Program to illustrate the 
// CopyOnWriteArrayList clone() method in Java
  
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList ArrLis
            = new CopyOnWriteArrayList();
  
        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis);
  
        // clone of the arraylist
        System.out.println("CopyOnWriteArrayList: " 
                                  + ArrLis.clone());
    }
}

输出：

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]

参考： https: Java/util/concurrent/CopyOnWriteArrayList.html#clone–