Java ArrayList clone()用法及代码示例

Java.util.ArrayList.clone()方法用于创建所提及数组列表的浅拷贝。它只是创建列表的副本。

用法:

ArrayList.clone()

参数：此方法不带任何参数。

返回值：此函数返回“链接列表”实例的副本。

以下示例程序旨在说明Java.util.ArrayList.clone()方法：

示例1:

// Java code to illustrate clone() method 
  
import java.io.*; 
import java.util.ArrayList; 
  
public class ArrayListDemo { 
  
    public static void main(String args[]) 
    { 
  
        // Creating an empty ArrayList 
        ArrayList<String> list 
            = new ArrayList<String>(); 
  
        // Use add() method 
        // to add elements in the list 
        list.add("Geeks"); 
        list.add("for"); 
        list.add("Geeks"); 
        list.add("10"); 
        list.add("20"); 
  
        // Displaying the list 
        System.out.println("First ArrayList: "
                           + list); 
  
        // Creating another linked list and copying 
        ArrayList sec_list = new ArrayList(); 
        sec_list = (ArrayList)list.clone(); 
  
        // Displaying the other linked list 
        System.out.println("Second ArrayList is: "
                           + sec_list); 
    } 
}

输出：

First ArrayList: [Geeks, for, Geeks, 10, 20]
Second ArrayList is: [Geeks, for, Geeks, 10, 20]

示例2:

// Java code to illustrate clone() method 
  
import java.io.*; 
import java.util.ArrayList; 
  
public class ArrayListDemo { 
  
    public static void main(String args[]) 
    { 
  
        // Creating an empty ArrayList 
        ArrayList<Integer> list 
            = new ArrayList<Integer>(); 
  
        // Use add() method 
        // to add elements in the list 
        list.add(10); 
        list.add(20); 
        list.add(30); 
        list.add(40); 
        list.add(50); 
  
        // Displaying the list 
        System.out.println("First ArrayList: "
                           + list); 
  
        // Creating another linked list and copying 
        ArrayList sec_list = new ArrayList(); 
        sec_list = (ArrayList)list.clone(); 
  
        // Displaying the other linked list 
        System.out.println("Second ArrayList is: "
                           + sec_list); 
    } 
}

输出：

First ArrayList: [10, 20, 30, 40, 50]
Second ArrayList is: [10, 20, 30, 40, 50]

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注：本文由纯净天空筛选整理自_Gaurav_Tiwari大神的英文原创作品 ArrayList clone() 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。