Java 中的数组列表克隆()方法，示例
原文:https://www . geesforgeks . org/ArrayList-clone-method-in-Java-with-examples/
Java.util.ArrayList 。clone()方法用于创建所述数组列表的浅拷贝。它只是创建了一个列表的副本。
语法:
ArrayList.clone()
参数:该方法不取任何参数。
返回值:该函数返回链表实例的副本。
下面的程序说明了 Java.util.ArrayList.clone()方法:
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);
}
}
Output:
First ArrayList: [Geeks, for, Geeks, 10, 20]
Second ArrayList is: [Geeks, for, Geeks, 10, 20]
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);
}
}
Output:
First ArrayList: [10, 20, 30, 40, 50]
Second ArrayList is: [10, 20, 30, 40, 50]
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