The java.util.ArrayList.clone() returns a shallow copy of this ArrayList instance(i.e the elements themselves are not copied).

Java ArrayList clone() Method Example

The following example shows the usage of java.util.ArrayList.clone() method:

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String args[]) {

      // create an empty array list
      ArrayList<StringBuilder> arrlist1 = new ArrayList<StringBuilder>();

      // use add for new value
      arrlist1.add(new StringBuilder("Learning-"));

      // using clone to affect the objects pointed to by the references.
      ArrayList arrlist2 = (ArrayList) arrlist1.clone();

      // appending the string
      StringBuilder strbuilder = arrlist1.get(0);
      strbuilder.append("list1, list2-both pointing to the same StringBuilder");

      System.out.println("The 1st list prints: ");

      // both lists will print the same value, printing list1
      for (int i = 0; i < arrlist1.size(); i++) {
         System.out.print(arrlist1.get(i) + " ");
      }

      System.out.println("The 2nd list prints the same i.e:");

      // both lists will print the same value, printing list2
      for (int i = 0; i < arrlist2.size(); i++) {
         System.out.print(arrlist2.get(i));
      }
   }
}

Let us compile and run the above program, this will produce the following result −

The 1st list prints:
Learning-list1, list2 - both pointing to the same StringBuilder
The 2nd list prints the same i.e:
Learning-list1, list2 - both pointing to the same StringBuilder

Reference

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html

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