CopyOnWriteArrayList set() method in Java with Examples

The set(E e) method in the class CopyOnWriteArrayList class replaces the element at the specified index with the element provided as parameter to the method. The method returns the element that has been replaced by the new element.

Syntax:

public E set(int index, E element)

Parameters: The method takes two parameters mentioned below:



  • Index: Contains the position at which the new element is to replace the existing one. It is mandatory to add.
  • Element: Contains the new element to be replaced with.

Return Value: The method returns the element that has been replaced.

Exceptions: The method throws IndexOutOfBoundsException occurs when the method has an index which is either less than 0 or greater than the size of the list.

Below are some programs to illustrate the use of CopyOnWriteArrayList.set() method:

Program 1:

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// Program to illustrate the use of set() method
  
import java.util.concurrent.CopyOnWriteArrayList;
  
public class CopyOnWriteArrayListDemo {
    public static void main(String[] args)
    {
  
        // creating an ArrayList
        CopyOnWriteArrayList<String> arrayList
            = new CopyOnWriteArrayList<String>();
  
        // Adding elements to the list
        arrayList.add(0, "geeks");
        arrayList.add(1, "for");
        arrayList.add(2, "geeksforgeeks");
  
        // before invoking the set() method
        System.out.println("CopyOnWriteArrayList: "
                           + arrayList);
  
        // invoking the set() method
        String returnValue
            = arrayList.set(0, "toodles");
  
        // printing the returned value
        System.out.println("The value returned "
                           + "on caling set() method:"
                           + returnValue);
  
        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList "
                           + "after calling set():"
                           + arrayList);
    }
}

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Output:

CopyOnWriteArrayList: [geeks, for, geeksforgeeks]

The value returned on caling set() method: geeks

CopyOnWriteArrayList after calling set(): [toodles, for, geeksforgeeks]

Program 2:

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// Program to illustrate the ArrayIndexOutOfBoundsException
  
import java.util.concurrent.CopyOnWriteArrayList;
  
public class CopyOnWriteArrayListDemo {
    public static void main(String[] args)
    {
  
        // creating an ArrayList
        CopyOnWriteArrayList<String> arrayList
            = new CopyOnWriteArrayList<String>();
  
        // Adding elements to the list
        arrayList.add(0, "geeks");
        arrayList.add(1, "for");
        arrayList.add(2, "geeksforgeeks");
  
        // before invoking the set() method
        System.out.println("CopyOnWriteArrayList: "
                           + arrayList);
  
        try {
  
            System.out.println("Trying to add "
                               + "element at index 4 "
                               + "usiung set() method");
  
            // invoking the set() method
            String returnValue
                = arrayList.set(4, "toodles");
            // printing the returned value
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

CopyOnWriteArrayList: [geeks, for, geeksforgeeks]
Trying to add element at index 4 usiung set() method

java.lang.ArrayIndexOutOfBoundsException: 4


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