The set(E e) method in the class CopyOnWriteArrayList class replaces the element at the specified index with the element provided as a 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 The method returns the element that has been replaced by the new element.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 that 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:
Java
// Program to illustrate the use of set() methodimport 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, "neveropen"); // 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 calling set() method:" + returnValue); // print CopyOnWriteArrayList System.out.println("CopyOnWriteArrayList " + "after calling set():" + arrayList); }} |
Program 2:
Java
// Program to illustrate the ArrayIndexOutOfBoundsExceptionimport 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, "neveropen"); // before invoking the set() method System.out.println("CopyOnWriteArrayList: " + arrayList); try { System.out.println("Trying to add " + "element at index 4 " + "using set() method"); // invoking the set() method String returnValue = arrayList.set(4, "toodles"); // printing the returned value } catch (Exception e) { System.out.println(e); } }} |
