This is an example of how to replace elements in an ArrayList using index. Replacing elements in an ArrayList using index implies that you should:
- Create a new ArrayList.
- Populate the arrayList with elements, using
add(E e)API method of ArrayList. - Use
set(int index, Object obj)method of ArrayList, using a specified element and a specified index. The method replaces an element at the specified index of the arrayList with the given element. It returns the element previously at the specified position.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.ArrayList;
public class ReplaceElementArrayListIndex {
public static void main(String[] args) {
// Create an ArrayList and populate it with elements
ArrayList arrayList = new ArrayList();
arrayList.add("element_1");
arrayList.add("element_2");
arrayList.add("element_3");
/*
Use Object set(int index, Object obj) operation to replace an element at
the specified index of ArrayList. It returns the element previously at
the specified position.
*/
arrayList.set(1,"element_4");
System.out.println("Elements in ArrayList :");
for(int i=0; i < arrayList.size(); i++)
System.out.println(arrayList.get(i));
}
}
Output:
Elements in ArrayList :
element_1
element_4
element_3
This was an example of how to replace elements in an ArrayList using index in Java.
