Check out the set(int index, E element) method in the List interface
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Check out the set(int index, E element) method in the List interface
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You can replace the items at specific position using set method of ArrayList as below:
list.set( your_index, your_item );
But the element should be present at the index you are passing inside set() method else it will throw exception.
Also you can check oracle doc here
Baeldung
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Replace Element at a Specific Index in a Java ArrayList | Baeldung
April 3, 2025 - First, we create an ArrayList with five elements. Then, we replace the third element with the value 7, having index 2 with 3. Finally, we can see that index 2 with value 7 is removed from the list and updated with the new value 3. Also, note that the list size is not impacted. In this quick article, we learned how to replace an element at a specific index in Java ArrayList.
Which method is used to replace the element at a specific index in an ArrayList in Java? Question 6Select one: a. set() b. replace() c. modify() d. assign()
The set() method takes two parameters: the index of the element to be replaced and the new element that will replace it. It updates the ArrayList by replacing the element at the specified index with the new element. More on studocu.com
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October 2, 2023java - ArrayList replace element if exists at a given index? - Stack Overflow
How to replace element if exists in an ArrayList at a given index? More on stackoverflow.com
(Java)Edit element in an arrayList
When in doubt check the docs https://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html You can do ArrayList.get(int index) Animals animals = a.get(index); animals.doStuff(); More on reddit.com
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June 19, 2016A better way to find the index of an element in an array?
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August 27, 2022Java Code Geeks
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Java ArrayList Insert/Replace At Index - Java Code Geeks
January 2, 2022 - List2 values before insertion - ... or replace the existing value with the new value of ArrayList, use set(int index, E element) with the index and new value....
Codemia
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Java ArrayList replace at specific index
Enhance your system design skills with over 120 practice problems, detailed solutions, and hands-on exercises
CodeGym
codegym.cc › java blog › java collections › how to replace an element in java arraylist
How to Replace an Element in Java ArrayList
October 11, 2023 - So, we replace it by Tuesday at the 1st index. This is done by using the set() method. Where index “1” and replacing text i-e “Tuesday” is passed. Later, we print out the ArrayList on the console to see the updates.
Vultr
docs.vultr.com › java › standard-library › java › util › ArrayList › set
Java ArrayList set() - Replace Element | Vultr Docs
November 13, 2024 - Use the set() method to replace the element at the specified index. ... ArrayList<String> colors = new ArrayList<>(Arrays.asList("Red", "Green", "Blue")); colors.set(1, "Yellow"); // Replace "Green" with "Yellow" System.out.println(colors); ...
How to do in Java
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Replace an Existing Item in ArrayList
January 12, 2023 - Once we have the index, we can use set() method to update the replace the old element with a new item. Find the index of an existing item using indexOf() method. Use set(index, object) to update with the new item.
GeeksforGeeks
geeksforgeeks.org › java › how-to-replace-a-element-in-java-arraylist
How to Replace a Element in Java ArrayList? - GeeksforGeeks
July 23, 2025 - To replace an element in Java ArrayList, set() method of java.util. An ArrayList class can be used. The set() method takes two parameters the indexes of the element that has to be replaced and the new element. The index of an ArrayList is zero-based.
How to do in Java
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Add Element(s) at Specified Index to ArrayList in Java
August 7, 2023 - The new elements are always added to the end of current arraylist, unless we specifically mention the index where we want to add the new elements. ArrayList<String> arraylist = new ArrayList<>(); arraylist.add("apple"); // [apple] arraylist.add("banana"); // [apple, banana] //Adding a new element at index position 1 arraylist.add(1, "grapes"); // [apple, grapes, banana] //Adding multiple elements element at index position 0 arraylist.add(0, Arrays.asList("date", "guava")); // [date, guava, apple, grapes, banana]
Studocu
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[Solved] Which method is used to replace the element at a specific index - Programming 1 (CS 1102) - Studocu
October 2, 2023 - To replace the element at a specific index in an ArrayList in Java, you can use the set() method.
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arrayList.set(index i,String replaceElement);
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If you're going to be requiring different set functionaltiy, I'd advise extending ArrayList with your own class. This way, you won't have to define your behavior in more than one place.
// You can come up with a more appropriate name
public class SizeGenerousArrayList<E> extends java.util.ArrayList<E> {
@Override
public E set(int index, E element) {
this.ensureCapacity(index+1); // make sure we have room to set at index
return super.set(index,element); // now go as normal
}
// all other methods aren't defined, so they use ArrayList's version by default
}
JavaGoal
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replace element in an ArrayList and set() method - JavaGoal
July 27, 2020 - We have seen how to add and remove elements from ArrayList in java. But sometimes, there may be a situation when we want to replace the element in ArrayList. We can use set(int index, E element) to replace the element. The set(index, E element) method is used to set the specified element at ...
javaspring
javaspring.net › blog › java-arraylist-replace-at-specific-index
How to Replace an Element in Java ArrayList at Specific Index: Step-by-Step Guide with Example Method — javaspring.net
Return Value: Returns the old element that was replaced (of type E, the generic type of the ArrayList). Behavior: Replaces the element at index with element and returns the original element.
GeeksforGeeks
geeksforgeeks.org › java › java-program-to-replace-an-element-in-a-list
Java Program to Replace an Element in a List - GeeksforGeeks
January 7, 2026 - An ArrayList is created and initialized with integer values. The set(1, 200) method replaces the element at index 1 with 200. The updated list is printed to show the replaced value.
CodePal
codepal.ai › code generator › java arraylist replace index
Java ArrayList Replace Index - CodePal
December 21, 2023 - The ArrayListUtils class provides a static method called replaceIndex that takes an ArrayList of objects, the old index of the values to be replaced, and the new index where the values should be moved to.
javathinking
javathinking.com › blog › replace-element-at-a-specific-index-in-a-java-arraylist
Replace Element at a Specific Index in a Java ArrayList — javathinking.com
We first create an ArrayList named fruits and add some elements to it. Then we use the set method to replace the element at index 1 (which was "Banana") with "Mango".
Java67
java67.com › 2016 › 08 › how-to-replace-element-of-arraylist-in-java.html
How to replace an element of ArrayList in Java? Example | Java67
Our example replaces the 2nd element of the ArrayList by calling the ArrayList.set(1, "Introduction to Algorithms") because the index of the array starts from zero.
Java Code Geeks
examples.javacodegeeks.com › home › java development › core java › util › arraylist
Replace ArrayList elements using index example - Java Code Geeks
June 6, 2013 - 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.
IncludeHelp
includehelp.com › java-programs › replace-element-within-the-arraylist.aspx
Java program to replace element within the ArrayList
December 31, 2023 - Given an ArrayList and we have to replace element of it using Java program. ... import java.util.ArrayList; public class ExArrayReplace { public static void main(String[] args) { // Create an object of arrayList. ArrayList arrayList = new ArrayList(); //Add elements to arraylist. arrayList.add("55"); arrayList.add("25"); arrayList.add("368"); System.out.println("Original ArrayList..."); for (int index = 0; index < arrayList.size(); index++) System.out.println(arrayList.get(index)); // Enter the position and number for replace.
Javatpoint
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Replace Element in Arraylist Java - Javatpoint
Replace Element in Arraylist Java with java tutorial, features, history, variables, programs, operators, oops concept, array, string, map, math, methods, examples etc.