What sort of error does it give you? Also, don't use indexOf(foo) just to find the index of the thing you want to delete. Just do remove(foo). Answer from captainAwesomePants on reddit.com
Kotlin
kotlinlang.org › docs › whatsnew23.html
What's new in Kotlin 2.3.0 | Kotlin Documentation
4 weeks ago - The new explicit syntax simplifies the common backing properties pattern where a property's internal type is different from its exposed API type. For example, you might use an ArrayList while exposing it as a read-only List or a MutableList.
Reddit
reddit.com › r/learnprogramming › how do i remove an object from an arraylist and delete it in java?
r/learnprogramming on Reddit: How do I remove an object from an arraylist and delete it in java?
March 11, 2021 -
So, basically I want to do a shopping list that you can put the price, quantity, name. I want to implement a button that deletes an object. I have tried doing "int s = objectList.indexOf(myobject); objectList.remove(s); myobject=null;", but it keeps giving me errors. Please help me, if you need any code from my project, I will give it. Btw, the object extends JPanel
java - How to delete specific element from array list - Stack Overflow
Im trying but its not good. Here is all code: //creating passener object Passenger passenger1 = new Passenger(1, "Stefan", "Jankovic", "stefan@gmail.com", 300... More on stackoverflow.com
java - Circular Linked List Implementation - Code Review Stack Exchange
I am currently taking a data structures course at my university right now. I've recently learned about linked lists. Here is my attempt at creating a doubly circular linked list in Java. Is there More on codereview.stackexchange.com
(Java) Can't remove element from List/ArrayList, always gives NullPointerException or ConcurrentModificationException.
You add every line to the list, but the last line of the file will always return null. You correctly end the loop at that point, but you still add null to the list. That's what is giving those nullpointer exceptions More on reddit.com
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October 27, 2019How does an ArrayList remove an element from an array?
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March 15, 2023Videos
09:01
Remove elements from an arraylist in Java - YouTube
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How to remove an element from ArrayList in Java | Java ArrayList ...
Search And Remove From ArrayLists (Java Tutorial)
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remove method in ArrayList - YouTube
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ArrayList Part 3: Remove (JAVA) - YouTube
W3Schools
w3schools.com › java › ref_arraylist_remove.asp
Java ArrayList remove() Method
If a value is specified and multiple elements in the list have the same value then only the first one is deleted. If the list contains integers and you want to delete an integer based on its value you will need to pass an Integer object. See More Examples below for an example. ... T refers to the data type of items in the list. Remove an integer from the list by position and by value: import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<Integer> list = new ArrayList<Integer>(); list.add(5); list.add(8); list.add(9); list.add(1); list.remove(Integer.valueOf(1)); // Remove by object list.remove(1); // Remove by index System.out.println(list); } }
JavaGoal
javagoal.com › home › how to remove element from arraylist java
remove element from ArrayList java and remove(), removeIf() - JavaGoal
July 26, 2020 - Where, Object represents the type of class in ArrayList . obj is the element which you want to remove from the ArrayList . return type: Its return type is boolean. It can return either true or false. If specified obj presents in ArrayList then it returns true after removal of obj otherwise it returns false. import java.util.ArrayList; public class ArrayListExample { public static void main(String[] args) { ArrayList<String> listOfNames = new ArrayList<String>(); listOfNames.add("JAVA"); listOfNames.add("GOAL"); listOfNames.add("Learning"); listOfNames.add("GOAL"); System.out.println("Before re
Baeldung
baeldung.com › home › java › java collections › removing elements from java collections
Removing Elements from Java Collections | Baeldung
January 8, 2024 - Collection<String> names = new ArrayList<>(); names.add("John"); names.add("Ana"); names.add("Mary"); names.add("Anthony"); names.add("Mark"); Java’s Iterator enables us to both walk and remove every individual element within a Collection.
CODEDOST
codedost.com › home › java › collections in java › remove element from a specific index in arraylist in java
Remove element from a specific index in ArrayList in JAVA | CODEDOST
July 27, 2021 - remove an element from a specific index in ArrayList in JAVA, we need to use the remove(int index) method of Java.util.ArrayList class. remove(int index) method will remove the specified element from the Arraylist
Coderanch
coderanch.com › t › 627559 › java › remove-item-Arraylist-looping
How to remove a item from Arraylist without looping it (Java in General forum at Coderanch)
January 25, 2014 - i have a Array-list which contain list of names.I need to remove one name.I can do this using for loop and find the index of element and delete it.But i need to delete it without looping.Is there any method to delete element by name? or can i use any other Data Structure in Java for this issue? ... You don't need to loop. There's already an API http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#remove(java.lang.Object) ... Thanks Jaikiran. ... sam liyanage wrote:But i need to delete it without looping. I don't know where that requirement came from; let me point out that the ArrayList.remove(Object) very likely uses looping to achieve its goal.
Java67
java67.com › 2015 › 06 › how-to-remove-elements-from-arraylist.html
How to Delete Objects from ArrayList in Java? ArrayList.remove() method Example | Java67
For example, a call to remove("two") will remove the second element from ArrayList. Though you should remember to use the Iterator or ListIterator remove() method to delete elements while iterating, using ArrayList's remove methods, in that case, will throw ConcurrentModificationException in Java.
Top answer 1 of 4
1
The problem you have right now is you're just removing an element from the list's index based on user input while you should make sure list is of that size. Second thing, You can't remove an element from the list while browsing it via the forEach loop, you would get a ConcurrentModificationException , read concurrentModificationException. The way to do it would be using an iterator, check
CopyIterator<Passenger> itr = passengerList.iterator();
while (itr.hasNext()){
Passenger p = itr.next();
if (id == p.getId()) {
itr.remove();
break;
}
}
2 of 4
0
if you want to remove passenger from ArrayList using your passenger id, you can create your own delete function.
Copypublic void removeList(ArrayList<Passenger> passengerList, int passengerId) {
for (int i = 0; i<passengerList.size(); i++) {
if (passengerList.get(i).getId() == passengerId) {
passengerList.remove(i);
}
}
}
You can use like this
Copy@Override
public void deletePassenger(ArrayList<Passenger> passengerList) {
System.out.println("---Passengers list--");
for (Passenger tempPassenger : passengerList) {
System.out.println(tempPassenger);
System.out.println("If you want to see options menu, enter 6");
}
System.out.println("Enter ID of passenger that you want to delete!");
int id = scanner.nextInt();
scanner.nextLine();
System.out.println("---Passengers list--");
removeList(passengerList, id);
}
coderolls
coderolls.com › remove-element-from-arraylist
How To Remove An Element From An ArrayList? - Coderolls
December 2, 2021 - remove(Object o) - we can remove the specified object from the ArrayList · remove(int index) - We can remove an element at the position (index) specified · The example Java programs given in the above tutorial can be found at this GitHub Repository.
Quora
quora.com › What-does-the-remove-of-the-arraylist-element-mean
What does the remove of the arraylist element mean? - Quora
Answer (1 of 2): Yep, when an item is removed from an ArrayList, all items after it will move forward to fill the space. If you remove element four (which is what list.remove(4); does), all the items after item number 5 (lists are zero indexed) ...
Top answer 1 of 5
5
Error handling
I would expect the following to:
- Write errors to
System.errrather thanSystem.out. - Better yet, throw a
java.lang.IllegalArgumentExceptionthat can be handled accordingly by the caller.
public void remove(int index) { int counter = 1; int currentSize = size(); if (index > currentSize + 1 || index <= 0) { System.out.println("Invalid index."); return; }
Throwing an exception also simplifies, because the return is no longer necessary.
Indexing
You also seem to be indexing starting at 1 rather than 0. This is inconsistent with pretty much any other indexed data structure in Java or most other modern, mainstream programming language.
Iteration
Many operations (like printing a string representation) on your list your become easier if you implement an operator over lists.
2 of 5
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I think it is unfortunate that insert and remove call size. While I understand that you would want to reject a bad index early in the function, calling size gives these functions the property that inserting/removing cost time linear in the size of the list, not linear in the index as may be expected (or hoped for). The out-of-range-ness could be detected during the (inevitable) iteration up to the insertion/removal index.
Generally data structures and algorithms should not print errors to System.out (where it may be mixed awkwardly in the middle of other output, or be invisible in GUI applications, etc, anyway it's a mixing of concerns), but report them to the caller.
W3Schools
w3schools.com › java › ref_arraylist_removeall.asp
Java ArrayList removeAll() Method
import java.util.ArrayList; public ... cars.removeAll(cars); System.out.println(cars); } } ... The removeAll() method removes all items from a list which belong to a specified collection....
GeeksforGeeks
geeksforgeeks.org › java › remove-all-occurrences-of-an-element-from-array-in-java
Remove all Occurrences of an Element from Array in Java - GeeksforGeeks
July 11, 2025 - Illustration: Using the ArrayList to remove all occurrences of an element from an array. ... // Java program remove all occurrences // of an element from Array using ArrayList import java.util.ArrayList; import java.util.Arrays; import java.util.List; // Driver Class public class Geeks { // Main Method public static void main(String[] args) { Integer[] a = { 3, 9, 2, 3, 1, 7, 2, 3, 5 }; // Element to be removed Integer k = 3; // Convert array to ArrayList List<Integer> l = new ArrayList<>(Arrays.asList(a)); // Remove all occurrences of the element l.removeAll(Arrays.asList(k)); // Convert ArrayList back to array Integer[] newArr = l.toArray(new Integer[0]); // Print the result System.out.println(Arrays.toString(newArr)); } }
CodeChef
codechef.com › practice › arrays
Practice Arrays
Solve Arrays coding problems to start learning data structures and algorithms. This curated set of 23 standard Arrays questions will give you the confidence to solve interview questions.
DigitalOcean
digitalocean.com › community › tutorials › java-remove-array-elements
How to Remove Array Elements in Java | DigitalOcean
May 2, 2025 - In this tutorial, we explored various methods for removing elements from arrays in Java, including using for loops, System.arraycopy(), and converting to an ArrayList. We also highlighted the advantages of using ArrayLists for frequent element deletion or addition due to their dynamic nature and built-in functions.
GeeksforGeeks
geeksforgeeks.org › java › remove-element-arraylist-java
How to remove an element from ArrayList in Java? - GeeksforGeeks
July 23, 2025 - It is a default method as soon as we do use any method over data structure it is basically operating over indexes only so whenever we do use remove() method we are basically removing elements from indices from an ArrayList. ArrayList class provides two overloaded remove() methods. remove(int index): Accepts the index of the object to be removed · remove(Object obj): Accepts the object to be removed · Let us figure out with the help of examples been provided below as follows: ... // Java program to Remove Elements from ArrayList // Using remove() method by indices // Importing required classe
Sarthaks eConnect
sarthaks.com › 3492998 › how-do-i-remove-elements-from-an-arraylist-in-java
How do I remove elements from an ArrayList in Java? - Sarthaks eConnect | Largest Online Education Community
April 25, 2023 - How do I remove elements from an ArrayList in Java?
TutorialsPoint
tutorialspoint.com › home › java/util › java arraylist remove object
Java ArrayList Remove Object
September 1, 2008 - The java.util.ArrayList.remove(Object) method removes the first occurrence of the specified element from this list, if it is present.If the list does not contain the element, it is unchanged.
Vultr
docs.vultr.com › java › standard-library › java › util › ArrayList › removeIf
Java ArrayList removeIf() - Filter Elements Conditionally | Vultr Docs
November 13, 2024 - The removeIf() method in Java's ArrayList class offers a straightforward way to remove elements from a list based on a condition specified via a lambda expression or predicate.