Java list remove Integer

The ArrayList.remove[int index] method to remove element from ArrayList. Remove method is overloaded.

1. ArrayList.remove[E element] remove the element at specifid index.
2. ArrayList.remove[E element] remove the element by value.
3. ArrayList.removeIf[Predicate p] remove all elements by specified value.

1. ArrayList.remove[int index] remove element from arraylist at specified index

This method removes the specified element E at the specified position in this list. It removes the element currently at that position and all subsequent elements are moved to the left [will subtract one to their indices].

Index start with 0.

public class ArrayListExample { public static void main[String[] args] { ArrayList namesList = new ArrayList[Arrays.asList[ "alex", "brian", "charles"] ]; System.out.println[namesList]; //list size is 3 //Add element at 1 index namesList.remove[1]; System.out.println[namesList]; //list size is 2 } }

Program output.

[alex, brian, charles] [alex, charles]

2. ArrayList.remove[E element] remove element from arraylist by element value

This method removes the first occurrence of specified element E in this list. As this method removes the custom object, the list size decreases by one.

Index start with 0.

public class ArrayListExample { public static void main[String[] args] { ArrayList namesList = new ArrayList[Arrays.asList[ "alex", "brian", "charles", "alex"] ]; System.out.println[namesList]; namesList.remove["alex"]; System.out.println[namesList]; } }

Program output.

[alex, brian, charles, alex] [brian, charles, alex]

3. Remove all element from arraylist by value

ArrayList does not provide inbuilt method to remove all elements by specified value. We can use other super easy syntax from Java 8 stream to remove all elements for given element value.

Java program to use List.removeIf[] for how to remove multiple elements from arraylist in java by element value.

public class ArrayListExample { public static void main[String[] args] { ArrayList namesList = new ArrayList[Arrays.asList[ "alex", "brian", "charles", "alex"] ]; System.out.println[namesList]; namesList.removeIf[ name -> name.equals["alex"]]; System.out.println[namesList]; } }

Program output.

[alex, brian, charles, alex] [brian, charles]

Happy Learning !!

Read More:

A Guide to Java ArrayList
ArrayList Java Docs