ArrayList.remove(int) in Java

ArrayList.remove(int): This method is available in java.util.ArrayList class of Java.

Syntax:

E java.util.ArrayList.remove(int index)

This method takes one argument of type int as its parameter. This method removes the element at the specified position in this list.

Parameters: One parameter is required for this method.

index: the index of the element to be removed.

Returns: the element that was removed from the list.

Throws:

IndexOutOfBoundsException - if the index is out of range(index < 0 || index >= size())

Approach 1: When no exception

Java

import java.util.ArrayList;

public class ArrayListRemove {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>();
        arr.add(1);
        arr.add(2);
        arr.add(4);
        System.out.println("Size before remove " + arr.size());

        arr.remove(0);

        System.out.println("Size after remove " + arr.size());
    }

}

Output:

Size before remove 3

Size after remove 2

Approach 2: IndexOutOfBoundsException 

Java

import java.util.ArrayList;

public class ArrayListRemove {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>();
        arr.add(1);
        arr.add(2);
        arr.add(4);
        System.out.println("Size before remove " + arr.size());

        arr.remove(4);

        System.out.println("Size after remove " + arr.size());
    }

}

Output:

Size before remove 3
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 4 out of bounds for length 3
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
	at java.base/java.util.Objects.checkIndex(Objects.java:359)
	at java.base/java.util.ArrayList.remove(ArrayList.java:504)