ArrayList.trimToSize() in Java

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

Syntax:

void java.util.ArrayList.trimToSize()

This method trims the capacity of this ArrayList instance to be the list's current size.

Parameters: NA

Returns: NA

Exceptions: NA

Approach

Java

import java.util.ArrayList;

public class ArrayListtrimToSize {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>(100);
        arr.add(1);
        arr.add(2);
        arr.add(3);
        arr.trimToSize();
        arr.forEach((n -> System.out.print(n + " ")));

    }
}

Output:

1 2 3