Java.util.ArrayList.trimToSize() Method

Description

The java.util.ArrayList.trimToSize() method trims the capacity of this ArrayList instance to be the list's current size. An application can use this operation to minimize the storage of an ArrayList instance.

Declaration

Following is the declaration for java.util.ArrayList.trimToSize() method

public void trimToSize()

Parameters

• NA

Return Value

This method does not return any value.

Exception

• NA

Example

The following example shows the usage of java.util.Arraylist.trimToSize() method.

package com.tutorialspoint;

import java.util.ArrayList;

public class ArrayListDemo {
  public static void main(String args[]) {

    // create an empty array list with an initial capacity
    ArrayList<Integer> arrlist = new ArrayList<Integer>(5);
	
    // use add() method to add elements in the list
    arrlist.add(35);
    arrlist.add(20);
    arrlist.add(25);
	
    // Trim the arraylist
    arrlist.trimToSize();

    // let us print all the elements available in list
    for (Integer number : arrlist) {
      System.out.println("Number = " + number);
    }
  }
} 

Let us compile and run the above program, this will produce the following result:

Number = 35
Number = 20
Number = 25