Java.util.ArrayList.trimToSize() Method


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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.

Live Demo
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

java_util_arraylist.htm

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