Java ArrayList toString() Method

December 9, 2022

What exactly is an ArrayList?

ArrayList gives us resizable arrays. Because ArrayLists are resizable, we can add or remove elements at any time. It is not required to mention size when declaring it. The ArrayList class is included in the Java framework and can be found in the java.util package. ArrayList has many built-in methods that we can use.

This page will cover the Java ArrayList toString() method.

Java ArrayList toString() Method

In Java, all classes are directly or indirectly subclasses of object classes. The toString() method is in the object class. The toString() method converts an array list to a string. Let’s see how to use this method, its syntax, parameters and return value with an example.

Syntax :

ArrayList.toString();

Parameters:

This method does not take any parameters.

Return values :

It returns string representing the arraylist.

Important: The toString() method presents inside the object class. The ArrayList class does not have its own toString() method. It overrides this method from the object class.

Polymorphism in Java

Encapsulation in Java

Abstraction in Java

Multithreading in Java

ArrayList toString() Method

Example :

Run

import java.util.ArrayList;

class Main
{
  public static void main (String[]args)
  {
    // creating an Integer ArrayList
    ArrayList < String > list = new ArrayList <> ();

    // adding elements in the list
    list.add ("asd");
    list.add ("qwe");
    list.add ("qwed");
    list.add ("qaz");
    list.add ("wsdc");

    // convert arraylist to string using toString() method

    String result = list.toString ();

    // printing the string
      System.out.println ("The new string is : " + result);
  }
}

Output :

The new string is : [asd, qwe, qwed, qaz, wsdc]

What happened above: In the above code we called a method toString() which converts the arraylist into a string named as 'result'. Now the string represents the arraylist as a string including '[' , ']' and ',' as characters of the string. That's why in the output these three characters are present.

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Java ArrayList toString() Method

What exactly is an ArrayList?

Java ArrayList toString() Method

Syntax :

Parameters:

Return values :

ArrayList toString() Method

Example :

Output :

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