Arraylist string android

Example 1: Convert the Arraylist into a String

import java.util.ArrayList; class Main { public static void main[String[] args] { ArrayList languages= new ArrayList[]; // Add elements in the array list languages.add["Java"]; languages.add["Python"]; languages.add["JavaScript"]; System.out.println["ArrayList: " + languages]; // convert the arraylist into a string String arraylist = languages.toString[]; System.out.println["String: " + arraylist]; } }

Output

ArrayList: [Java, Python, JavaScript] String: [Java, Python, JavaScript]

In the above example, we have created an arraylist named languages. Notice the line,

languages.toString[];

Here, the toString[] method converts arraylist into a string. The entire arraylist is converted as a single string.

Note: We can also convert the arraylist into a string array. To learn more, visit Java ArrayList to Array Conversion.

Example 2: Convert ArrayList to String Using join[]

import java.util.ArrayList; class Main { public static void main[String[] args] { ArrayList languages= new ArrayList[]; // Add elements in the array list languages.add["Java"]; languages.add["Python"]; languages.add["JavaScript"]; System.out.println["ArrayList: " + languages]; // convert the arraylist into a string String arraylist = String.join[", ", languages]; System.out.println["String: " + arraylist]; } }

Output

ArrayList: [Java, Python, JavaScript] String: Java, Python, JavaScript

In the above example, we have used the join[] method of the String class to convert the arraylist into a string. To learn more, visit Java String join[].

Example 3: Convert a String to ArrayList

import java.util.ArrayList; import java.util.Arrays; class Main { public static void main[String[] args] { // create a string String str = "Java, JavaScript, Python"; System.out.println["String: " + str]; // convert the string into an array String[] arr = str.split[","]; // create an arraylist from the string ArrayList languages = new ArrayList[Arrays.asList[arr]]; System.out.println["ArrayList: " + languages]; } }

Output

String: Java, JavaScript, Python ArrayList: [Java, JavaScript, Python]

In the above example, we have created a string named str. We have used the split[] method to convert the given string into an array. To learn more about splitting a string, visit Java String split[].

Notice the expression,

Arrays.asList[arr]

The asList[] method converts the string array into an arraylist.