Convert List to String Java 8

Here we will see how to convert List to String comma separated values using Java 8.

List to String Comma Separated:

Lets take a simple java List, filled with Strings of elements.

1. List to String using String.join[]:

List countries = Arrays.asList["Java","Spring","Hibernate","Python","C"]; String countrieswithComma = String.join[",",countries]; System.out.println[countrieswithComma];

Output:

Java,Spring,Hibernate,Python,C

2. List to String comma separate using Streams:

Java 8 streams are beneficial to collect data in different formats.

List countries = Arrays.asList["Java","Spring","Hibernate","Python","C"]; String countrieswithComma = countries.stream[].collect[Collectors.joining[","]]; System.out.println[countrieswithComma];

Output:

Java,Spring,Hibernate,Python,C

3. List to comma separate strings using Java 7:

If you are using legacy java version [before Java 8], you can even convert the list to string comma separate values by using the following logic.

List countries = Arrays.asList["Java","Spring","Hibernate","Python","C"]; StringBuffer buffer = new StringBuffer[]; for [String country : countries]{ buffer.append[country].append[","]; } buffer.deleteCharAt[buffer.lastIndexOf[","]]; // To remove leading comma countrieswithComma= buffer.toString[]; System.out.println[countrieswithComma];

Output:

Java,Spring,Hibernate,Python,C

References:

• Java 8 Streams
• Java 8 Stream to List

Happy Learning