StringJoiner merge() method in Java 8

The merge() method of the StringJoiner class in Java 8 is used to merge the contents of the StringJoiner str, which is passed as a parameter. The content gets added as the next element.

The syntax is as follows:

public StringJoiner merge(StringJoiner str)

Here, str is the StringJoiner content to be merged.

To work with the StringJoiner in Java 8, import the following package:

import java.util.StringJoiner;

The following is an example to implement StringJoiner merge() method in Java:

Example

 Live Demo

import java.util.StringJoiner;
public class Demo {
   public static void main(String[] args) {
      // StringJoiner 1
      StringJoiner strJoin1 = new StringJoiner(" ");
      strJoin1.add("Asia");
      strJoin1.add("is");
      strJoin1.add("a");
      strJoin1.add("continent");
      strJoin1.add("and");
      System.out.println("StringJoiner 1 = "+strJoin1.toString());  
      // StringJoiner 2
      StringJoiner strJoin2 = new StringJoiner(" ");
      strJoin2.add("Tokyo");
      strJoin2.add("is");
      strJoin2.add("a");
      strJoin2.add("city");
      System.out.println("StringJoiner 2 = "+strJoin2.toString());
      StringJoiner mergedStr = strJoin1.merge(strJoin2);
      System.out.println("New StringJoiner (strJoin1 + strJoin2) = " + mergedStr);
   }
}

Output

StringJoiner 1 = Asia is a continent and
StringJoiner 2 = Tokyo is a city
New StringJoiner (strJoin1 + strJoin2) = Asia is a continent and Tokyo is a city