How Sting Joiner Class Works in JAVA Programming

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Java StringJoiner

Java added a new final class StringJoiner in java.util package. It is used to construct a sequence of characters separated by a delimiter. Now, you can create string by passing delimiters like comma(,), hyphen(-) etc. You can also pass prefix and suffix to the char sequence.

Java StringJoiner Example

1. // importing StringJoiner class  
2. import java.util.StringJoiner;  
3. public class StringJoinerExample {  
4.     public static void main(String[] args) {  
5.         StringJoiner joinNames = new StringJoiner(","); // passing comma(,) as delimiter   
6.           
7.         // Adding values to StringJoiner  
8.         joinNames.add("Rahul");  
9.         joinNames.add("Raju");  
10.         joinNames.add("Peter");  
11.         joinNames.add("Raheem");  
12.                   
13.         System.out.println(joinNames);  
14.     }  
15. }  

Java StringJoiner Example: adding prefix and suffix

1. // importing StringJoiner class  
2. import java.util.StringJoiner;  
3. public class StringJoinerExample {  
4.     public static void main(String[] args) {  
5.         StringJoiner joinNames = new StringJoiner(",", "[", "]");   // passing comma(,) and square-brackets as delimiter   
6.           
7.         // Adding values to StringJoiner  
8.         joinNames.add("Rahul");  
9.         joinNames.add("Raju");  
10.         joinNames.add("Peter");  
11.         joinNames.add("Raheem");  
12.                   
13.         System.out.println(joinNames);  
14.     }  
15. }  

StringJoiner Example: Merge Two StringJoiner

1. // importing StringJoiner class  
2. import java.util.StringJoiner;  
3. public class StringJoinerExample {  
4.     public static void main(String[] args) {  
5.   
6.         StringJoiner joinNames = new StringJoiner(",", "[", "]");   // passing comma(,) and square-brackets as delimiter   
7.           
8.         // Adding values to StringJoiner  
9.         joinNames.add("Rahul");  
10.         joinNames.add("Raju");  
11.   
12.         // Creating StringJoiner with :(colon) delimiter  
13.         StringJoiner joinNames2 = new StringJoiner(":", "[", "]");  // passing colon(:) and square-brackets as delimiter   
14.           
15.         // Adding values to StringJoiner  
16.         joinNames2.add("Peter");  
17.         joinNames2.add("Raheem");  
18.   
19.         // Merging two StringJoiner  
20.         StringJoiner merge = joinNames.merge(joinNames2);   
21.         System.out.println(merge);  
22.     }  
23. }