Java String.join() Method
December 08, 2022
String.join() method in our Java application.
Find the Java doc of
String.join() method.
static String join(CharSequence delimiter, CharSequence... elements) static String join(CharSequence delimiter, Iterable<? extends CharSequence> elements)
Parameters:
The delimiter as
CharSequence is the delimiter that separates each element.
The elements as
CharSequence or Iterable, are the elements to join together.
Returns:
A new string of elements separated by the delimeter.
Throws:
NullPointerException : If delimiter or elements is null.
Examples using Elements as CharSequence
1.
String result = String.join("-", "My", "country", "name", "is", "India");
System.out.println(result);
My-country-name-is-India
String result = String.join(",", "Ram", "Shyam", "Krishn", "Mohan");
System.out.println(result);
Ram,Shyam,Krishn,Mohan
String date = String.join("-", "15", "10", "1998");
String time = String.join(":", "10", "35", "45");
System.out.println(date + " "+ time);
15-10-1998 10:35:45
Examples using Elements as Iterable
We can use elements asIterable containing the element of CharSequence type. Iterable elements are List, Set and Queue and they should contain String, StringBuffer, StringBuilder etc.
Find the examples to join the elements.
1.
List<String> list = Arrays.asList("One", "Two", "Three", "Four");
String s = String.join("+", list);
System.out.println(s);
One+Two+Three+Four
Set<String> set = new HashSet<>();
set.add("India");
set.add("UP");
set.add("Varanasi");
String s = String.join("-", set);
System.out.println(s);
Varanasi-UP-India
ArrayBlockingQueue<String> abq = new ArrayBlockingQueue<String>(3);
abq.put("Krishn");
abq.put("Suresh");
abq.put("Mahesh");
String s = String.join("|", abq);
System.out.println(s);
Krishn|Suresh|Mahesh
