Java String join() method

Java String join() method returns a joined String with given delimiter

Syntax:

public static String join(CharSequence delimeter,charSequence...elements)
public static String join(CharSequence delimeter,Iterable<?extens charSequence>elements)

Parameters:

delimiter: char value to be added with each element

elements: char value to be attached with delimeter

Returns

It returns joined String or new String with delimeter

Throws

It throws NullPointerException if the Delimiter or element is null.

Java String join() method example 1

      public class javaStringJoinEx1
    { 
    public static void main(String args[])
    { 
    String s1=String.join("_","welcome","to","tutorialandexample"); 
    System.out.println(s1); 
       }
    }

Output:

welcome_to_tutorialandexample

Java String join() method example 2

    public class javaStringJoinEx2
    { 
      public static void main(String[] args)
 {
// join(CharSequence delimiter, CharSequence... elements)
String joined = String.join("-", "2018", "08", "18" );
System.out.println("----------------------"); 
   // prints length of string 
   System.out.println("Output of Join = " +joined); 
   System.out.println("----------------------"); 
   } 
}

Output:

Output of Join = 2018-08-18

Java String join()method example 3

    public class javaStringJoinEx3
    { 
        public static void main(String[] args) {         
            String date = String.join("/","18","08","2018");   
            System.out.print(date);   
            String time = String.join(":", "12","10","10"); 
            System.out.println(" "+time); 
        } 
    }

Output:

18/08/2018 12:10:10