Java String.join() to Concatenates the string elements by using a delimiter to give a string output

String.join(delimiter, string1, string2,...) Joins the input strings by using delimiter and returns a string.
Here are some examples with output.

System.out.println(String.join("|", "Welcome","To","plus2net"));
System.out.println(String.join("/", "07","02","2020")); // 07/02/2020
System.out.println(String.join("|", "Welcome",null,"home"));
System.out.println(String.join("@", "userid","example.com"));

Output

Welcome|To|plus2net
07/02/2020
Welcome|null|home
userid@example.com

The first line simply joins three strings by using a delimiter.
The second line joins date, month and year parts by using / as delimiter.
The third line uses null as one of the string input and the same is used in final output.
In the last line one email address is created by using userid and domain name parts.

All String functions

replace() trim() startsWith() getChars() Java - Tutorials

string.join()

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