The java string join() method returns a string joined with given delimiter. In string join method, delimiter is copied for each elements.
In case of null element, "null" is added. The join() method is included in java string since JDK 1.8.
There are two types of join() methods in java string.
The signature of intern method is given below:
public static String join(CharSequence delimiter, CharSequence... elements)
public static String join(CharSequence delimiter, Iterable extends CharSequence> elements)
delimiter : char value to be added with each element
element :char value to be attached with delimiter
joined string with delimiter
NullPointerException if element or delimiter is null.