a simple join at java

split_join.java

/* package whatever; // don't place package name! */

import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Set;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{

		char [] charArray = "Hello".toCharArray();
		Set<String> strings = new LinkedHashSet<>();
		for (char c : charArray) {
		   strings.add(String.valueOf(c));
		}
		
		String out = String.join("-", strings) ;
		System.out.println(out);
	};
}