I do not have much knowledge of Java, I would like to separate the strings from my List, with ",".
List<String> nomes = Arrays.asList("Paulo", "Ana", "Zeno", "Beno");
for(int i=0; i<nomes.size(); i++) {
System.out.format("%s%s", nomes.get(i),
i != nomes.size() - 1 ? ", " : " ");
}
But I did not find a good solution, I also tried with foreach of Java 8, but I could not.
You do not need any loopback, the String class itself has a method called join that converts a list to string , using another string as a separator .
List<String> nomes = Arrays.asList("Paulo", "Ana", "Zeno", "Beno");
String todosNomes = String.join(", ", nomes);
If you do System.out.println(todosNomes) , you will have: Paulo, Ana, Zeno, Beno .
See working at Ideone .
If it's just to display on the screen, you do not need to use any kind of special command, just display it by default java text output:
System.out.println(nomes);
Output:
[Paul, Ana, Zeno, Beno]
This is the default view of the ArrayList, defined by its toString() method, as seen below (taken from grepcode )
public String toString() {
Iterator<E> i = iterator();
if (! i.hasNext())
return "[]";
StringBuilder sb = new StringBuilder();
sb.append('[');
for (;;) {
E e = i.next();
sb.append(e == this ? "(this Collection)" : e);
if (! i.hasNext())
return sb.append(']').toString();
sb.append(", ");
}
}
}
Running on ideone.com/f0yjBL