java string join

1String a = "Hello";
2String b = " World";
3String c = a+b;

1String.join(" - ", "This", "course", "is", "awesome");
2// ou
3String.join(" - ", new String[]{"This","course","is","awesome"});
4				// retourne "This - course - is - awesome"
5
6String.valueOf(22); // retourne "22"
7

1String.join(" - ", "This", "course", "is", "awesome");
2
3String.valueOf(22); // retourne "22"
4