String.join(" - ", "This", "course", "is", "awesome"); // ou String.join(" - ", new String[]{"This","course","is","awesome"}); // retourne "This - course - is - awesome" String.valueOf(22); // retourne "22"
String a = "Hello"; String b = " World"; String c = a+b;
String.join(" - ", "This", "course", "is", "awesome"); String.valueOf(22); // retourne "22"