字符串的split和join

#JavaScript
var str = "ruben";
var array = str.split('');
array.forEach(s => console.log(s));
str = array.join('');
console.log(str);

//java
String str = "ruben";
String[] array = str.split("");
for (String s : array) {
    System.out.println(s);
}
str = String.join("", array);
System.out.println(str);