Java: Repeat (Understanding the code) -

could please explain how return line works? thank

public class javaapplication1 {         /**          * repeat string <b>str</b> <b>times</b> time.          * @param str string repeat          * @param times repeat str times time          * @return generated string          */         public static string repeat(string str, int times) {             return new string(new char[times]).replace("\0", str);         }         public static void main(string[] args) {             system.out.println(repeat("*", 5));         }      } 

it easier follow if broken down step step

// str = "*" , times = 5 public static string repeat(string str, int times) {   //we crete new empty array have values {'\0','\0','\0','\0','\0'}   char[] chararray = new char[times]();    string newstr = new string(chararray); // newstr.equals("\0\0\0\0\0")   newstr = newstr.replace('\0', str); //we replace '\0' "*"   return newstr; //newstr.equals("*****") }