Please explain how you got the output

10. What is the output of the following program? public class Problem2\{ public static void main(String [] args) \{ String str1 = "Hello"; String str2 = "York students"; s1 = nosense (s1,s2); println 1(s1+"+s2); \} private string nosense(String s1, String s2) \{ String result = s 2. substring (s2. length ()5); s2 = " + s 2 . charAt (s1. length ()); s1 1 s 1 substring(2); result +=s2+ s 1; return result; \}