java please with comments (input and output)

Assignment \#12c - An Even Less Basic String Program Using the string methods that we have learned so far, write a program that will allow the user to type in line of text until the user types in the phrase "The end" on a line by itself. The program will replace every occurrence of "is" with the string "was' and count the number of changes made. Strings have two basic methods that you will need for this assignment: - s.indexOf(t) - which returns the position where substring t appears in si if t does not appear in 5 , it retums - 1. - keyb.nextLine0 - which reads in an entire line of text as a string - s.concat(t) - which returns a stting consisting of the strings s and t concatenated (orjoined) together. - s.substring (i,j) - which retums a substring of s beginning at character i and ending at character j1. - s.substring(i) - which returns a substring of s beginning at character i and ending at the end ofs