Write a console program that requests that the user enter a string. Using only S

Question

Write a console program that requests that the user enter a string.  Using only String's length and indexOf methods, print, in ascending order, the locations of each 'w', and 't'. When an input has been fully processed, request the user to enter another string. When the user enters -1, terminate the program. Use a Scanner and nextLine to read the user input.

For example, assume the user enters

wake tech is wonderful

the program prints

'w' or 't' are at locations 0, 5, 13

the user enters

Java wouldn't be the same without it

the program prints

'w' or 't' are at locations 5, 12, 17, 26, 28, 32, 35

the user enters

-1

the program prints

bye

Name the class and java file GimmeW.

Explanation / Answer

GimmeW.java:
import java.util.Scanner;
public class GimmeW {
   public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       while(true){ //repet until user enters -1
           System.out.println("Please enter a string");
           String string=sc.nextLine();
           if(string.equals("-1")){ //check if user entered -1
               System.out.println("bye");
               break;
           }
           int startSearchingFromPos=-1;
           //Only the string after 'startSearchingFromPos' index will be searched
          
           System.out.print("'w' or 't' are at locations ");
           int loopCount=0;
          
           while(true){
               loopCount++;
               int indexW=string.indexOf('w',startSearchingFromPos+1);
               int indexT=string.indexOf('t',startSearchingFromPos+1);
               if(indexW==-1 && indexT==-1){ //No more 'w' or 't' found
                   startSearchingFromPos=-1;
                   break;
               }
               else if(indexW==-1)
                   startSearchingFromPos=indexT;  
               else if(indexT==-1)
                   startSearchingFromPos=indexW;  
               else if(indexW<indexT)
               //check which index comes first, w's index or t's index
                   startSearchingFromPos=indexW;
               else
                   startSearchingFromPos=indexT;
               if(loopCount>1)
                   System.out.print(", ");
               System.out.print(startSearchingFromPos);
           }
           System.out.println();
          
       }
   }
}

Sample run:
Please enter a string
wake tech is wonderful
'w' or 't' are at locations 0, 5, 13
Please enter a string
Java wouldn't be the same without it
'w' or 't' are at locations 5, 12, 17, 26, 28, 32, 35
Please enter a string
-1
bye

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