Question

I ran into an issue. Below is my code, which asks user for input and prints out what the user inputs one word at a time.

The problem is that the program never ends, and from my limited understanding, it seem to get stuck inside the while loop. Could anyone help me a little?

import java.util.Scanner;

public class Test{
   public static void main(String args[]){
      System.out.print("Enter your sentence: ");
      Scanner sc = new Scanner (System.in);
     
      while (sc.hasNext() == true ) {
        String s1 = sc.next();
        System.out.println(s1);
      }

      System.out.println("The loop has been ended"); // This somehow never get printed.
   }
}

Answer 1

You keep on getting new a new string and continue the loop if it’s not empty. Simply insert a control in the loop for an exit string.

while(!s1.equals("exit") && sc.hasNext()) {
    // operate
}

If you want to declare the string inside the loop and not to do the operations in the loop body if the string is “exit”:

while(sc.hasNext()) {
    String s1 = sc.next();
    if(s1.equals("exit")) {
        break;
    }
    //operate
}