how does hasnext work java code example

Example: hasnext in java

import java.util.*;
import java.util.regex.Pattern;

public class ScannerDemo {
   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6";

      // create a new scanner with the specified String Object
      Scanner scanner = new Scanner(s);

      // check if the scanner has a token
      System.out.println("" + scanner.hasNext());

      // print the rest of the string
      System.out.println("" + scanner.nextLine());

      // check if the scanner has a token after printing the line
      System.out.println("" + scanner.hasNext());

      // close the scanner
      scanner.close();
   }
}