Java.util.Scanner.hasNextDouble() 方法

package com.codingdict;

import java.util.*;

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

      String s = "Hello World! 3 + 3.0 = 6 ";
      Double d = 1.3985;
      s = s + d;

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

      // assign locale as US to recognize double numbers in a string
      scanner.useLocale(Locale.US);

      while (scanner.hasNext()) {

         // check if the scanner's next token is a double
         System.out.println("" + scanner.hasNextDouble());

         // print what is scanned
         System.out.println("" + scanner.next());
      }

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