java：下面我已经编写了一个代码，如果用户输入escape键，那么循环必须终止..但是它对escape键不起作用
代码

import java.util.Scanner;

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

     Scanner scan = new Scanner(System.in);

     char ch=' ';

     while (ch!=27){  // 27 is ASCII code For 'Escape' Key.

         System.out.println("Input Any Character ");
          ch =scan.next().charAt(0);

     }
     System.out.println("End of Loop");

 }
}