关闭扫描程序而不关闭System.in，以便其他方法可以访问System.in

Question

我有以下程序可以正常运行。与尝试执行相同操作的其他静态方法结合使用时会出现问题。在某些ide（BlueJ）上它可以正常工作，但在其他（eclipse）上则不能。

当它不起作用时，它将挂在input = kboard.nextLine();

上

我认为日食可能是一个更强大的想法。无论如何，如何在不关闭System.in的情况下关闭kboard以便将来使用？

/**
 * Suppose you want to capture input from the keyboard
 * but don't know what the user will type in.  You could 
 * get text, or a number or you could just get [enter].
 * 
 * How can you capture the input?
 */

import java.util.Scanner;

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

       boolean text   = false,
               number = false,
               enter  = false;

       String input = "";

       Scanner kboard = new Scanner(System.in);

       while(!input.equals("**")){

           input = kboard.nextLine();

           Scanner kstring = new Scanner(input);

           /**
            * if length() of input = 0 we must have gotten  [enter]
            */

           /**
            * notice the order of the else if statements
            * what happens if you reverse them?
            */

           if(input.length() == 0)          enter  = true;
           else if(kstring.hasNextDouble()) number = true;
           else if(kstring.hasNext())       text   = true;



           System.out.println("[enter] : " + enter + "\n" +
                              "text    : " + text  + "\n" +
                              "number  : " + number);


           /** 
            * we close kstring before we create a new one
            */ 
           kstring.close(); 

           text   = false;
           number = false;
           enter  = false;

       }

       /**
        * we close kboard before we exit
        */

       kboard.close();



   }

}