输入的时间限制 [英] Time limit for an input

问题描述

假设我有一个代码，它要求用户提供一些输入，如下所示:

Suppose I have a code where it asks the user to give some input, something like this:

for (condition) {
System.out.println("Please give some input");
System.in.read();
} //lets say this loop repeats 3 times and i face a problem during second iteration

但我想给用户 60 秒的时间限制，然后抛出异常(在这种情况下，我认为是 TimeOutException).我该怎么做?

but I want to give the user a 60 second time limit, and then throw an exception (in this case, I think its TimeOutException). How do I do that?

推荐答案

import java.util.Timer;
import java.util.TimerTask;
import java.io.*;
public class test
{
    private String str = "";

    TimerTask task = new TimerTask()
    {
        public void run()
        {
            if( str.equals("") )
            {
                System.out.println( "you input nothing. exit..." );
                System.exit( 0 );
            }
        }    
    };

    public void getInput() throws Exception
    {
        Timer timer = new Timer();
        timer.schedule( task, 10*1000 );

        System.out.println( "Input a string within 10 seconds: " );
        BufferedReader in = new BufferedReader(
        new InputStreamReader( System.in ) );
        str = in.readLine();

        timer.cancel();
        System.out.println( "you have entered: "+ str ); 
    }

    public static void main( String[] args )
    {
        try
        {
            (new test()).getInput();
        }
        catch( Exception e )
        {
            System.out.println( e );
        }
        System.out.println( "main exit..." );
    }
}

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