Java 输入时间限制

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..." );    }}