Java定时器timer 字符与数字计算的时候，自动转换成数字

TimerTest.java

package timer;

import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

/**
 * Created by IntelliJ IDEA.
 * User: Hoodoo
 * Date: 11-4-26
 * Time: 下午2:21
 * To change this template use File | Settings | File Templates.
 */
public class TimerTest {

    public static void main(String[] args) {
        Timer timer = new Timer();
        timer.schedule(new MyTask(), 1000, 2000);
        while (true) {
            try {
                int ch = System.in.read();
                if (ch - 'c' == 0) {
                    if (timer != null) {
                        timer.cancel();
                        timer = null;
                        System.out.println("定时任务已经取消");
                    } else
                        System.out.println("任务已经取消了，不能再次取消；要启动请按'r'");

                }
                if (ch - 'r' == 0) {
                    if (timer == null) {
                        System.out.println("定时任务再次启动");
                        timer = new Timer();
                        timer.schedule(new MyTask(), 1000, 2000);
                    } else
                        System.out.println("定时任务已经启动了，不需要再次启动;要取消请按'c'");

                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}


class MyTask extends TimerTask {
    public void run() {
        System.out.println("*******************************@@@@@@@@*********************************");
    }

}