Loop io & control

Question

Hello, everyone. I was trying to create an infinity loop, and as the loop running, it prints out how many loops it has been through on the command window, and to stop the loop, user can just put a command on the command line then press enter. To do that, I created the following code:
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
int command = 0;
int count = 0;
while(true&&command==1)
count++;
System.out.println(count);
command = input.read();
The code looks fine, but it doesn't actually work at all, becuase once the system is in the loop and reach to input.read() for the first time, the system will haut, and waiting for user's input instead of carry on running, if I input any thing in, it will just run just one loop and asking input again instead of keeping running without interruption. And even if I solved the problem, System.out.println(count) will print out figure line by line instead of updating the figure just on the one same line. So, could anybody tell me how could I stop an infinity loop by a friendly user input instead of ctrl-c, and how could I constantly update the figure on the one same line instead of printing line by line??? Thank you very much for the help.

Answer 1

that requires more control over the console window than java allows, i think
in theory, you will need one thread to wait for input, one thread to update the
count area, it may be possible to trick windows into only updating the current
line by doing:System.out.print("Count: " + count + "\r"); Note the "\r", it forces a carriage return but not
a newline.
here is a silly bit of code that may help:class ConsoleTest {
     public static void main(String[] args) throws Throwable {
          new Thread( new GetInput() ).start();
          System.out.println("Stop?: ");
          for(int k = 0; k < 100; k++){
               System.out.print("Count: " + k + "\r");
               Thread.sleep(100);
          System.out.println("\r\n");
     public static class GetInput implements Runnable {
          public void run(){
               while(true){
                    try {
                         int k = System.in.read();
                         if(k == 'a'){
                              System.exit(1);
                    } catch(Exception e){}
}