java cli running indicator

I want some ascii characters periodically changing to 开发者_开发问答indicate my CLI program is running, like -|\/-|/.... The old character is replaced by the new, which looks like an animation. Is there any library approaching that?

Kejia

You might want to use the carriage return(CR) character ('\r' in java) to do this. I would do it this way (assuming you are doing the animation at the beginning of the row):

My solution (Test.java):

public class Test
{
    public static void main(String[] args)
    {
        try
        {
            System.out.print("\\");
            Thread.sleep(1000);
            System.out.print("\r|");
            Thread.sleep(1000);
            System.out.print("\r/");
        }catch(Exception e)
        {
        }
    }
}

Simplest idea: try replace all console (rows & cols) with new view (frame) of your animation.

I once wrote a test program and part of it worked like curl/wget to download a file. To print the progress I just used System.err.print(n); System.err.print('\r'); which moves the cursor to the start of the line ready for the next progress update. But in your case you could probably print each one of "\\\b" "-\b" "/\b" (\b is backspace) in order repetitively to get the spinning effect.

In Scala:

"-|\\/-|/".toCharArray ().foreach {c =>  print ("\b" + c); Thread.sleep (250); }

Analog, but more Code in Java, but not tested:

for (c : "-|\\/-|/".toCharArray ()) 
{
    System.out.print ("\b" + c); 
    Thread.sleep (250); 
}