How do I create a console application which manipulates text in system.out?

For example, instead of printing

/  
-  
\  
/  

on a new line make it so it stays on开发者_运维百科 one line and is an animation of a spinner?

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Yes, print a \b (backspace) to remove the last character. In a nutshell:

System.out.print('/');
System.out.print('\b');
System.out.print('-');
System.out.print('\b');
System.out.print('\\');
System.out.print('\b');

Note that this doesn't work in Eclipse console due to a bug. In the command console, however, it should work fine.

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If you need text cursor positioning, the solution will need to be through JNI. You will need some C cursor positioning software, which will be non portable. Curses was a popular application some 15-20 years ago.
The question is do you really need this trip to the past?

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Perhaps you should implement a command-line interface within your app. Then you could take complete control of the command-line's behavior. Libraries such as Clamshell-Cli may do the heavy lifting for you.

---

import java.io.*;
class Load_Animate
{
    static byte anime;
    static void animate(int i)
    {
        try
        {
            for(int j = 0 ; j<=100 ; j++)
            {
                switch(anime)
                {
                    case 1:
                        System.out.print("\r[ \\ ] :" + j + "%");
                        break;
                    case 2:
                        System.out.print("\r[ | ] :" + j + "%");
                        break;
                    case 3:
                        System.out.print("\r[ / ] :" + j + "%");
                        break;
                    default:
                        anime = 0;
                        System.out.print("\r[ - ] :" + j + "%");
                }
                anime++;
                Thread.sleep(i);
            }
        }
        catch(InterruptedException e)
        {
            System.out.println(e);
        }
    }
    public static void main(String args[]) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int i = Integer.parseInt(br.readLine());
        animate(i);
    }
}

Here is what I did I used "\r" which is a carriage return, basically pointing back to the first position in the line.