How to create CommandLine in Java (Console)

Question

I code a little java programm. Every second I print a value in the console

System.out.println("Test");

I write a command in the moment, if the System.out. loop starts, my command just disappear and goes up with the System.out.println("").

This is my Code:

public class Main{  
public static String s;
public static void main(String[] args) {

    printLogo();

    Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        public void run() {

            Data.cpuUsage = ((OperatingSystemMXBean) ManagementFactory
                                                 .getOperatingSystemMXBean())
                                                 .getSystemCpuLoad() * 100;
            Data.totalMem = ((OperatingSystemMXBean) ManagementFactory
                                                 .getOperatingSystemMXBean())
                                                 .getFreePhysicalMemorySize() / 1000000;

            System.out.println(Data.totalMemory);
        }
    }, 1000, 1000);

    System.out.println("Please type a command:");

Maybe someone can help me? Sorry for my bad English.

Your main method is terminating and hence the timer is being killed. Look into using `ScheduledThreadExecutor`. — Tim Biegeleisen, Jul 17 '17 at 12:05
Check here: https://stackoverflow.com/questions/1321620/waiting-for-a-timer-to-finish-in-java — Tim Biegeleisen, Jul 17 '17 at 12:12
A quick and dirty fix would be to add something like `Thread.sleep(100000)` to the end of your `main()` method. — Tim Biegeleisen, Jul 17 '17 at 12:13

score 0 · Answer 1 · answered Jul 17 '17 at 12:09

Your issue is that you're printing every second. Whenever the use types something, it'll just be concatenated to the last line printed. If you want to have some form of UI within a terminal, you're going to have to use some type of library (or at least not just System.out.* functions).

Check out Charva.

How to create CommandLine in Java (Console)

1 Answers1