Question

I was adding a loading bar feature to my program in Java and I was wondering if I could set a list of processes that need to be done, so that it knows how many processes it needs to complete.

For example, saving them as strings?

ArrayList<String> processes = new ArrayList<String>();
processes.add("CSVWriter.createFileOfCompany(\"Random Company\");");
processes.add("FileConverter.convertCSVToXLS(classPath + 
    \"/Output/Random_Company.csv\");");

for (int i = 0; i < processes.size(); i++) {
    // run process
    // update loading bar
}

These aren’t real methods to my program, but they are pretty similar to what I want to accomplish.

I’m sure this isn’t the best way, but I want to have some way to create a list like this so I know how many processes there are before I run them. I have a system set up to break down these processes even further and show their progress, so this bar is pretty precise at the moment, but I have to number each of the processes =/.

Maybe I’m just missing the point. Creating progress bars is totally new to me.

If there are any good articles on progress bar creation, feel free to send them my way as well. Keep in mind that I’m not using an actual swing-based GUI. This bar is all S.O.P text.

Many thanks,

Justian Meyer

Answer 1

Closures will hopefully be coming soon in the next version of Java, but until then you can use anonymous classes implementing a known interface:

List<Runnable> jobs = new ArrayList<Runnable>();

jobs.add(new Runnable() {
    public void run() {
        CSVWriter.createFileOfCompany("Random Company");
    }
});

jobs.add(new Runnable() {
    public void run() {
        FileConverter.convertCSVToXLS(classPath + "/Output/Random_Company.csv");
    }
});

for (Runnable job : jobs) {
    job.run();
}