How to list source code file names at Java run time ?

Question

When my program starts to run, how do I list available java source file names ? For example, I have a few dozen source files named "My_App_*.java" in my src directory, after I start my app, how can I call Java to list source files start with "My_App_" dynamically ?

Frank

Answer 1

Use java.io.File.list and its related methods. You can either get a String[] of filenames, or File[]. You can provide a FilenameFilter or a FileFilter, or you can filter the returned array afterward.

Answer 2

new File(".").list(new FilenameFilter()
{
  public boolean accept(File dir, String name)
  {
    return name.startsWith("My_App_") && name.endsWith(".java");
  }
});

Replace . with the directory where the files are.

But why do you need to do that?

Answer 3

If you know where the source directory is:

File srcFolder = new File("./src");
String[] files = srcFolder.list();
for(String file : files){
    if(file.startsWith("My_App_")){
        System.out.println(file);
    }
}