import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.*;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

@XmlRootElement(name = "xml")
public class TestProject {

private int numberOfFiles;

@XmlElementWrapper(name = "filesystem")
@XmlElement(name="file")
private List<FileInformation> lstFileNames;

private int numberOfLibDirs;
private List<String> lstLibDirs;

@XmlElement(name = "Compilation")
private Compilation compilation;

private int numberIncludeDirs;
private List<String> lstIncludeDirs;

private String optLevel;

private String langVersion;

private String compilerType;

@XmlElement
private TestSet testSet;

private boolean isDebug;

public TestProject(){

   String FILE_DIR = "files";

   lstFileNames = new ArrayList<>();
   lstLibDirs = new ArrayList<>();
   lstIncludeDirs = new ArrayList<>();

   lstLibDirs.add("./lib");
   lstLibDirs.add("./GL");
   lstLibDirs.add("./special/secret/library");

   lstIncludeDirs.add("./include");
   lstIncludeDirs.add("/include/phigs");

   isDebug = true;
   langVersion = "17";
   compilerType = "C++";

   try {
         File file = new File(FILE_DIR);
         if(file != null && file.isDirectory()){
            File[] files = file.listFiles();
            for (File f: files) {

               if(f != null && f.isFile() && f.getName().endsWith(".txt")) {
                     BufferedReader bufferedInputStream = new BufferedReader(new FileReader(f));

                     String content = "";
                     String line = "";

                     while ((line = bufferedInputStream.readLine()) != null) {
                        line = line.replaceAll("&", "&");
                        line = line.replaceAll("<", "<");
                        line = line.replaceAll(">", ">");
                        content += line + "\n";
                     }
                     lstFileNames.add(new FileInformation(f.getName(), content));
                     bufferedInputStream.close();
               }
            }
         }
   }catch (Exception ex){
         System.err.println(ex.getMessage());
   }

In this assignment, you will implement a countdown tree, in the fil...