java - Console output and file output seem to be different -

so doing program go through every folder in designated folder , if there files inside of thoes folder, read them.

the files this:

file name: grades  mait 5 5 5 kati 3 3 3 vello 4 4 4 

so read in each line , 0th element in every line name of student add array. after take grades , calculate median of them.

also files in folders named class name. instance math has every math grade in it.

now programs job read thoes files , produce output file contains every students name , median in every class , after median of grades.

this how output looks right now:

nimi: mait keskmine hinne: 5.0 aine: ..\text\students\english\grades nimi: kati keskmine hinne: 3.0 aine: ..\text\students\english\grades nimi: vello keskmine hinne: 4.0 aine: ..\text\students\english\grades nimi: mait keskmine hinne: 1.0 aine: ..\text\students\math\grades nimi: kati keskmine hinne: 2.0 aine: ..\text\students\math\grades 

it's not in english in form of name:, median; , class name;

now problem here that, when print same thing out console, instead of file this:

nimi: mait keskmine hinne: 5.0 aine: ..\text\students\english\grades nimi: kati keskmine hinne: 3.0 aine: ..\text\students\english\grades nimi: vello keskmine hinne: 4.0 aine: ..\text\students\english\grades nimi: mait keskmine hinne: 5.0 aine: ..\text\students\english\grades nimi: kati keskmine hinne: 3.0 aine: ..\text\students\english\grades nimi: vello keskmine hinne: 4.0 aine: ..\text\students\english\grades nimi: mait keskmine hinne: 1.0 aine: ..\text\students\math\grades nimi: kati keskmine hinne: 2.0 aine: ..\text\students\math\grades 

now can see, first file read, duplicated or reason. problem not occur when have 1 folder program can read from. more folders.

now why problem me? because cannot see how manage calculate median of grades 1 student has gotten in school, when have duplicate values in program.

what might issue here , how can solve it?

here classes in project guys see code:

main.java:

package files;  import java.io.bufferedreader; import java.io.filenotfoundexception; import java.io.filereader; import java.io.filewriter; import java.io.ioexception; import java.io.printwriter; import java.nio.file.files; import java.nio.file.path; import java.nio.file.paths; import java.util.arraylist; import java.util.list;  public class main {      public static void main(string[] args) throws filenotfoundexception {          path lessons = paths.get("../text/students");         filevisitor file = new filevisitor();         try {             files.walkfiletree(lessons, file);         } catch (ioexception e) {             e.printstacktrace();         }          list<path> files = file.askfiles();         list<student> students = new arraylist<>();          for(path adress:files){             //system.out.println(adress.getfilename());             try {                 bufferedreader textin = new bufferedreader(new filereader(adress.tostring()));                 string line;                 while((line = textin.readline()) != null){                     string[] readcontent = line.split(" ");                     student student = new student(readcontent[0],adress.tostring());                     //system.out.println("sad");                     for(int = 1;i < readcontent.length; i++){                         student.addgrade(readcontent[i]);                         //system.out.println(adress.getparent()+ " ");                     }                     students.add(student);                 }                 printwriter output = new printwriter(new filewriter("../text/opilased_out"));                 for(student i:students){                     output.println("nimi: "+i.askname() + " " + "keskmine hinne: "+i.askmedian() + " " + "aine: "+i.asksubject());                     system.out.println("nimi: "+i.askname() + " " + "keskmine hinne: "+i.askmedian() + " " + "aine: "+i.asksubject());                 }                 output.close();             } catch (ioexception e) {                 e.printstacktrace();                 }            }     } } 

student.java:

package files;  import java.util.arraylist; import java.util.list;  public class student {     string studentname;     list<integer> studentgrades = new arraylist<>();     string subjectname;     double sum;      public student(string name, string subject) {         subjectname = subject;         studentname = name;     }      public string asksubject(){         return subjectname;     }      public string askname(){         return studentname;     }       public void addgrade(string grade) {         studentgrades.add(integer.parseint(grade));         //system.out.println(studentgrades);         (int = 0;i < studentgrades.size(); i++){             //system.out.println(studentgrades.get(i));         }     }      public double askmedian() {         double median = 0;         (int = 0;i < studentgrades.size(); i++){             //system.out.println(studentgrades.get(i));             median += studentgrades.get(i);             sum = median/studentgrades.size();         }         //system.out.println(studentgrades);         //system.out.println(sum);         return sum;     } } 

filevisitor.java:

package files;  import java.io.ioexception; import java.nio.file.filevisitresult; import java.nio.file.path; import java.nio.file.simplefilevisitor; import java.nio.file.attribute.basicfileattributes; import java.util.arraylist; import java.util.list;  public class filevisitor extends simplefilevisitor<path> {      private list<path> adresses = new arraylist<>();      @override     public filevisitresult postvisitdirectory(path dir, ioexception exc)             throws ioexception {         return super.postvisitdirectory(dir, exc);     }      @override     public filevisitresult previsitdirectory(path dir, basicfileattributes attrs)             throws ioexception {         return super.previsitdirectory(dir, attrs);     }      @override     public filevisitresult visitfile(path file, basicfileattributes attrs)             throws ioexception {         adresses.add(file);         //system.out.println(file);         return super.visitfile(file, attrs);     }      @override     public filevisitresult visitfilefailed(path file, ioexception exc)             throws ioexception {         return super.visitfilefailed(file, exc);     }      public list<path> askfiles(){         return adresses;     } } 

any appreciated! have been trying figure out problem days now...