Thread: BufferedWriter Problem

Hi,

i want to make mini-school project and so i create 3 class(School,Student and Run) i want to write students name out.txt with using bufferedwriter but i can't do it.

School Class Code;

import java.util.*;
public class School {
    private int schoolId;
    private String schoolName;
    public int getSchoolId() {
        return schoolId;
    }
    public School(int schoolId, String schoolName) {
        super();
        this.schoolId = schoolId;
        this.schoolName = schoolName;
 
    }
    public void setSchoolId(int schoolId) {
        this.schoolId = schoolId;
    }
    public String getSchoolName() {
        return schoolName;
    }
    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }
    public List<Student> getStudents() {
        return students;
    }
    public void setStudents(List<Student> students) {
        this.students = students;
    }
    public List<Student> students;
}

Student Class Code;

public class Student {
    private int studentId;
    private String studentName;
    public int getStudentId() {
        return studentId;
    }
    public Student(int studentId, String studentName) {
        super();
        this.studentId = studentId;
        this.studentName = studentName;
 
    }
    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }
    public String getStudentName() {
        return studentName;
    }
    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }
    public School getSchool() {
        return school;
    }
    public void setSchool(School school) {
        this.school = school;
    }
    private School school;
}

and Run Class Code;

public static void main(String[] args) {
        // TODO Auto-generated method stub
        School sc = new School(1, "Berkeley");
        sc.setStudents(new ArrayList<Student>());
        Student st1 = new Student(1,"Bill Gates");
        st1.setSchool(sc);
        sc.getStudents().add(st1);
 
        Student st2 = new Student(2,"Steve Jobs");
        st2.setSchool(sc);
        sc.getStudents().add(st2);
 
        Student st3 = new Student(3,"Larry Page");
        st3.setSchool(sc);
        sc.getStudents().add(st3);
 
 
 
        try {
            String file="d:\\okul\\out.txt";
                FileWriter fw = new FileWriter(file,true);
                BufferedWriter bw = new BufferedWriter(fw);
                List<Student> t=sc.getStudents();
                bw.write(t);
                bw.close();
        }catch(Exception e){
             e.printStackTrace();
         }
 
 
    }
 
}

but line of "bw.write(t)" said problem.

"The method write(int) in the type BufferedWriter is not applicable for the arguments (List<Student>)"

how can i correnting this problem ?

thanx.

I think you should have to change your data into string first and then place in the file.

t.toString();

thank you Mr.777, i search Serialization method.i write this code

String fileName="D:\\okul\\out.txt";
		FileOutputStream fos=new FileOutputStream(fileName);
		ObjectOutputStream oos=new ObjectOutputStream(fos);
		List<Student> t=new sc.getStudents();
		oos.writeObject(t);
		oos.close();

but line of "List<Student> t=new sc.getStudents();" said this problem "sc cannot be resolved type". please help

Definitely, what is sc by the way?