help for writing to files in java

Hi I have created a class named 'Human' that each object of this class has a name and a type which can be student or instructor. I have created another class main which creates object of Human and assign type and name to th开发者_开发知识库e objects and add that objects into a linkedList. Now I want to write this linkedList into a file,but i dont know how. i must write both objects and their type into that linkedList. i have created following as the Main class but I have problem in the writing file parts. would you please guide me?

public class Testing {

    public static LinkedList<Human> link =new LinkedList<Human>();
    static FileOutputStream fop;
    public static void main(String args[])
    {
        File f=new File("textfile1.txt");
        try {
            fop=new FileOutputStream(f);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        Human hm = new Human();
        Human hum = new Human();
        hm.setName("Anna");
        hm.setType("Student");
        hum.setName("Elvis");
        hum.setType("Instructor");
        link.add(hm);
        link.add(hum);
        for (Human h : link) {
            fop.write(h.getType());
            fop.write(h);
        }


    }
}

Look at java.io.PrintStream

PrintStream p = new PrintStream(fop);
for (Human h : link) {
  p.println(h.getType());
  p.println(h);
}
p.close();

Assuming you have implemented a toString method for Human.

An easy and working solution for your problem would be creating a simple "CSV" file, this would be a readable representation of your Human objects and look like:

Anna;Student
Elvis;Instructor

You can achieve this with doing:

for (Human h : link) {
  String line = h.toString() + ";" + h.getType() + "\n";
  fop.write(line.getBytes());
}

If you want to write the Objects to a file, you need to use serialization. Make the Human object to implement Serializable interface and then refer how to write the object to an output stream using serialization.