public class Test implements Savable<Test>{

    public String name;
    public int count;
    public float x, y;

    public Test(){
        //Empty constructor for loading
    }

    public Test(String name, int count, float x, float y){
        this.name = name;
        this.count = count;
        this.x = x;
        this.y = y;
    }

    public void save(DataOutputStream out) throws IOException{
        out.writeUTF(name);
        out.writeInt(count);
        out.writeFloat(x);
        out.writeFloat(y);
    }

    public Test load(DataInputStream in) throws IOException{
        name = in.readUTF();
        count = in.readInt();
        x = in.readFloat();
        y = in.readFloat();
        return this;
    }
}

public class Main{

    public static void main(String[] args){
        try {
            DataOutputStream out = new DataOutputStream(new FileOutputStream("test.dat"));
            Test test = new Test("fred", 99, 4.5f, 75.33f);
            test.save(out);
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            DataInputStream in = new DataInputStream(new FileInputStream("test.dat"));
            Test loadedTest = new Test().load(in);
            in.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}