Stroring certain details in a file, But Could not delete the File.

Question

I am storing certain details using serialization. But when i decide to delete the File i am unable to delete the File. I am attaching a sample Code to understand my problem.
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class SerialDemo implements Serializable {
  public static void main(String[] args) {
    try {
        FileOutputStream f = new FileOutputStream("./test.proj");
        ObjectOutputStream s = new ObjectOutputStream(f);
        SerialDemo d = new SerialDemo(5);
        s.writeObject(d);
        s.flush();
        FileInputStream f = new FileInputStream("./test.proj");
        ObjectInputStream s = new ObjectInputStream(f);
        SerialDemo d = (SerialDemo) s.readObject();
        System.out.println(d.getIndex());
        s.close();
        f.close();
        System.out.println("SerialDemo.getVal() is: " + d.getVal());
      File file = new File("./test.proj");
      System.out.println(file.delete());
    } catch (Exception e) {
      e.printStackTrace();
  int test_val = 7; // value defaults to 7
  public SerialDemo() {
    super();
  public SerialDemo(int x) {
    super();
    test_val = x;
  public int getVal() {
    return test_val;
  private int idx = 2;
  public int getIndex() {
    return idx;
  static final long serialVersionUID = -4717603181820250815L;
}

Answer 1

Glad I could help. I recommend you look into using FindBugs, it will warn you of this kind of thing. Also change the way you open/close streams to:
YourStream stream = null;
try {
   stream = new YourStream();
   // read/write from
} finally {
  try {
     stream.close();
  } catch( IOException ioe ) {
      // Log the IOE. Or use the IOUtils.quiteClose from Commons IO.
}As otherwise you could leave the stream open, i.e. if the read() method throws an IOE.