Java Object input stream readObject();

Question

I have saved an object to an array list and saved the file as .dat, but when I want to read the object it is just showing null and not the values.

The Class

public class Person implements Serializable {
  public static String Name;
  public static String Contact;

  public Person(String Name, String Contact) {
    this.Name = Name;
    this.Contact = Contact;
  }

  public String getName() {
    return Name;
  }

  public String getContact() {
    return Contact;
  }
}

The code

FileInputStream fis;
try {
  fis = new FileInputStream("Person.dat");
  ObjectInputStream ois = new ObjectInputStream(fis);
  ArrayList<Person> per = (ArrayList<Person>) ois.readObject();
  ois.close();

  per.get(0);
  Person pe = per.get(0);
  System.out.println(pe.getName());
} catch (FileNotFoundException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
} catch (IOException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
} catch (ClassNotFoundException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
}

wero · Accepted Answer · 2016-04-05 14:45:27Z

5

You defined static members Name and Contact which are not serialized. Remove the static modifier to make this work.

answered Apr 5, 2016 at 14:45

wero

33.1k3 gold badges63 silver badges87 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

bcsb1001 Over a year ago

Also, naming conventions should be followed (name and contact).

Ravindra babu · Accepted Answer · 2016-04-05 15:05:28Z

0

Only non-transient and non-static fields will be serialized.

Refer to oracle documentation page and jusfortechies article.

Change

public static String Name;
public static String Contact;

to

public String Name;
public String Contact;

answered Apr 5, 2016 at 15:05

Ravindra babu

39.1k11 gold badges258 silver badges222 bronze badges

Collectives™ on Stack Overflow

Java Object input stream readObject();

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related