Reputation:

I can't serialize and deserialize an object in Java

I have a problem while serializing an object in Java(8). I saw many examples, but none of them work for me. The thing is that while serializing it doesn't serialize the object with its complete data. When I try to deserialize, it reads all the variables as null. I do this with Employee class. The code for Serialize.java :

public class Serialize {
private static ArrayList<Employee> emp = new ArrayList<Employee>();
public static void main(String[] args){
    try{

            emp.add(new Employee("Areg Hovhannisyan",5));
            emp.add(new Employee("Tigran Hakobyan",15));
            emp.add(new Employee("Shivanshu Ojha",11));
            FileOutputStream fos = new FileOutputStream("emps.emp");
            ObjectOutputStream out = new ObjectOutputStream(fos);
            out.writeObject(emp);

            out.close();
            fos.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
}
}

Employee.java:

import java.io.Serializable;
public class Employee implements Serializable {
private static int age;
private static String name;

public static int getAge() {
    return age;
}
public static void setAge(int age) {
    Employee.age = age;
}
public static String getName() {
    return name;
}
public static void setName(String name) {
    Employee.name = name;
}


public Employee(String name,int i) {
    this.name = name;
    this.age = i;
}
@Override
public String toString() {
    return "Name : " + getName() + ", Age : " + getAge();
}

}

Please give an example to do this,how to deserialize and please give it with a explanation because I also want to understand how it works.

Upvotes: 3

Answers (4)

Rajesh

Reputation: 384

As mentioned in the above comments, Statics are implicitly transient. Also as per your code if the variables are static, you'll have one vaule(which is finally added) in your Arraylist. This is the behaviour of static variable.

Please give an example to do this,how to deserialize

Code with Deserialization:

public static void main(String[] args) throws IOException,
        ClassNotFoundException {
    FileOutputStream fos = null;
    ObjectOutputStream out = null;
    FileInputStream fis = null;
    ObjectInputStream in = null;
    try {

        emp.add(new Employee("Areg Hovhannisyan", 5));
        emp.add(new Employee("Tigran Hakobyan", 15));
        emp.add(new Employee("Shivanshu Ojha", 11));
        fos = new FileOutputStream("emps.emp");
        out = new ObjectOutputStream(fos);
        out.writeObject(emp);

        fis = new FileInputStream("emps.emp");
        in = new ObjectInputStream(fis);
        ArrayList<Employee> empRead = (ArrayList) in.readObject();
        System.out.println(empRead.get(0));
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        out.close();
        fos.close();
    }
}

Upvotes: 0