What can i do with this error “java.io.NotSerializableException”?

[nick86]

i am working on a java project and i want in the begging of the programme to load the things from the file and then add some things... I am getting this error

"java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException:      pcshop.Pc 
 
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at java.util.ArrayList.readObject(ArrayList.java:733)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at pcshop.PcShop.loadPcFiles(PcShop.java:48)
at pcshop.PcShop.main(PcShop.java:212)
  Caused by: java.io.NotSerializableException: pcshop.Pc
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at java.util.ArrayList.writeObject(ArrayList.java:710)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at pcshop.PcShop.main(PcShop.java:255)"

I am gonna give you some code..

//add the elements to an array list
public static void Insert()
{ 
                         Pc pc1=new Pc();
                         System.out.println("Price: \n");
                         n=in.nextFloat();
                         pc1.setPrice(n);
                         System.out.println("Quantity: \n");
                         m=in.nextInt();
                         pc1.setQuantity(m);
                         pcList.add(pc1);//pcList is an array list of Pc class
 }
 //load the file
  public static void loadPcFiles()
{
  try{
 
 
  FileInputStream input1=new FileInputStream("Users.txt");
 
  ObjectInputStream ob1=new ObjectInputStream(input1);
  //pcList is an array list of PC
  pcList =( ArrayList<Pc>) ob1.readObject();
 
 
  ob1.close();
 
  input1.close();
 
  } catch (ClassNotFoundException e) {
          e.printStackTrace();
  } catch(FileNotFoundException e) {
           e.printStackTrace();
   } catch (IOException e) {
  e.printStackTrace();}
 }
 
//print the lements from the arraylist
private static void PrintProducts ()
{
System.out.println("---------------------");
System.out.println("|  pc              :  |\n");
System.out.println("---------------------");
   for(Pc A: pcList)
   {
 
       A.printPc();
   }
 }
 
//PC class
public class Pc  extends Products implements Serializable {
 
 private String type;
 private float frequency;
 
 public Pc() {}
 
public Pc(String type, float frequency) {
    this.type = type;
    this.frequency = frequency;
}
 //and the products class
 public class Products implements Serializable{
 
private float price;
private int quantity;
private int id;
private String description;
 
public Products(){}
 
public String getDescription() {
    return description;
}
 
public void setDescription(String description) {
    this.description = description;
}
 
public float getPrice() {
    return price;
}
 
public void setPrice(float price) {
    this.price = price;
}
 
public int getQuantity() {
    return quantity;
}
 
public void setQuantity(int quantity) {
    this.quantity = quantity;
}
 
public int getId() {
    return id;
}
 
public void setId(int id) {
    this.id = id;
}
 
 @Override
 public String toString() {
     return "Products{" + "price=" + price + ", quantity=" + quantity + ", id=" + id +        ", description=" + description + '}';
}
 
 
 
}
 
 
public float getFrequency() {
    return frequency;
}
 
public void setFrequency(float frequency) {
    this.frequency = frequency;
}
 
public String getType() {
    return type;
}
 
public void setType(String type) {
    this.type = type;
}
 
 public void printPc()
 {
  System.out.println("Price: "+getPrice()+"Quantity"+getQuantity());
 
  System.out.println("---------------------");
 }
 
 @Override
public String toString() {
    return "Pc{" + "type=" + type + ", frequency=" + frequency + '}';
 }
} 

Why do i get an NotSerializable error even though my classes are serializabled??Does anyone now?

[firexfighterx]

Have you tried running in debug mode to see where the break occurs?