Serialize And Deserialize To A File - Uninitialized Fields
Aug 27, 2014
My code's objective is to serialize and deserialize to a file. I'm in the process of revising the code to allow multiple serializations and deserializations, but for now the code's limited to one serialization and deserialization. I'm also debugging one error, before I debug several others. I've limited my debugging question by accessing the field of one deserialization.
This is the code on pastie: [Code] ....
How to display the code on coderanch? I don't understand how to use the code widget.
I can successfully serialize an object, but I cannot deserialize it and access its fields. If you execute the program, create a new file, add ONE FullTimeEmployee object to the file and then read its firstName field, you'll be returned null.
I'm certain I initialized the field by using a constructor. I'm also pretty sure that I correctly casted Object (if I'm not mistaken,the generic type for a deserialization) into FullTimeEmployee
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Feb 10, 2014
I am trying to serialize an array and deserialize, I believe the serialization is working but I have been able to read the file.I am getting this
run:
Before serialization
arrays_serialize2.Account@9931f5
arrays_serialize2.Account@19ee1ac
arrays_serialize2.Account@9931f5
arrays_serialize2.Account@19ee1ac
After serialization
null
BUILD SUCCESSFUL (total time: 0 seconds)
[code]....
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Mar 23, 2014
package SystemandDesign.BinaryTree;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.io.ObjectInputStream;
[Code] ....
So I am having trouble with trying to get the main method to work. The program is supposed to construct a BinaryTree, and deserialize a file that is used for the Tree.
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Feb 17, 2014
I want to convert an object to string and vice-versa without writing it to file as i want to pass that string to server.
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Dec 7, 2014
how to differ between fields that are not exists to fields that are null? because in my api when someone wants to delete a field he sends null instead of a value. and if he doesnt want to effect this feild he doesnt send it.
{
"a" : {"1","2"},
"b" : "hello"
}
{
"a" : null,
"b" : "hello"
}
{
"b" : "hello"
}
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Feb 12, 2015
I can't deserialize my object, program is exited with crash.
See attached file.
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May 16, 2013
I am basically a Dot net developer. now im working on one Android project. my requirement is,
1. I have to call a web service, that will return XML data as String.
2. I have to read that XML string data.
3. Store those xml data into class collection(Collection is C# word, i dont know how here calling)
#1 i have done, #2 & #3 is pending. I knew reading xml is using SAX parser but, i dont know how to read from String using SAX.? Then how to store those XML data into a collection object.?
i tried with this link [URL] .... but, its confusing bcos, I am writing code Activity class but, there explaing with some Void Main class.
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Mar 9, 2015
I am trying to send a JPanel object to the server. While doing so I get the error -
java.io.NotSerializableException: javax.swing.filechooser.WindowsFileSystemView
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
[code]....
How to fix this error?
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Jan 11, 2015
I am getting following exception.
Jan 11, 2015 10:08:23 PM org.apache.catalina.session.StandardSession writeObject
WARNING: Cannot serialize session attribute cart for session 2F9FF7A5ABC3620BD5B3BC0C4D46C558
java.io.NotSerializableException: org.apache.tomcat.jdbc.pool.DisposableConnectionFacade
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
[Code] .....
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May 13, 2014
In my application i'm using java.util.ResourceBundle class. This is not serialized. My application works perfectly in a single node. But if i moved it to clustered mode resource bundle object will not be replicated to other server becasue it's not serializable.
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Oct 6, 2014
I have written several simple data classes that I serialized manually by converting to text. At this point I need to serialize a more complex data structure. which will include lists of the simpler elements. Can serialize store and reconstitute this type of structure automatically or do I need to do this one manually as well? Consider the pseudocode below for a clarification of my question;
Java Code:
Class Hops{
String Name;
float Alpha Acid;
float Beta Acid;
};
Class Malt{
String Name;
float extract;
};
Class Recipie{
String Name;
CList HopList;
CList MaltList;
};
CList RecipieList; mh_sh_highlight_all('java');
I read the article on Serialization presented at tutorial point, but the example only showed a simple class, not lists of class members. What I want to do is serialize RecipieList, which consists of a CList of Recipies, which in turn consist of CLists of various ingredients.
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May 20, 2014
This is the link [URL] and it says One significant difference between classes and interfaces is that classes can have fields whereas interfaces cannot.How can this be possible?
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Oct 18, 2014
At the end of my main method, I want it to print out the input given that should have been stored in my sandwich class fields, but it didn't.
import java.util.*;
import java.lang.*;
public class SandwichBuilder {
public static void main(String[] args) {
Scanner inputDevice = new Scanner(System.in);
[Code] .....
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Nov 20, 2014
I am unsure of something. In the following class, which is read first; the static field or the main method?
class Test{
static int a = 3;
public static void main(String args []) {
//some code}
}
I put some code in Eclipse and have tried to look at the hierarchy. It would point to all static fields being initialized in order from top to bottom, including the main method.I had thought that the main method was always the first thing in a public class to be initialized, regardless of where in the code it resides. Am I reading the Eclipse hierarchy wrong? I find Eclipse very difficult, especially since I typically code in Textmate. I just want to see how my code is operated upon,
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Apr 17, 2014
If I define a class which contains a few static fields, and then have a few classes who inherit this class, then all these classes would have the static field as well. Now my question is the following: would all those sub classes (and the base class itself) share the same object, or would each class have one object for all it's instances?
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Jul 9, 2014
I have a simple class, called InputManager, which has methods that communicate with another class DatabaseManager which has access to Database which is actually object that contains information about actual database.
My JFrame has Navigation class (extends JPanel). There I put all needed JButtons, JLists and so on.. This class has instance of InputManager and when user interacts with GUI components inside of it, Navigation calls InputManager methods, it then analyses the call and calls needed methods on DeviceManager, which then sends queries to Database and etc.
The problem is, that at the beginning (when user runs a program), I want to get information (which is actually values for my GUI components ) from Database. It could, for example, create another DatabaseManager and connect to the Database to get information, but it is okay to have two objects?
I was also thinking about sending same DatabaseManager object through InputManager to Navigation, but it seems strange for me to have two objects, which can interact with each other in both directions(Class A has instance of Class B, and Class B has instance of Class A). Is there anything bad this can do?
Also what I noticed that it seems odd that GUI class would have to get information from database. (Logic in GUI class).
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Mar 17, 2014
I am trying to find a concise way to write the sort methods for my class. I am supposed to make a program that can sort objects by a number of fields: year, rank, artist and title.
I used an idea from this thread : java - Sorting a collection of objects - Stack Overflow
And I am trying to use the custom comparator for my sort methods. However for some reason, the sortingBy variable fails to recognize any of the enum types.
Whenever I try to set the sortingBy variable equal to one of them, for example:
Java Code:
private Order sortingBy = Year; mh_sh_highlight_all('java');
I get a "Year cannot be resolved to a variable" error.
What I want to be able to do is make it so every time a specific method is called, say, for example sortTitle(), sortingBy will change to Title, then the SongComparator will sort using the case Title.
Is it possible to do this? I can't figure out how to modify SongComparator's object variables that way.
Java Code:
import java.util.Comparator;
public class SongComparator implements Comparator<Song> {
public enum Order {Year, Rank, Artist, Title}
public Order sortingBy;
[Code] .....
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Apr 24, 2014
I have a button in which I need to do the following:
After I click it It reads the values given in a jtextfield1 and in the other jtextfields I need it to settext in them from the database I mean if I have for example id=1 when I click the button it goes to the database and find the id 1 then write the infos in the other textfields
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Nov 24, 2014
I am doing the sorting of multiple fields. This sorting requires to sort the emergency numbers first followed by queue time. However, the sorting is fail, which is the emergency numbers are sorted correctly only but not the queue time. I try to figure out the problem but unfortunately I cannot find where the problem is. Below are the codes for my assignment (Please take note that there is no need to check both ListInterface and LList class) :
public interface ListInterface<T> {
public boolean add(T newEntry);
public boolean add(int newPosition, T newEntry);
public T remove(int givenPosition);
public void clear();
[code]....
This is the attachment of the result that I ran earlier:
Capture.jpg
The first list is before sorting while the second list is after sorting.
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Jan 3, 2015
i need to seek all data in result set one by one.i excuted a query which i don't know the result of it...it could be have one result in result set or 10 result.i tested this code :
PHP Code:
Query = "select * from book"
while (Rs.next)) {
row.add(new Book(Rs.getString(i)));
//Book is a class
}
but didn't work. do we have any other way we seek the result set without rs.next() ???
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Feb 28, 2014
I have a web application. I want to generate the UI part(basically html/jsp pages) to be generated dynamically using drag and drop of elements.So is there is any way that I can:
1: Have drag and drop of elements in jsps?
2: How I can create and store back the form attributes dynamically?
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Jun 20, 2014
Here is my code for an inventory program. No matter what I do, I can't get the text fields to display in the program.
The Inventory Program Class
import java.awt.GridLayout; // required to create a grid layout
import java.awt.BorderLayout; // required to create a border layout
import java.awt.event.ActionEvent; // required for click events
[Code].....
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Jul 11, 2014
So I have an Enum file with 119 constants and each constant of that type has 20 fields that come with it. All the fields are the same type and named the same (e.g. there are 119 of Object obj, one for each constant), and I want to run the same methods over them. Since the Objects of the same type are named the same for each constant, I just have them named explicitly in get-er methods.
This worked fine when I just put all 20 fields through the constructor and set them as fields under all the constants. But I realized that if I wanted to make an instance of this Enum class, I'd have to enter in all 20 fields when they are all a set of Objects with unique values. So I then put them as fields under their own respective constant to make it easier to create instances of this enum. But now my methods don't work.
A) I don't really understand why they don't work anymore?
B) Is there a way to fix it without putting all the methods under each constant?
Example:
public enum MyEnum {
AAA {
private MyObject obj = new MyObject (3.0);
},
BBB {
private MyObject obj = new MyObject (1.5);
},
CCC {
private MyObject obj = new MyObject (6.5);
},
DDD {
private MyObject obj = new MyObject (3.5);
};
public double getObjVal() {
return obj.value(); // it can't find this obj should I move it up to where the constants are declared?
}
}
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Aug 24, 2014
What should be the code if i want to input a different string in case of the typed string. The case is : I have a predefined string S = "Peter,please answer my question" and now when i input another string inside the text field character by character i want characters from the string S to enter instead of the input string. In short, the input string should be disguised as string S.
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Apr 26, 2015
I have an assignment to write a Payroll class that uses the following arrays as fields:
-employeeID - An array of seven integers to hold employee identification numbers. The array should be initialized with the following numbers: 5658845 4520125 7895122 8777541 8451277 1302850 7580489
-hours - An array of seven integers to hold the number of hours worked by each employee
-payRate - An array of seven doubles to hold each employees hourly pay rate
-wages - An array of seven doubles to hold each employees gross wages
The class should relate the data in each array through the subscripts. For example, the number in element 0 of the hours array should be the number of hours worked by the employee whose identification number is stored in element 0 of the employeeID array. That same employee's pay rate should be stored in element 0 of the payRate array. In addition to the appropriate accessor and mutator methods, the class should have a method that accepts an employee's identification number as an argument and returns the gross pay for that employee. Demonstrate the class in a complete program that displays each employee number and asks the user to enter that employee's hours and pay rate. It should then display each employee's identification number and gross wages. Input Validation: Do not accept negative values for hours or numbers less than 6.00 for pay rate.
I'm off to a great start, however I'm stumped on how to pass the payrate for each employee into the array, then grab that data in order to calculate the gross wage for each employee and store THAT in its own array. THEN I'll have to output that data to each employee.
Code is shown below.
import java.util.Scanner;
import java.text.DecimalFormat;
public class PayrollProgram {
public static void main(String[] args) {
Scanner userInput = new Scanner(System.in);
DecimalFormat df = new DecimalFormat("0.00");
[code]....
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Jun 1, 2014
Which is considered clearer and better for naming?
class SpeedAnimation {
//rate to increment frames at 0 speed
public float baseIncrementRate;
//additional rate to increment frames at, scaled by the speed
public float speedIncrementMultiplier;
//current fractional frame index
public float currentFrameIndex;
//give the upper and lower index bounds to animate between
public int startingIndex;
public int endingIndex;
}
vs.
class SpeedAnimation {
//rate to increment frames at 0 speed
public float base;
//additional rate to increment frames at, scaled by the speed
public float multiplier;
//current fractional frame index
public float index;
//give the upper and lower index bounds to animate between
public int start;
public int end;
}
I've always been really elaborate with my names, because I thought that being more descriptive is more precise and lowers the chance that names might clash with each other, but then I noticed that a lot of my code becomes really lengthy and tiring to read, ie.:
float speed = body.getVelocity().len();
float positionIncrement = (baseIncrementRate + speedIncrementMultiplier * speed) * deltaTime;
currentFrameIndex += positionIncrement;
currentFrameIndex = currentFrameIndex % (startingIndex+endingIndex-1) + startingIndex;
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