Serializing And Deserializing Multiple Object In Java
Dec 10, 2014
My application needs to accept multiple input at different time and i need to serialize it whenever it gets the new input and after that i need to Deserialize the object one by one.how it can be implemented. Eachtime i am able to deserialize only one object that came at last. How to implement this functionality..
This is the code for serializing.
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Scanner;
public class Dummyserial implements Serializable {
[Code] ....
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Feb 10, 2014
I need to serialize an array, I have a class Account I believe the serialize part is working I created a file
("testArray.data");
But when I read the file and try to dump it in an array I got this null
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)
public class Arrays_serialize2 {
private static Account[] accounts;
private static Object Accounts;
private static Iterable<Account> arr;
private static Object newAccount2;
[Code] ....
Here is the class Account
public class Account
{
private int accountNumber; // account number
private int pin; // PIN for authentication
private double availableBalance; // funds available for withdrawal
private double totalBalance; // funds available + pending deposits
[Code] ....
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Jul 13, 2014
I have this arraylist off a custom object that looks like this witch also contains a list off custom objects
package holders;
import java.util.ArrayList;
public class ManufacturingJobHolder {
private String name;
[code]....
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Jan 27, 2012
I have to be able to read files that have been serialized in VB. 2 things, 1 they are serialized in Binary, and I tried to look up on how to serialize/deserialize in Binary, but didn't have much support...
Also in the VB code they talk about "TYPES" which seems to be to just be a class full of stuff...
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Dec 27, 2014
I am reading Head First: Java and got to Object References. In the book I got a little bit confused on what happens when two object reference's point at the same object so I wrote a small crude test, the below code. This of course clarified what happens but what I am interested in knowing is in what circumstances would you want to have two separate references for the same object when you could just use the original? Eg. v1
class ObjectValue{
int objVal = 1;
}
class ObjectValueTestDrive{
public static void main(String [] args){
// "Value of v# should be" refers to if it copied the given object values, instead of referencing the same object
ObjectValue v1 = new ObjectValue();
System.out.println("Value of v1 should be 1:" + " "+ v1.objVal);
[code]....
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Oct 16, 2014
Java Code:
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.sql.*;
public class TestSerializer
[Code] .....
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Jan 5, 2014
One of the classes that i need to serialize includes a few Timers. When I serialize it and then load it up again, the Timers are stopped. How do I start the timers where they left off?I'm using Swing Timers. Should I be using the other kind?
I using the Timers in this case to change something after a countdown, but only once, then the Timers are stopped. I set the Timer tick interval to the time I want it to wait. Should I be using smaller tick intervals, and just waiting for the tenth (or so) tick, or is my way fine?
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May 21, 2014
My multi threaded application processes and loads records into an ECM repository. For reconcliation purposes , I am trying to build an XML format report with the results of the processing per record, while processing is underway per thread. The method below is called from every thread wvery time its ready to append an element to the DOM with the status.
public void writeReportLine(Element rptLine) {
// Write output to report file
synchronized (XMLReportHandler.class) {
reportOutput.getDocumentElement().appendChild(rptLine);
}
}
After all processing completes, the below method is called only once by every thread to write to the File on the file system:
public void writeToReportFile() {
synchronized (XMLReportHandler.class) {
try{
//write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(reportOutput);
[Code] ....
The problem is that when under load, the threads just seem to hang while the transformer.transform(source, result) call keeps getting executed until there is an interrupt of some sort. I was able to examine a section of what was appended and it was status for records that had finished processing very early in the process based on my application logs. Once an interrupt is recieved , it looks like the threads recover.
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Apr 22, 2015
How to create object for "class B" and call the "function_B" from other different class D where class D has no connection with class A? Here is my program.
public class A(){
void print(){}
}
class B{
void function_B(){}
}
class C{
void function_C(){}
}
Here, A, B, C are in the same package. But class D is in different package.
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Dec 8, 2014
I have i am trying to implement tooltip through javascript, like when we click on an image link tooltip should be displayed and it should have close button/ close image to close that tooltip.like the same way i will have multiple images on page, when ever i click on the images all tooltips should be displayed on the page when ever i want to close that then only it should close through close button on tooltip.can we do it through java script or will go for jquery.
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Jan 11, 2014
Following are the expressions? I tried running them and those are the answers I got. However, I cannot figure out the working.
//c = ++a + a++ - --a - a-- + a * + a/a ; //ans is 10
//c= a* + a/a ; ans. is 1.
//c= a * +3 ; //ans is 30
//c =5+ a* +2; //25
// c= 5+ a* + a/a ; //ans. is 15.
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Oct 14, 2014
I am new to Java and I am having trouble figuring out why input.nextDouble(); is not working for the multiple doubles.
import java.util.Scanner;
public class SimpleMenu
{
public static void main(String [] args)
{
int userInput;
int input = 0;
double circleArea = 0;
double triangleArea = 0;
double rectangleArea = 0;
[Code] ....
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Apr 11, 2014
This is my assignment.
Identify how multiple inheritance is possible in Java with interfaces.
Write a java programme with appropriate classes to demonstrate the above.
Hint: both inheritance and interface concepts are necessary.
For the project name in netbeans, use your id and the name "assignment" separated by underscore,
E.g. 9876543_assignment
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May 5, 2015
I'm very new to Java, and I am creating a program that takes multiple user input to create one face. I have a class for the eyes, nose, lips, and headshape. For some reason, my program is not drawing the graphics. ***for question purposes, I have only included my head shape class and my test class****
my "test" class:
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class FaceTest
{
public static void main(String[] args)
{
String head = JOptionPane.showInputDialog("Would you like a circle, square, rectangle shaped head?: ");
[Code] ....
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Jan 12, 2014
how can i implement multiple inheritance in java using interfaces. if interfaces have some methods having same name then how to distinguish that ?
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Nov 24, 2014
I am downloading around 50 PDF files programmatically using Java program(like a servlet service) one after another in for loop. I am observing that , i'm getting timeout error after few files are downloaded itself. How to solve this problem and download more files programmatically using java? The files are in my server at different location.
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Jan 24, 2014
I just started playing around with Java for awhile, but got caught up in a problem when using ArrayList.
CinemaAppMain
public class CinemaAppMain {
public static void main(String[] args) {
new CinemaApp().start();
[Code]....
I am trying to get the movie name and theatre title from their ArrayList, and I know I need to go through the movie list & theatre list to find their name & title, and compare it with the user input and print out the result.
I use for(int i=0;i<movies.size();i++) to go through the the movie list, and I tried using for(int i=0;i<theatres.size();i++) to go through the theatre list. But when I printing multiple time with different user input value, it will show me strange result (screening have same movie name & theatre name, the else if statement is printed below the user input, user input is printed more than once after the first time).
Edit: I know its wrong for me to use nested for loop,if not, another solution is needed to get the item inside both of the list. (getting the "title" from movie list & "name" from theatre list)
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Oct 22, 2014
My application (e.g., the print dialog box) needs to support multiple languages (user selected either at starting application or by switch in code).
How can this be achieved under Windows 7, Enterprise (works OK under Linux). I have tried : E.g.,
Locale.setDefault( .. );
JComponent.setDefaultLocale(Locale.LANG);
Setting resource bundle
but to no avail. The application always inherit the Win 7 system locale.
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Apr 3, 2014
how to do multiple inheritance without sing interface in java?
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Aug 16, 2014
I studied that java does not support multiple inheritance using classes. It is fine practically, but I have still a question in mind:Lets see the below code.
class Test{
------
------
}
class MyTest extends Test{
---------
---------
}
Here, as we know that that Object is Super class for every class in java. and I have already extends a Test class in MyTest.My question is: How is it possible to extend features of two class at the same time?
Theoretically,
MyTest extends Object &
MyTest extends Test.
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Aug 14, 2014
I am trying to execute the following method: This method takes a delivery date as one of the arguments and a list of calendar holidays as another argument. If the delivery date is present in the holiday list, I will add 1 day more to the delivery date and check again if the new delivery date is part of holiday list.
Issue is that the last 3 statements before 'return' are getting executed multiple times though there is no for or while loop. Why they are getting invoked multiple times.
@SuppressWarnings("rawtypes")
private String fetchNextWorkingDay(String sDeliveryDate, Element eleCalendarDayExceptions, SimpleDateFormat sdf, Format formatter) throws Exception {
System.out.println("");
System.out.println("Inside fetchNextWorkingDay method");
System.out.println("Del Date to compare is "+sDeliveryDate);
Boolean isDateSet = true;
[Code] .....
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Jan 13, 2014
I developed a simple java gui . On running a frame opens with 5 buttons and each button opens another frame when selected. There are no errors and frames open and close as required however i see that only the main program frame has the icon and title that i assigned and the frames bieng called through the buttons have the default frame with java icon and no title although it's been specified in the code of these called frames. When these called frames are executed individually though the program the title and icon are displayed.
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Feb 3, 2014
Can I store multiple rows of a table in a two dimensional string array in java.. The table has 3 columns and approximately 10,000 rows.. Some pointers for coding to achieve this...
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May 17, 2014
I am trying to compile multiple jar files into one jar file from inside a java program. I know how to do this with shell scripts but I would rather have a universal application than one that will only run on Mac, Windows, or Linux. This is my current compiler code:
if(System.getProperty() == "Mac OS X"){
Runtime.getRuntime().exec("javac -classpath jar1.jar; jar2.jar");
}
I would then continue this on for Linux and Windows, but this limits my application.
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Feb 11, 2015
I am new in java. I executed a java program using eclipse. the program contain two java file. when i try to run it using terminal in Ubuntu. Two files are not linking. it shows error. i am attaching all the data.
It shows the following error
regex2string.java:83: error: cannot find symbol
str = randomstr.nextString(2000);
^
symbol: variable randomstr
location: class regex2string
1 error
[Code] ...
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Oct 20, 2014
I have to write a short quiz that consists of 3 multiple choice questions. When the question is answered wrong I have to get it to loop back and ask the same question until the question is answered right.
I think I have the majority of my variables assigned and I have the scanner set up.
System.out.println("Question 1- Which TV sitcom recently had it's 20th anniversary?");
System.out.println("1. Two and a half men " + question1 + ".Friends 3.The Fresh Prince of Belair h.Get a hint");
answer2 = stdIn.nextInt();
if (answer2 != question1) {
System.out.println("Your answer was incorrect, please try again or pick h for a hint");
} else {
}
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