Difference Between Serialization Vs Externalization

Dec 4, 2013

Difference between Serialization Vs Externalization

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What Is Serialization In Java

Apr 8, 2015

what is seriazable.But I am not able to come that why it is used and when should I declare my class(Object) as serialzable and when not?

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How To Use Serialization In Singleton

Nov 28, 2014

What is serialization in Java ?how to use serialization in Singleton?

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Different Hashcode For Object Before And After Serialization

Mar 11, 2014

I am studying Serialization from the SCJP 6 Kathy Sierra book. I came across this code snippet.

public class Cat implements Serializable {
public static void main(String[] args) {
Cat c = new Cat();
try {
FileOutputStream fs = new FileOutputStream("testSer.ser");
ObjectOutputStream os = new ObjectOutputStream(fs);
os.writeObject(c);

[code]....

The output is as follows.

files.Cat@4d43691d
files.Cat@7f39ebdb

1) Why are the two hashcodes different?

2) Serialization is supposed to make and identical copy of any object and all its instance variables. So, if the hashcodes are different, are these objects located in different locations in heap?

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Java Swing App Serialization

Jan 19, 2014

I am trying to save a state of a big GUI Swing app. I am trying to save the containers (ArrayLists and JPanels too ). But I am recieving an exceptions:

Java Code:

ilian.Quiz.MainApp$5
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1377)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1173)
at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:162)

[code]...

What is causing it? I guess anonymous classes like new Thread(new Runnable(...) will cause errors.

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Read And Rewrite On XML File - Serialization?

May 19, 2015

I'm building GUI and whole app is going to read and rewirte on xml file..

First I make function for read and write and they are working, but now I decide to make one class where I'm going to have get and set.. This is my class wehre I need to read everything from xm class CurrentData {

private String USERNAME = "username";
private String PASSWORD = "password";
private String STATUS = "status";
public String getusername() {
return username;

[Code] ....

Now my idea is when I start app that everything from xml is going to read from xml and trough get is going to show on my interface, when I edit I'm going to save and with function create I'm going to make same xml file with different parameters... how to use serialization...

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Java Serialization With Inheritance And Aggregation

Feb 20, 2015

What is difference between Java Serialization with Inheritance (IS-A Relationship) and Java Serialization with Aggregation (HAS-A Relationship) ....

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Give A Complete Resource Of File I/O Serialization

Aug 15, 2014

Can you tell me or give a complete resource of file I/O, serialization!

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Difference Between Eclipse And JDK?

Feb 27, 2014

I'm not sure if that's the right place to ask

But I am a bit confused:

I know that JDK means "Java Development Kit" , but isn't Eclipse the same thing? (so why it's called "IDE"?)

Or maybe Eclipse is a type of JDK?

Or actually JDK and Eclipse are 2 different things

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JSF :: Difference Between EventHandler And ActionListener?

Feb 11, 2015

What Is the difference between an ActionListener and an EventHandler ?

button.addActionListener(new ActionListener() {
button.setOnAction(new EventHandler<ActionEvent>() {

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Difference Between Unused And Unread

Sep 19, 2014

exact difference between

1. unread fields
2. unused fileds

in java

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Difference Between Abstract And Inheritance

Dec 16, 2014

I am new to java i dont understand the difference between the abstract and inheritance i mean we use the abstract class with extends with other class name ,even we do that same in the inheritance pls tell me main difference between abstract and inheritance...

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Difference Between Java And JavaScript?

Jul 11, 2014

how to program in Javascript, I am wondering what are the advantages and disadvantages OR pros/cons of using JS versus say a language like Java?

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How To Calculate Difference Between Two Dates

Oct 19, 2014

I have been tasked with creating an invoice (school assignment). Part of the calculations is creating an interest depending on the amount of days between the current date entered, and invoice date entered (The program prompts the user to enter both the current and invoice dates by asking for the day, month and year).

We are also supposed to set the contructor to a default date of 1/1/1900.. but I don't know how or where to code that.

How to calculate the difference between the CurrentDate and Invoice. I have displayed the dates to the user as follows.

public void displayDate() {
System.out.println("
Today's Date: " + month + "/" + day + "/" + year);
}
public void displayInvDate() {
System.out.println("
Invoice Date: " + invMonth + "/" + invDay + "/" + invYear);

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Difference Between LinkedList And ArrayList

Feb 19, 2014

I have just begin to understand collections in Java. I read about the differences between LinkedList and ArrayList but have several doubts on it. I have mentioned them below

1) Why retrieving in ArrayList is faster then LinkedList?. Since both have the get method how does performance differ?.

2) How does re-sizing happens internally in ArrayList when a item is added or removed?. How slow this is compared to the pointer re-shuffling in LinkedList when a item is added or removed?.

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Difference Between InputStream And InputStreamReader

Jul 11, 2014

I read that InputStream is used for byte based reading it reads 1 byte at a time.And InputStreamReader is used for charcter based reading so it reads one charcter at a time so no need to convert this first to int then read it.Here is reading using InputStream.

input=new FileInputStream("D:/input.txt");
int c;
while((c=input.read())!=-1)
{
System.out.print((char)c);
}

and here is reading using InputStreamReader

input=new FileInputStream("D:/input.txt");
reader=new InputStreamReader(input,"UTF-8");
int c;

while((c=reader.read())!=-1)
{
System.out.print((char)c);
}

so what is difference between InputStream and InputStreamReader in both case i have to use a Int and then read it and at the end if I want to print that data I have to cast that with "(char)c".So what is advantage of using InputStreamReader?

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Difference Between Protected Or Default

Mar 28, 2015

I am new in java. Is there any difference between protected or default when we are talking about one package?

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JSP :: Difference Between Jspf And Tags?

Mar 12, 2015

I know jspf is a jsp fragment, but can't a tag also serve as a jsp fragment?

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Difference Between Application And Applet?

Apr 13, 2014

Can explain difference between applet and application?

What are differences in code? How to write application?

What are differences in use? I looked for some answers, but I can't understand what they are talking about.

For example:

Application:

Called as stand-alone application as application can be executed from command prompt

Applet:

Requires some third party tool like a browser to execute

But... While I export applet in exclipse I can use it without any browser, just like application(as I and avarage user knows it).

Ok, I understand difference like "Applets cannot read from or write to hard disk files."

So. What should I use while creating what?

For example, something as simple as windows calc, some 2d simply platformer, some more expanded app, like idk, spotify or media player or whatever?

Since after update 51 of java web applets are nearly useless(as I know, maybe I'm wrong?), what is better?

Can application have GUI or it is only applets thing(stupid question?)?

Where can I find any application tutorial? Everything that I found was for applets. Why?

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Difference Between JavaFX And Swing?

Jan 28, 2014

I know that oracle has released a statement saying that JavaFX will eventually replace Swing. What is the advantage of JavaFX? The new format, using "stage" instead of JFrame, seemed weird. Why is this change necessary? What benefit do we reap from JavaFX that Swing does not have?

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Difference Between Element And Index?

Apr 17, 2014

Im working on my homework and it mentioned element for one exercise and an index in another, what is the difference, If Any, Between An Element And An Index?

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What Is Difference Between Float And Double

Jan 31, 2011

What is the difference between float and double?

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Difference Between JavaSE8 And Its Predecessors?

Jul 14, 2014

If I am making an application using Java SE8 and I use new concepts of JavaSE8 like "Lambda Expressions" and "Default Methods".

After completing my application I give it to client who are using Java Platform less than 8 like Jdk1.7._; then will this application will work fine as it is working on JavaSE8.

a JavaSE8 application works well on Java SE7 platform.

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Difference Between Interpreter And Compiler?

Aug 13, 2014

I am reading a java book and find a theory about Interpreter and Compiler. explain different between them?

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Difference In Days Between Dates

Dec 5, 2013

I know this has been covered before but none of the answers made sense to me. I'm hoping there is an easy way to do this. I have 2 user inputted strings that I have converted to dates and I just want the difference in days.

My code :

import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Scanner;
import java.text.ParseException;
public class DateTest {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws ParseException {

[Code] ....

Apparently I can't just subtract the dates like I would in VB.

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Difference Between REST GET And Httpget?

Dec 2, 2014

But while searching i came across 2 different implementation.. One is this and other is this , where httpget is used..

So are these same ? When we talk about Restful, is the 2nd implementation valid ?

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