Answered! How do you make a registry persistent in Java? All the information must be saved to the file system upon exiting the program and after any major changes….

How do you make a registry persistent in Java? All the information must be saved to the file system upon exiting the program and after any major changes.

Expert Answer

 at the instant our address applications data only stored in memory.each time we close the application the data is lost.so it’s about time to start idea about steadily storing data.

Explanation to how to saving user preferences :
the java language allows us to keep some submission state of an user information or user submission data can be saved by using a class called preferences.
saving user preferences can mainly depending upon on the system os, the preferences are saved in different places in the system
for example in some systems the registry file can be used to keep some submission state of an user information in windows.

We don’t have be capable to use preferences to store our entire address book.
It can gave chance to allows us to keep a few simple application state.
The best example for that one is it can be stored the path to the last open of the that folder.
By using this information we might fill the last application state at any time the user restarts the application.
Here below I am showing how two methods take care of save and retrieve Preferences.add them to the end of your

Example:

CustMpp class:
CustApp.java
public File getPersonFilePath() {
Preferences prefs = Preferences.userNodeForPackage(CustMpp.class);
String filePath = prefs.get(“filePath”, null);
if (filePath != null) {
return new File(filePath);
} else {
return null;
}
}

public void setPersonFilePath(File file) {
Preferences prefs = Preferences.userNodeForPackage(CustMpp.class);
if (file != null) {
prefs.put(“filePath”, file.getPath());

// Update the stage title.
primaryStage.setTitle(“AddressApp – ” + file.getName());
} else {
prefs.remove(“filePath”);

// update the stage title.
primaryStage.setTitle(“AddressApp”);
}
}

Explanation for how to make the persisting data as XML:

Now a days one of the most ordinary ways to persevere data is using a database.
databases usually contain some kind of relational data like tables while the data we need to save are objects.
this is called the object-relational impedance variance. It is fairly a little work to equal substance to relational database tables.
Examples some of the frameworks that help are in today world are Hibernate the most accepted one but it silent requires somewhat require a few work to set up the entire .

for our simple data model it’s much easier to use XML. It can be use a collection called JAXB Java Architecture for XML Binding which can be used as the latest to transfer data from one to one. It can be take a small amount lines of code JAXB will allow us to generate XML output like this:

Example xml output

<persons>
<person>
<birthday>1999-02-21</birthday>
<city>some city</city>
<firstName>ram</firstName>
<lastName>kim</lastName>
<postalCode>4310</postalCode>
<street>xyz street</street>
</person>
<person>
<birthday>2011-12-25</birthday>
<city>some city</city>
<firstName>kittu</firstName>
<lastName>janu</lastName>
<postalCode>2589</postalCode>
<street>abc street</street>
</person>
</persons>

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