Properties class

[Dinesh Tahiliani]

Hi Ranchers,

Can someone explain me how to use Properties class in java with the help of eg.

Plsssssssssssssss

[marc weber]

What do you want to do with it?

[Dinesh Tahiliani]

Can someone expalin me the Properties class in java.

I just want to know its use. i have listen that instead of doing changes in your code, you can do the changes in properties file and run your code.

[marc weber]

Originally posted by Dinesh Tahiliani:
... I just want to know its use. i have listen that instead of doing changes in your code, you can do the changes in properties file and run your code...

The Properties class has a lot of uses. Here's an example of what you're describing. Suppose you have an XML file called props.xml...

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
  <comment>Meet the Flintstones</comment>
  <entry key="boss">Mr. Slate</entry>
  <entry key="neighbors">Betty and Barney Rubble</entry>
  <entry key="dog">Jane Jetson</entry>
  <entry key="wife">Wilma</entry>
  <entry key="husband">Fred</entry>
</properties>

Here's some Java code that will read this XML file, create a new Properties instance from it, and use that to output the dog's name.

import java.util.*;
import java.io.*;
 
class NewProps {
  public static void main(String[] args) {
    Properties myXML = new Properties();
    try {
      InputStream inStream = new FileInputStream("prop.xml");
      myXML.loadFromXML(inStream);
      inStream.close();
    } catch(Exception e) {
      System.err.println(e);
    }
    System.out.println("The dog is " + myXML.getProperty("dog"));
  }
}

Now, if you compile and run this, you will see the output: The dog is Jane Jetson. You can change the dog entry to its correct value of "Dino" in the XML file...

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
  <comment>Meet the Flintstones</comment>
  <entry key="boss">Mr. Slate</entry>
  <entry key="neighbors">Betty and Barney Rubble</entry>
  [B]<entry key="dog">Dino</entry>[/B]
  <entry key="wife">Wilma</entry>
  <entry key="husband">Fred</entry>
</properties>

Then -- without recompiling the code -- you can run the Java program again to see the corrected output: The dog is Dino.

[Dinesh Tahiliani]

Thanks