Question

I have to edit the existing file named root.propertis and update it without saving in to another file

Following is the sample proprety file.

root.label.getmore=Mehr Apps
root.msg.apps=Apps 
root.label.2.2=Coupons
root.label.35.2=MSNBC
root.label.43.2=PBS Kids
root.label.47.2=Yahoo! Digest

I have to update the string in the file "root.label.43.2=PBS Kids" to "root.label.43.2=Updated"

But i need to save in the same file (root.propertis )by repalcing the string root.label.43.2=PBS Kids.No need to update the changes in another properties file.

Answer 1

Use java.util.Properties:

File f = new File("root.properties");
FileInputStream fis = new FileInputStream(f);

Properties p = new Properties();
p.load(fis);
fis.close();

p.setProperty("root.label.43.2", "Updated");

The call p.store() to save to a file.

Note exception handling has been omitted.