Changing of file extension

I am having the 1000 files in a directory and all the files are of extension
".jad". So how can i change the extension of all files from ".jad" to ".java" through a java program.

The Java File class doesn't recognise extensions as such. ".jad" is just seen as a string of four characters that may or may not be present at the end of a file name.
(1) Find the files in the directory for example with the File list() method
(2) Check whether the file name ends with ".jad" with the String endsWith() method
(3) If it does: construct a new name with substring() and string concatenation, then use the File renameTo() method to change the file name.
You might want to use the form of list() that takes a FilenameFilter. Or, perhaps better, use the listFiles() method and supply a FileFilter so that only files are considered.

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