Inserting package statement in Java source files
How can you automatically insert the statement 'package chapteri;' as the first line in each Java source file within a directory structure?
Use the following command to run the program: java Exercise12_18 srcRootDirectory.
Solution:
To insert the line 'package chapteri;' at the beginning of each Java source file in a directory structure, you can utilize Java.nio and I/O packages to scan the directories and process the files.
In Java, you can achieve this goal by leveraging the Java.nio and I/O packages to access files and directories. Your application would scan the source root directory and all its subdirectories, identifying Java source files. For each of these files, insert the line 'package chapteri;' at the beginning of the file.
The implementation of this process can be intricate and involves advanced concepts such as file manipulation and recursion for directory scanning.
Here is a rough skeleton of how the Java application could be structured:
import java.nio.file.*; import java.io.*; public class Exercise12_18 { public static void main(String[] args) { String srcRootDirectory = args[0]; processDirectories(Paths.get(srcRootDirectory)); } private static void processDirectories(Path dir) {...} private static void processFile(Path file) {...} }The implementation details for the methods processDirectories and processFile are left for you to complete as an exercise.