• Absolute file path looks like this --> C:\downloads\file.txt is an absolute path where C is the root node

• Relative path is something lik this --> photos\img1.jog.So this path need to be combined with another path that contains the root node.

• On windows delimiter is a backslash /, on unix its a forward slash \

• We can get a path of a file lying at the root our current project using below example

 Path dataPath = FileSystems.getDefault().getPath("data.txt");

• To get path for a file lying within a folder/directory named files under our current project we use the below

 Path subDirPath  = FileSystems.getDefault().getPath("files","SubDirectoryFile.txt");
 printFile(subDirPath);

• We can also do the following to provide the absolute path as well. Please note we have to use another backslash \ to escape the backslash being used in our file path

 Path dataPath = Paths.get("C\\MyIdeaProject\\Projects\\data.txt");

We can use the below example to get the absolute or complete path of our working directory of our project.We can then print the path represented by above Path object using toAbsolutePath method.Please note it will append a /. at the end of or project directory

Path  filePath = Paths.get("."); 
System.out.println(filePath.toAbsolutePath());

Will print C:\myNewProject\Java Paths Basics .

• Please note after getting path to our root directory using . we can pass as many arguments we want to Paths.get to move down a directory structure using .
• Like we can do ".","files" ,"subfilesfolder" ,"anotherfolderinsubfiles" ,"subDirectoryFile.text" etc

    subDirPath  = Paths.get(".","files","SubDirectoryFile.txt");
    printFile(subDirPath);

• For a filr lying outside our our project we can do like this

  outsideDirPath  = Paths.get("C:\\","report\\","outthere.txt");

• Another way to do the same is using single forward slash instead of backslash line we have done below

   outsideDirPath  = Paths.get("C:","/report","/outthere.txt");
   printFile(outsideDirPath);

Method to print contents of current file

   public static void printFile(Path path){
        try(BufferedReader fileReader = Files.newBufferedReader(path)){
            String line;
            while((line=fileReader.readLine())!=null){
                System.out.println(line);
            }

        } catch (IOException e) {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
}