I refactored the solution that Narek had to create (according to me) a slightly more efficient and easy to understand code. I used embedded Automatic Resource Management, a recent feature in Java and used a Scanner class which according to me is more easier to understand and use.
Here is the code with edited Comments:
public class RemoveLineInFile {
private static File file;
public static void main(String[] args) {
//create a new File
file = new File("hello.txt");
//takes in String that you want to get rid off
removeLineFromFile("Hello");
}
public static void removeLineFromFile(String lineToRemove) {
//if file does not exist, a file is created
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
System.out.println("File "+file.getName()+" not created successfully");
}
}
// Construct the new temporary file that will later be renamed to the original
// filename.
File tempFile = new File(file.getAbsolutePath() + ".tmp");
//Two Embedded Automatic Resource Managers used
// to effectivey handle IO Responses
try(Scanner scanner = new Scanner(file)) {
try (PrintWriter pw = new PrintWriter(new FileWriter(tempFile))) {
//a declaration of a String Line Which Will Be assigned Later
String line;
// Read from the original file and write to the new
// unless content matches data to be removed.
while (scanner.hasNextLine()) {
line = scanner.nextLine();
if (!line.trim().equals(lineToRemove)) {
pw.println(line);
pw.flush();
}
}
// Delete the original file
if (!file.delete()) {
System.out.println("Could not delete file");
return;
}
// Rename the new file to the filename the original file had.
if (!tempFile.renameTo(file))
System.out.println("Could not rename file");
}
}
catch (IOException e)
{
System.out.println("IO Exception Occurred");
}
}
}