I have a file called "input.txt", from that file i want to read certain data and display them. I have that file in my eclipse project folder itself. Still i'm unable to read the file.
I know its been answered before but for the life of me I can't seem to solve the problem , any help is greatly appreciate it.
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;
class FileOperations {
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
String filename;
System.out.print("Enter file name: ");
filename = input.next();
String txt = new String(Files.readAllBytes(Paths.get(filename)));
String[] lines = txt.split("\n");
for (int i = 0; i < lines.length; i++) {
String line = lines[i];
if (line.charAt(line.length() - 1) == '\r' || line.charAt(line.length() - 1) == '\n')
lines[i] = line.substring(0, line.length() - 1);
}
int result;
do {
System.out.println("\nMenu:\n1.Read and count a specific pattern of the file\n" +
"2.Read and display a specific line from the file\n" +
"3.Sort the file alphabetically (ascending)\n" +
"0.Exist");
result = input.nextInt();
input.nextLine(); // Consume newline left-over
if (result == 1) {
String pattern;
System.out.print("Enter a pattern: ");
pattern = input.nextLine();
int counter = 0;
for (String line : lines) {
counter += line.split(pattern, -1).length - 1;
}
if (counter > 0)
System.out.println("\nPattern (" + pattern + ") was found " + counter + " times.");
else
System.out.println("\nPattern (" + pattern + ") was not found!");
} else if (result == 2) {
String line;
System.out.print("Enter a line: ");
line = input.nextLine();
for (int i = 0; i < lines.length; i++) {
if (lines[i].equals(line)) {
System.out.println("\nLine (" + line + ") was found at index " + (i + 1) + " .");
break;
}
if (i == lines.length - 1)
System.out.println("\nLine (" + line + ") was not found!");
}
} else if (result == 3) {
for (int i = 0; i < lines.length - 1; i++) {
for (int j = i + 1; j < lines.length; j++) {
if (lines[i].compareTo(lines[j]) > 0) {
String temp = lines[i];
lines[i] = lines[j];
lines[j] = temp;
}
}
}
StringBuilder text = new StringBuilder();
for (String line : lines) {
text.append(line).append("\n");
}
Files.write(Paths.get(filename), (text + "").getBytes());
System.out.println("\nFile is sorted alphabetically.");
} else {
System.out.println("\nProgram Existed!");
result = 0;
}
} while (result != 0);
}
}
Output:
Enter file name: input
Exception in thread "main" java.nio.file.NoSuchFileException: input
at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:236)
at java.base/java.nio.file.Files.newByteChannel(Files.java:375)
at java.base/java.nio.file.Files.newByteChannel(Files.java:426)
at java.base/java.nio.file.Files.readAllBytes(Files.java:3272)
at FileOperations.main(FileOperations.java:14)
Can anyone point where exactly i missed? and how can i overcome this or any alternate methods for this method?
