Question

To write a java program that reads a file name from the user, displays information about whether the file exists, whether the file is readable, or writable, the type of file and the length of the file in bytes.

Answer 1

import java.io.File;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("File name:");
        String fileName = in.nextLine();
        File file = new File(fileName);
        if (file.exists()) {
            System.out.println("Exist: true");
            System.out.println("Readable: " + file.canRead());
            System.out.println("Writable: " + file.canWrite());
            boolean typeFound = false;
            for (int i = fileName.length() - 1; i >= 0; i--) {
                if (fileName.charAt(i) == '.') {
                    System.out.println("Type: " + fileName.substring(i + 1));
                    typeFound = true;
                    break;
                }
            }
            if (!typeFound) {
                System.out.println("Type: UNKNOWN");
            }

            System.out.println("Length: " + file.length());
        } else {
            System.out.println("Exist: false");
        }
    }
}