FileInfo.java

/*
    FileInfo.java
    CIS 260
    David Klick
    2006-01-25

This program demonstrates the use of the File
    class to find out information about a file.
*/

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

public class FileInfo {
    public static void main(String[] args) {
        String strIn;   // holder for user input

// open keyboard input and get file/path spec from user
        Scanner kbd = new Scanner(System.in);
        System.out.print("Enter path of file to examine (QUIT to exit): ");
        strIn = kbd.nextLine();
        while (!strIn.equalsIgnoreCase("QUIT")) {
            // create new File object
            File f = new File(strIn);

// display file information      
            if (!f.exists()) {
                System.out.println(strIn + " does not exist");
            } else {
                StringBuffer s = new StringBuffer();
                if (f.isFile()) s.append(f.getName() + " is a file\n");
                if (f.isDirectory()) s.append(strIn + " is a directory\n");
                if (!f.isAbsolute()) {
                    s.append(strIn + " is not an absolute path\n" +
                        "The absolute path is " + f.getAbsolutePath() + "\n");
                } else {
                    s.append(strIn + " is an absolute path\n");
                }
                s.append(strIn + " is " + (f.canRead()?"":"not ") + "readable\n");
                s.append(strIn + " is " + (f.canWrite()?"":"not ") + "writeable\n");
                if (f.isFile()) s.append("The length is " + f.length() + "\n");
                Date d = new Date(f.lastModified());
                s.append(strIn + " was last modified on " + d + "\n");
                if (f.isDirectory()) {
                    String[] files = f.list();
                    s.append("\nThe files in this directory are:\n");
                    for (String str : files) s.append(str + '\n');
                }
                System.out.println(s);
            }

// ask for next file/path spec   
            System.out.print("Enter path of file to examine (QUIT to exit): ");
            strIn = kbd.nextLine();
        }      
    }
}