File Handling in Java

/*

Write a Java program to accept a string from user and check whether it is a file or a directory. If it is a directory, display the files in the directory. If  it is a file, display the length of the file in bytes.

*/

 

import java.io.*;

 

class FileHandling

{

     public static void main(String as[]) throws IOException

     {

          BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

          System.out.print(“Enter string : “);

          String str = br.readLine().trim();

         

          File f1 = new File(str);

         

          if (f1.isFile()==true)

              System.out.println(“File length = “+f1.length() + ” bytes”);

         

          else if(f1.isDirectory()==true)

          {

              String s[] = f1.list();

             

              System.out.println(“Files in given directory:”);

              for(int i=0;i<s.length;i++)

                   System.out.println(s[i]);

          }

          else

              System.out.println(“Not a file or dir”);

     }

}

 

 /*

Sample Output:

 

D:\java\iostreams>javac FileHandling.java

 

D:\java\iostreams>java FileHandling

Enter string : D:/java/iostreams/FileHandling.java

File length = 863 bytes

 

D:\java\iostreams>java FileHandling

Enter string : D:/java/iostreams

Files in given directory:

FileHandling.class

FileHandling.java

 

D:\java\iostreams>java FileHandling

Enter string : asdf

Not a file or dir

 */