Java File class

Java class files in an abstract way represents the file name and directory path name. This class is mainly used to create files and directories, delete files and find files.

File object represents the actual existence of the disk files and directories. Create a File object constructed by the following method.

String to create a new File instance given by the parent abstract pathname and a child pathname.

File(File parent, String child);

By the given pathname string into an abstract pathname to create a new File instance.

File(String pathname) 

String to create a new File instance from a parent pathname string and a child pathname.

File(String parent, String child) 

By the given file: URI into an abstract pathname to create a new File instance.

File(URI uri) 

After you create a File object, you can use the following method of operating the file list.

Examples

The following example demonstrates the use of File object:

import java.io.File;
public class DirList {
   public static void main(String args[]) {
      String dirname = "/java";
      File f1 = new File(dirname);
      if (f1.isDirectory()) {
         System.out.println( "Directory of " + dirname);
         String s[] = f1.list();
         for (int i=0; i < s.length; i++) {
            File f = new File(dirname + "/" + s[i]);
            if (f.isDirectory()) {
               System.out.println(s[i] + " is a directory");
            } else {
               System.out.println(s[i] + " is a file");
            }
         }
      } else {
         System.out.println(dirname + " is not a directory");
    }
  }
}

The above examples compiled results are as follows:

Directory of /mysql
bin is a directory
lib is a directory
demo is a directory
test.txt is a file
README is a file
index.html is a file
include is a directory