In this article about File handling using Swing, I'll show how to work with the methods below:

• getName: return the file name;
• length: return the file lenght;
• exists: Check if the file exists;
• canRead: return true if the file can be read;
• canWrite: return true if the file can be write;
• renameTo: rename the file;
• isFile: Return true if the path is valid for a file;
• lastModified: Show date of last file change;
• delete: Delete the file;

Now let's create the methods above:

1-GetName ( )

1.1- Create a new button and set the "label" corresponding to his action, in our case "FileName":

1.2- Enter this code in commands package.

Listing 1: GetName

package commands;
 
import java.io.File;
 
public class FileName {
     
    public String GetName(String fi){
    File f = new File(fi);
    if(!f.exists()){
      System.out.println("File not found");
      return "0";
    }
    return f.getName();
    }
}

2-Length ( )

2.1- Create a new button and set the "label" corresponding to his action, in our case "size (length)":

2.2- Write this code in commands package:

Listing 2: Length

package commands;
 
import java.io.File;
 
public class FileSize    {
     
    public Integer GetSize(String fi){
    File f = new File(fi);
    if(!f.exists()){
      System.out.println("File not found");
      return 0;
    }  
      return (int) f.length();
    }
}

3-Exists ( )

3.1- Create a new button and set the "label" corresponding to his action, in our case "Exists?"

3.2- Write this code in commands package:

Listing 3: Exists

package commands;
 
import java.io.File; 
 
public class IfExist {
    public boolean exist(String file){
    File f = new File(file);
    if(!f.exists()){
      System.out.println("File not found");
      return false;
    }
    return true;
    }    
}

4-CanRead ( )

4.1- Create a new button and set the "label" corresponding to his action, in our case "Can Read?":

4.2- Write this code in commands package: