Java FilePermission Class
In this tutorial, we will learn about FilePermission class in Java. FilePermission class is used to represent access to a file or a directory. All the permissions are related to the path.
Syntax
The following syntax is the declaration of FilePermission class.
public final class FilePermission extends Permission implements Serializable
Constructors
| Method |
Description |
ByteArrayOutputStream() |
Creates a new byte array output stream with the initial capacity of 32 bytes, though its size increases if necessary. |
ByteArrayOutputStream(int size) |
Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes. |
Java FilePermission class Methods
| Method |
Description |
int hashCode() |
It is used to return the hash code value of an object. |
String getActions() |
It is used to return the "canonical string representation" of an action. |
boolean equals(Object obj) |
It is used to check the two FilePermission objects for equality. |
boolean implies(Permission p) |
It is used to check the FilePermission object for the specified permission. |
PermissionCollection newPermissionCollection() |
It is used to return the new PermissonCollection object for storing the FilePermission object. |
File permissions can be read, write, delete, readlink and execute.
Java FilePermission Example with getActions() method:
In the following example, we are creating a file myfile.txt with having read, delete, and write permissions. After that, we are checking for the permissions of the given file using getActions() method.
package studytonight;
import java.io.FilePermission;
public class StudyTonight
{
public static void main(String args[])
{
FilePermission fp_obj = new FilePermission("myfile.txt", "read, delete, write");
System.out.print("File permissions for myfile.txt: "+fp_obj.getActions());
}
}
File permissions for myfile.txt: read,write,delete
Java FilePermission Example with hashCode() Method
In the following example, we are generating hashCode for the FilePermission object which is passed as an argument to this function.
package studytonight;
import java.io.FilePermission;
public class StudyTonight
{
public static void main(String args[])
{
FilePermission obj=new FilePermission("myfile.txt", "read, delete, write");
int hashCode = obj.hashCode();
System.out.println("hashCode value of obj: " + hashCode);
}
}
hashCode value of obj: 1700113143
Conclusion
In this tutorial, we learned about FilePermission class in Java. FilePermission class is used to represent access to a file or a directory. All the permissions are related to the path.
