- read : read permission to the file
- write : write permission to the file
- delete : delete permission to the file by calling File.delete
- readlink : read link permission
- execute : executed the permission
Declaration :
public final class FilePermission extends Permission implements Serializable
Constructors :
FilePermission(String p, String a) : Creates a new file permission object with "a" action.
Methods of FilePermission Class :
- equals(Object FP_obj) : java.io.FilePermission.equals(Object FP_obj) tells whether the two (i.e. checks the FP_obj pathname and filename with this object) FilePermission objects are equal or not.
- Syntax :
public boolean equals(Object FP_obj) Parameters : FP_obj : the FilePermission object to be verified with this object Returns : true : if both the objects are equal else, false. Exception : ----------
- Implementation :
Java
// Java Program illustrating equals() method import java.io.*;
public class NewClass
{ public static void main(String[] args) throws IOException
{
boolean bool = false ;
// Creating new FilePermissions("Path", "action")
FilePermission FP_obj1 = new FilePermission("GEEKS", "read");
FilePermission FP_obj2 = new FilePermission("ABC", "write");
FilePermission FP_obj3 = new FilePermission("GEEKS", "read");
// Use of equals method
bool = FP_obj2.equals(FP_obj1);
System.out.println("Whether FP_obj1 equals FP_obj2 : " + bool);
bool = FP_obj2.equals(FP_obj3);
System.out.println("Whether FP_obj2 equals FP_obj2 : " + bool);
bool = FP_obj1.equals(FP_obj3);
System.out.println("Whether FP_obj3 equals FP_obj1 : " + bool);
}
} |
- Output :
Whether FP_obj1 equals FP_obj2 : false Whether FP_obj2 equals FP_obj2 : false Whether FP_obj3 equals FP_obj1 : true
- getActions() : java.io.FilePermission.getActions() tells the action of this FilePermission Object. If in case there are two actions along with the object : delete and read, then the method will return “read, delete”. In such cases this method returns “canonical string” : read, write, execute, delete, readlink
- Syntax :
public String getActions() Parameters : ---------- Returns : canonical string : representing the actions associated with the object. Exception : ----------
- Implementation :
Java
// Java Program illustrating getActions() method import java.io.*;
public class NewClass
{ public static void main(String[] args) throws IOException
{
// Creating new FilePermissions
FilePermission FP_obj1 = new FilePermission("GEEKS", "read, delete, write");
FilePermission FP_obj2 = new FilePermission("ABC", "write, read, execute");
FilePermission FP_obj3 = new FilePermission("GEEKS", "delete, readlink, read");
// Use of getActions() method
String str = FP_obj1.getActions();
System.out.println("Actions with FP_obj1 : " + str);
str = FP_obj2.getActions();
System.out.println("Actions with FP_obj2 : " + str);
str = FP_obj3.getActions();
System.out.println("Actions with FP_obj3 : " + str);
}
} |
- Output :
Actions with FP_obj1 : read,write,delete Actions with FP_obj2 : read,write,execute Actions with FP_obj3 : read,delete,readlink
- hashCode() : java.io.FilePermission.hashCode() returns hash code for the argumented FilePermission Object
- Syntax :
public int hashCode() Parameters : -------- Returns : hash code value for the argumented object Exception : ----------
- Implementation :
Java
// Java Program illustrating hashCode() method import java.io.*;
public class NewClass
{ public static void main(String[] args) throws IOException
{
// Creating new FilePermissions
FilePermission FP_obj1= new FilePermission("GEEKS", "read, delete, write");
// Use of hashCode() method
int i = FP_obj1.hashCode();
System.out.println("hashCode value for FP_obj1 : " + i);
}
} |
- Output :
hashCode value for FP_obj1 : 0
- implies(Permission arg) :java.io.FilePermission.implies(Permission arg) tells whether this FilePermision has the argumented Permission or not. Syntax :
public boolean implies(Permission arg) Parameters : arg : Permission to be checked Returns : true if the FilePermission object has the argumented Permission else, false Exception : ----------
- Implementation :
Java
// Java Program illustrating implies() method import java.io.*;
public class NewClass
{ public static void main(String[] args) throws IOException
{
// Creating new FilePermissions
FilePermission FP_obj1 = new FilePermission("GEEKS", "read");
FilePermission FP_obj2 = new FilePermission("ABC", "write");
FilePermission FP_obj3 = new FilePermission("GEEKS", "delete");
// Use of implies() method
boolean check = FP_obj1.implies(FP_obj2);
System.out.println("Using implies() for FP_obj1 : " + check);
// Checked here with the same FilePermission object
check = FP_obj2.implies(FP_obj2);
System.out.println("Using implies() for FP_obj2 : " + check);
}
} |
- Output :
Using implies() for FP_obj1 : false Using implies() for FP_obj2 : true
- newPermissionCollection() :java.io.FilePermission.newPermissionCollection() creates PermissionCollection object having the FilePermission objects. Syntax :
public PermissionCollection newPermissionCollection() Parameters : arg : Permission to be checked Returns : new PermissionCollection object having the FilePermission objects. Exception : ----------
- Implementation :
Java
// Java Program illustrating newPermissionCollection() method import java.io.*;
import java.security.PermissionCollection;
public class NewClass
{ public static void main(String[] args) throws IOException
{
// Creating new FilePermissions
FilePermission FP_obj1 = new FilePermission("GEEKS.txt", "read");
// Creating new PermissionCollection
// Use of newPermissionCollection()
PermissionCollection FP = FP_obj1.newPermissionCollection();
// Collecting the Permissions of FP_obj1 for FP
FP.add(FP_obj1);
boolean check = FP.implies( new FilePermission("GEEKS.txt", "read"));
System.out.println("Is newPermissionCollection() working : " + check);
}
} |
- Output :
Is newPermissionCollection() working : true