The java.nio.file.LinkPermission class handles permissions for link creation operations. The permission allowed by these class are as follows:
|
Permission name |
What permission allows |
Risk of granting this permission |
|---|---|---|
|
hard |
This permission allows adding an existing file to a directory. This operation is also known as creating a hard link. |
The attacker may have access to all files because this permission allows linking to any file in the file system. |
|
symbolic |
This permission allows creating file pointers. This operation is also known as creating soft/symbolic link. |
The attacker may have access to all files because this permission allows linking to any file in the file system. |
Class declaration:
public final class LinkPermission extends BasicPermission
Constructor:
| Constructor | Description |
|---|---|
| LinkPermission(String name) | This constructor is used to create a LinkPermission with the specified name. |
| LinkPermission(String name, String actions) | This constructor is used to create a LinkPermission with the specified name and action. |
 Methods inherited from class java.security.BasicPermission:
| Method | Description |
|---|---|
| equals(Object obj) | This method checks whether the two BasicPermission objects are equal or not |
| getActions() | This method returns the actions in String format |
| hashCode() | This method returns the hash code value for this object |
| implies(Permission permission) | This method checks whether the given permission is implied by this object or not |
| newPermissionCollection() | This method returns a new PermissionCollection object |
Example 1: Java program to create a new hard LinkPermission
Java
// Java program to create a new hard LinkPermissionimport java.nio.file.LinkPermission;import java.security.Permission;Â
// Driver classpublic class GFG {    // Main method    public static void main(String[] args)    {        try {            // Creating a new LinkPermission object            Permission permission                = new LinkPermission("hard");                       // Printing name of the permission            System.out.println(permission.getName());                       // Printing class of the permission object            System.out.println(permission.getClass());                       // Printing hash value of the permission object            System.out.println(permission.hashCode());        }        catch (Exception e) {            e.printStackTrace();        }    }} |
Output
hard class java.nio.file.LinkPermission 3195115
Example 2: Java program to create a new symbolic LinkPermission
Java
// Java program to create a new symbolic LinkPermissionimport java.nio.file.LinkPermission;import java.security.Permission;Â
// Driver classpublic class GFG {    // Main method    public static void main(String[] args)    {        try {                       // Creating a new LinkPermission object            Permission permission                = new LinkPermission("symbolic");                       // Printing name of the permission            System.out.println(permission.getName());                       // Printing class of the permission object            System.out.println(permission.getClass());                       // Printing hash value of the permission object            System.out.println(permission.hashCode());        }        catch (Exception e) {            e.printStackTrace();        }    }} |
Output
symbolic class java.nio.file.LinkPermission 1787985074
Example 3: Java program to compare two LinkPermission objects
Java
// Java program to compare two LinkPermission objectsimport java.nio.file.LinkPermission;import java.security.Permission;Â
// Driver classpublic class GFG {    // Main method    public static void main(String[] args)    {        try {Â
            Permission hardPermission                = new LinkPermission("hard");            Permission softPermission                = new LinkPermission("symbolic");                       // Checking is both permissions are equal or not            if (hardPermission.equals(softPermission)) {                System.out.println(                    "Both permission are equal");            }            else {                System.out.println(                    "Both permission are not equal");            }        }        catch (Exception e) {            e.printStackTrace();        }    }} |
Output
Both permission are not equal
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