The Java Developers Almanac 1.4


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Home > List of Packages > java.security  [30 examples] > Permissions  [7 examples]

e216. Controlling Access to an Object

This example demonstrates how to protect access to an object using a permission. Only threads with the required permission can access the object.
    // Create the object that requires protection
    String secretObj = "my secret";
    
    // Create the required permission that will protect the object
    Guard guard = new PropertyPermission("java.home", "read");
    
    // Create the guard
    GuardedObject gobj = new GuardedObject(secretObj, guard);
    
    // Get the guarded object
    try {
        Object o = gobj.getObject();
    } catch (AccessControlException e) {
        // Cannot access the object
    }

 Related Examples
e212. Enabling the Security Manager
e213. Checking Read/Write Permission for a Directory
e214. Determining If One Permission Implies Another
e215. Creating a Custom Permission
e217. Listing All Permissions Granted to a Loaded Class
e218. Listing All Permissions Granted to Classes Loaded from a URL or Directory

See also: Key Store    Message Digests    Policy Files    Public and Private Keys    Signatures   


© 2002 Addison-Wesley.