e216. controlling access to an object.txt

这里面包含了一百多个JAVA源文件

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
    }

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