searching linkedlist based on an object member rather than a whole object

hi -

i am a beginner in java. i am trying to write a web crawler in java and am faced with the following problem:

i have a class RobotProhibition comprising of 2 members:
1. a string containg the host: e.g. www.google.com
2. a linked list containing all realtive-urls that are prohibited for access by robots.

now i have defined a linked list of objects of type RobotProhibition:
LinkedList<RobotProhibition> RPList = new LinkedList<RobotProhibition>();

now i want to search the linked list for a particular host based on the value of the string field, e.g. to search for element having
host = www.google.com

however, the standard methods in the Linked List class allow me to search through objects as parameters, i.e. i have to pass the
comlpete object (string+linkedlist) to find a corresponding entry. i want to search on the basis of just the host string, that is a
member of the object.

how can i do it?

please guide.

regards.
siddhartha