Assume the existence of an interface, commdevice, with the following methods: transmit: accepts two string parameters and returns nothingreceive: accepts two string parameters and returns a booleandefine a class, firewall, that implements the above interface, and has the following members: a string instance variable, permittedreceivera string instance variable, buffera constructor that accepts a string parameter that is used to initialize the permittedreceiver variablean implementation of the transmit method that assigns the first parameter to the destination instancevariable and the second to the buffer variable. it also send to system. out the message "data scheduledfor transmission to dest" where dest is replaced by the actual value of the destination string. an implementation of the receiver method that checks if the first parameter is equal to the permittedreceiver andif so it sets the buffer instance variable to the second parameter and returns true; otherwise it sets the buffer to the empty string, prints the message"attempted breach of firewall by < receiver> " where < receiver> is replaced by the method's first parameter, and returns false.

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a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.