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This guideline is an instance of 181. SEC51-JG17. Minimize privileged code.
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This code could be used by a client safely, as in:
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public static void main(String[] args) {
int uid = Integer.parseInt(args[0]);
UserLookupCallBack callBack = new UserLookupCallBack(uid);
CallBackAction action = new CallBackAction(callBack);
// ...
action.perform(); // Looks up user name
System.out.println("User " + uid + " is named " + callBack.getName());
}
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