By Kevin Lano
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54 Chapter 3. alarm = true. Therefore, if some event sets a sensor to the triggered state, the response to this event (whether performed in the Sensor class, the System class or both) must set the alarm on, in order that the constraint remains true. triggered =~ alarm = true but this is less implementation-neutral: as an invariant of System it suggests that the code to maintain it will be in the System class. f, for each class Ei. If two classes Ei and Ej have the same feature name f, these can be disambiguated in C by prefixing the feature by the name of the class as Ei :: f or Ej :: f.
Likewise for any set e of C objects, e[val] abbreviates e l ( k e y = val). Identity attributes correspond to primary keys in database terminology. As an example of the use of sets and identity attributes in specification, consider the problem of defining a lottery game, in which the computer generates six random numbers, and the human player then makes six guesses. The system then calculates their s c o r e - how many numbers they guessed correctly. 16 shows this system. 16: Class diagram of lottery system are generated is expressed by the postcondition of generateNumbers: it puts 6 different IntegerObject objects into the set lotteryNumbers, these objects must also have different values because value is an identity attribute.
2. Express preconditions of operations of a class - properties of the object responding to the operation, and of the operation input parameters, which are required to be true when it starts execution. 3. Express postconditions of operations of a class - properties of the object responding to the operation, and of the operation output parameter result, if present, which are required to be true when the operation completes execution. To these we add a further category: 9 Properties which relate the state of several classes, in particular, the states of objects of these classes which are linked by specific associations between them.