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Headline

Next to Model field, a Field category in Language:JML.

Description

Ghost fields can be initalized with values, which do not depend on any Java state in the code. But therefore you need to initialize it with a value and change its statement in the java code by using the "set"-keyword. So you can acess a value which is not directly a java variable. For the correct use take a look at the Illustration below.

Illustration

In the following example we will initialize a Ghost Field in the Feature:Cut, which should take care, that a employee´s salary can just get cut one time. Therefore we initialize a boolean Ghost Field in the employee class, which is false at the beginning and when the cut function gets called, it changes to true. 

public class employee{
public double salary = 1000;
(...)
// Initialization of the Ghost Field
//@ public ghost boolean gotCut = false;

    // Precondition, that takes sure that gotCut is equal to false
    //@ requires gotCut == false;  
    public void cut(){
    salary = salary/2;
    // Setting the Ghost Field gotCut to true;
    //@ set gotCut = true;
    }
(...)
}
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