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FEN 2013-05-01KbP: Seminar 2/JML-Intro1 JML Introduktion Specifikation af en Personklasse
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FEN 2013-05-01KbP: Seminar 2/JML-Intro2 public class Person { private /*@ spec_public non_null @*/ String name; private /*@ spec_public @*/ int weight; /*@ public invariant !name.equals("") @ && weight >= 0; @*/ //@ also //@ ensures \result != null; public String toString() { return "Person(\“” +name+"\","+weight+")"; } //@ ensures \result == weight; public /*@ pure @*/ int getWeight() { return weight; } /*@ requires kgs >= 0; @ requires weight + kgs >= 0; @ ensures weight == \old(weight + kgs); @*/ public void addKgs(int kgs) { weight= weight+kgs; } /*@ requires n != null && !n.equals(""); @ ensures n.equals(name) @ && weight == 0; @*/ public Person(String n) { name= n; weight= 0; }
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FEN 2013-05-01KbP: Seminar 2/JML-Intro3 Adskild specifikation og implementation public interface PersonIF { /*@ public invariant getWeight() >= 0; @*/ //@ also //@ ensures \result != null; public /*@ pure non_null @*/ String toString(); //@ ensures \result >= 0; public /*@ pure @*/ int getWeight(); /*@ requires kgs >= 0; @ ensures getWeight() == (\old(getWeight()) + kgs); @*/ public void addKgs(int kgs); } Specifikation i interface
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FEN 2013-05-01KbP: Seminar 2/JML-Intro4 public class PersonImp implements PersonIF { private /*@ spec_public non_null @*/ String name; private /*@ spec_public @*/ int weight; /*@ public invariant !name.equals("") @ && weight >= 0; @*/ //@ also //@ ensures \result != null; public /*@ pure non_null @*/ String toString() { return "Person(\"“ +name+"\","+weight+")"; } //@ also //@ ensures \result == weight; public /*@ pure @*/ int getWeight() { return weight; } public void addKgs(int kgs) { weight= weight+kgs; } /*@ requires n != null && !n.equals(""); @ ensures n.equals(name) @ && weight == 0; @*/ public PersonImp(String n) { name= n; weight= 0; } public class PersonMain1 { public static void main(String[] args) { PersonIF p= new PersonImp("Kurt"); p.addKgs(99); System.out.println(p.toString()); } Implementation i class interface som statisk type class som dynamisk Implementation i class Constructor skal etablere invarianten.
![FEN KbP: Seminar 2/JML-Intro4 public class PersonImp implements PersonIF { private spec_public String name; private int weight; public invariant !name.equals( && weight >= also ensures \result != null; public pure String toString() { return Person(\ +name+ \ , +weight+ ) ; } also ensures \result == weight; public int getWeight() { return weight; } public void addKgs(int kgs) { weight= weight+kgs; } requires n != null && !n.equals( ensures && weight == public PersonImp(String n) { name= n; weight= 0; } public class PersonMain1 { public static void main(String[] args) { PersonIF p= new PersonImp( Kurt ); p.addKgs(99); System.out.println(p.toString()); } Implementation i class interface som statisk type class som dynamisk Implementation i class Constructor skal etablere invarianten.](http://images.slideplayer.com/12/3739272/slides/slide_4.jpg "FEN KbP: Seminar 2/JML-Intro4 public class PersonImp implements PersonIF { private spec_public String name; private int weight; public invariant !name.equals( && weight >= also ensures \result != null; public pure String toString() { return Person(\ +name+ \ , +weight+ ) ; } also ensures \result == weight; public int getWeight() { return weight; } public void addKgs(int kgs) { weight= weight+kgs; } requires n != null && !n.equals( ensures && weight == public PersonImp(String n) { name= n; weight= 0; } public class PersonMain1 { public static void main(String[] args) { PersonIF p= new PersonImp( Kurt ); p.addKgs(99); System.out.println(p.toString()); } Implementation i class interface som statisk type class som dynamisk Implementation i class Constructor skal etablere invarianten.")
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