Subtyping vs. subclassing. Substitution (subtype) — a specification notion – Every subclass is a Java subtype. • But not necessarily a true subtype. Page ...
https://www.cs.rpi.edu/academics/courses/spring21/csci2600/handout-files/files_29_03/SubtypePolymorphism.pdf
Subclasses can lead to subtype relationships. Page 4. 4 reminder: why we like true subtypes versus Java subtypes. Java requires type equality for parameters.
(For the time being we will talk about subtyping; we'll return to the differences between. Java subclassing Java subtyping
Subtyping vs. subclassing. Substitution (subtype) — a specification notion. – B is – Every subclass is a Java subtype. • But not necessarily a true subtype.
Subtyping vs. subclassing. Substitution (subtype) — a specification notion • In a Java subtype/subclass each corresponding method has: – Same argument ...
Subtyping vs. subclassing. Substitution (subtype) — a specification notion – Every subclass is a Java subtype. • But not necessarily a true subtype. Page ...
– every subclass is a Java subtype. – but not necessarily a true subtype SUBTYPES VS SUBCLASSES. Page 23. Substitution principle for methods. Constraints on ...
SUBTYPES VS SUBCLASSES. Page 4. Substitution principle for classes. If B is a • In a Java subtype each corresponding method has: – same argument types. • if ...
• Inheritance (subclass). – Abstract out repeated code. – Enables incremental changes to classes. • Every subclass is a Java subtype. – But not necessarily a
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing ... Inheritance (subclass) — an implementation notion.
https://www.cs.rpi.edu/academics/courses/spring21/csci2600/handout-files/files_29_03/SubtypePolymorphism.pdf
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing ... Inheritance (subclass) — an implementation notion.
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing ... Inheritance (subclass) — an implementation notion.
This is not the same as a Java subtype. – Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing.
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing ... Inheritance (subclass) — an implementation notion.
In Java this usually means interfaces and sometimes means abstract base classes. • In Java
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs. subclassing ... Inheritance (subclass) — an implementation notion.
Every subclass is a Java subtype Changes in superclass can break subclass (“fragile base class”). Subtyping is the ... public void put (K key V value);.
SUBTYPES VS SUBCLASSES In a Java subtype each corresponding method has: ... Java subtyping does not guarantee that overridden methods.
Java subtypes that are not true subtypes are confusing and dangerous Subtyping vs subclassing Java purposely merges these notions for classes:
Java types are classes interfaces or primitives Java has its own notion of subtype (which involves only classes and interfaces) This is a weaker notion than
A function or a data type to be written generically so that it can handle values uniformly without depending on their type • C++ Templates Java Generics •
A method expecting an object of type A will accept objects of type BC or D This gives increased generality to the code 1There are other kinds most notably
Classes and types Classes in Java play two distinct roles they introduce a “type” and they define code consisting of constructors fields and methods Consider
Why we like subclasses? True subtypes vs Java subtypes Inheritance vs Composition Substitution Principle Interfaces and Abstract Classes
S is a subtype of T (written S
11 nov 2003 · In this lecture we look at the relationship between inheritance and sub- typing in more detail First we look at the tradeoffs between
“Width” subtyping: A supertype can have a subset of fields with the same types 2 “Permutation” subtyping: A supertype can have the same set of fields with
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