These details are completely hidden in the implementation of the walk and eatFood body functions and are, therefore, us abstracted away from the end user. Therefore, if a class inherits from another class, it automatically obtains a lot of the same functionality and properties from that class and can be extended to contain separate code and data.
Consider two classes: one being the superclass—or parent—and the other being the subclass—or child. The child class will inherit the properties of the parent class, possibly modifying or extending its behavior. Example: For instance, in the animal world, an insect could be represented by an Insect superclass. All insects share similar properties, such as having six legs and an exoskeleton.
Subclasses might be defined for grasshoppers and ants. Because they inherit or are derived from the Insect class, they automatically share all insect properties. In OOP, polymorphism allows for the uniform treatment of classes in a hierarchy. Therefore, calling code only needs to be written to handle objects from the root of the hierarchy, and any object instantiated by any child class in the hierarchy will be handled in the same way.
At run-time, the appropriate function will be called depending on the type of object passed leading to possibly different behaviors. Another function can, then, be written that accepts any Animal object as a parameter and invokes its "makeNoise" member function. Find jobs. Company reviews. Find salaries. The system is conceived as a set of interacting subsystems that in turn is composed of a hierarchy of interacting objects, grouped into classes.
System design is done according to both the system analysis model and the proposed system architecture. Here, the emphasis is on the objects comprising the system rather than the processes in the system. In this phase, a design model is developed based on both the models developed in the system analysis phase and the architecture designed in the system design phase.
All the classes required are identified. The associations between the identified classes are established and the hierarchies of classes are identified. Besides, the developer designs the internal details of the classes and their associations, i. In this stage, the design model developed in the object design is translated into code in an appropriate programming language or software tool. The databases are created and the specific hardware requirements are ascertained.
Developing medium and large scale software systems requires analysis and design prior to implementation. This subject introduces students to software design, with specific focus on object-oriented design, and the implementation of designs using an object-oriented programming language.
The subject aims to lay the foundations to software design, and is the first subject of a sequence of subjects that teaches the students the concepts in software design.
Undergraduate subjects Graduate subjects Research subjects.
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