8.When we call objective c is runtime language what does it mean? 我们说的oc是动态运行时语言是什么意思? 答案:多态。 主要是将数据类型的确定由编译时,推迟到了运行时。 这个问题其实浅涉及到两个概念,运行时和多态。 简单来说,运行时机制使我们直到运行时才去决定一个对象的类别,以及调用该类别对象指...
Polymorphismmeans that an object can mean or be used differently in different contexts. Inheritance means that object classes can reuse code from other classes. For example, relationships between objects can be assigned to create a class hierarchy, which enables developers to reuse coding logic to c...
What does HTML format mean? Define polymorphism and how is used in OOP. What is a CSS selector? What does span mean in HTML? (a) What is a constructor in java? Explain. (b) Give an example. What does h4 mean in HTML? What does td mean in HTML?
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What does a question mark mean in JavaScript? What is a WYSIWYG? Define polymorphism and how is used in OOP. What is an impact driver? What is a file attachment? What is malware? What is an example of a sound bite? What is abstraction in programming language?
always overridden method call here ends up being between the two. I suspect that this is because the method itself has multiple possible subclass implementations and consequently the compiler needs to insert a type guard. The mechanics of this are explained above in more detail underPolymorphism. ...
Inheritance and the use of polymorphism mean that data models may be reused, modified, and extended as needed in the application. Potential/Specific Problems of Object-Oriented Databases 1. Lack of Standardization OODBs do not incorporate a standard of their own, which, in contrast to the relati...
If Java, if you are not careful you can possibly hide both methods and variables of the superclass. Now you must be wondering what does it mean by hiding a variable or method in Java? A field or variable is said to hide all fields with the same name in superclasses. Similarly, a ...
When different classes implement the same-named method, a program can better use polymorphism in its design. 8. Easy to bring changes: Library code reused in our programs keeps on constantly improving by the libraries’ developers. So, the benefits of these improvements can be made in your ...
> A + sign should not mean something different in your program than it means in mine. Do you disagree with Java’s usage of “+” to append strings together then? Who’s right, the half of the languagespace using “+” for string concatenation, or the other half using it exclusively ...