Remove the existing code from the file and add the below code to it. To understand a practical implementation let us go through some hands-on exercises. ![]() To set up the application, we will need to navigate to a path where our project will reside and I will be using Visual Studio Code as my preferred IDE. To play with nextjs let us set up some of the required dependencies.įig. It is meant for dynamic routes and runs only at build time in the production It is slower compared to getStaticProps because the page is rendered with every request. getServerSideProps – Will pre-render the page on every subsequent request.The js will statically pre-render all the paths defined by the getStaticPaths when we export a function named getStaticPaths from a page It declares a list of paths that will be statically generated. getStaticPaths – If a page has dynamic routes this method is used.Runs on every subsequent request in dev mode and its code are completely excluded from the client-side bundle ![]() It can be exported from the page file but not the component file and runs only at build time. For faster retrieval data is cached on headless cms. getStaticProps – Preloads all the data needed for a given page and renders pages ahead of the user’s request at build time.This includes pre-rendering with server-side rendering or static generation and updating or creating content at runtime with incremental static generation. Sample code shows how to retrieve the component type for an array and how to set and get fields with array or enum types.Data fetching in nextjs allows us to render the content in a different way depending on the application’s use case. Arrays and Enumerated Types This lesson introduces two special types of classes: arrays, which are generated at runtime, and enum types, which define unique named object instances. Examples are provided for setting and getting field values, invoking methods, and creating new instances of objects using specific constructors. Members This lesson describes how to use the Reflection APIs to find the fields, methods, and constructors of a class. Classes This lesson shows the various ways to obtain aĬlass object and use it to examine properties of a class, including its declaration and contents. Each lesson contains code examples, tips, and troubleshooting information. This trail covers common uses of reflection for accessing and manipulating classes, fields, methods, and constructors. Reflective code breaks abstractions and therefore may change behavior with upgrades of the platform. Exposure of Internals Since reflection allows code to perform operations that would be illegal in non-reflective code, such as accessing private fields and methods, the use of reflection can result in unexpected side-effects, which may render code dysfunctional and may destroy portability. This is in an important consideration for code which has to run in a restricted security context, such as in an Applet. Security Restrictions Reflection requires a runtime permission which may not be present when running under a security manager. Consequently, reflective operations have slower performance than their non-reflective counterparts, and should be avoided in sections of code which are called frequently in performance-sensitive applications. ![]() Performance Overhead Because reflection involves types that are dynamically resolved, certain Java virtual machine optimizations can not be performed. The following concerns should be kept in mind when accessing code via reflection. If it is possible to perform an operation without using reflection, then it is preferable to avoid using it. Reflection is powerful, but should not be used indiscriminately. Test harnesses can make use of reflection to systematically call a discoverable set APIs defined on a class, to insure a high level of code coverage in a test suite. Debuggers and Test Tools Debuggers need to be able to examine private members on classes. Visual development environments can benefit from making use of type information available in reflection to aid the developer in writing correct code. Class Browsers and Visual Development Environments A class browser needs to be able to enumerate the members of classes. Extensibility Features An application may make use of external, user-defined classes by creating instances of extensibility objects using their fully-qualified names. With that caveat in mind, reflection is a powerful technique and can enable applications to perform operations which would otherwise be impossible. This is a relatively advanced feature and should be used only by developers who have a strong grasp of the fundamentals of the language. Reflection is commonly used by programs which require the ability to examine or modify the runtime behavior of applications running in the Java virtual machine.
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