![]() In this example, we have an interface called a Printer that defines four methods: print(), scan(), fax(), and copy(). A client that only needs to retrieve user accounts would only depend on the interface for retrieving user accounts and would not be impacted by changes to the other interfaces. Instead of having a single large interface with methods for creating, updating, deleting, and retrieving user accounts, we could have separate interfaces for each of these tasks. Example to Understand Interface Segregation Principle (ISP) in Javaįor example, consider a system that manages user accounts. This reduces the coupling between the client and the interface and minimizes the impact of changes in the interface on the client. Each interface should provide only the methods that are required by a specific client. To avoid this issue, we should design our interfaces to be small and focused. This means that changes to those methods can impact the client, even if it does not use them. When a client depends on an interface that includes methods it does not use, it becomes coupled to those methods. Secondly, instead of creating large or you can say fat interfaces, create multiple smaller interfaces with the aim that the clients should only think about the methods that are of interest to them.īy adhering to the ISP, we can prevent clients from being burdened with unnecessary dependencies.First, no class should be forced to implement any method(s) of an interface they don’t use.Let us break down this definition into two parts. Rather than one fat interface, numerous little interfaces are preferred based on groups of methods with each interface serving one submodule. ![]() ![]() The Interface Segregation Principle states that Clients should not be forced to implement any methods they don’t use. This means that we should design fine-grained interfaces tailored to specific client requirements, rather than having large, monolithic interfaces. It advocates that clients should not be forced to depend on interfaces they do not use. The Interface Segregation Principle (ISP) is another key principle in the SOLID acronym. Interface Segregation Principle (ISP) in Java As part of this article, we are going to discuss the following pointers. The letter I in the SOL ID Design Principle stands for Interface Segregation Principle which is also known as ISP. Please read our previous article where we discussed the Liskov Substitution Principle (LSP) in Java. In this article, I am going to discuss Interface Segregation Principle (ISP) in Java with Examples. Data Structures and Algorithms Tutorialsīack to: Java Design Patterns Interface Segregation Principle (ISP) in Java.
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