Clients should not be forced to implement interfaces they do not use. Clients should not be forced to depend upon interfaces that they don't use. In this article, I am going to discuss the Interface Segregation Principle with a real-time example.The letter I in the SOLID Design Principle stands for Interface Segregation Principle which is also known as ISP.. The Interface Segregation Principle states that clients should not be forced to implement interfaces they don't use. Both should depend on abstractions. The interface segregation principle is the I in SOLID principles. THE INTERFACE SEGREGATION PRINCIPLE. Make fine grained interfaces that are client specific. Instead of one fat interface many small interfaces are preferred based on groups of methods, each one serving one submodule. The SOLID principles are closely related to one another. As a result, when an interface method changes, any clients that don't use that method should not change. Robert Martin has a very good explanation of Interface segregation principle (ISP), in his book "UML for Java Programmers". The goal of the interface segregation principle is similar to the single responsibility principle. Let's understand the principle through an example. Here is the list of the blogs in this series: Understand SOLID Principle; Single Responsibility Principle The Interface Segregation Principle and Other Solid Principles. In this tutorial, we will learn about Interface Segregation Principle.It is one of the SOLID principles. For example, the Collection interface in Java has many methods like size() and isEmpty() which are often used together, so it makes sense for them to be in a single interface. The ISP states that no client should be forced to depend on methods it does not use. Read more about interface segregation principle with an example at the Interface Segregation Principle in Java with Example. Based on that, I don't think ISP is about an interface being "focused" on one logical, coherent group of things. Table Of Contents What are SOLID Principles Single Responsibility Principle Open Closed Principle Liskov's Substitution Principle Interface Segregation Principle Dependency Inversion Principle 5 java class design principles Introduction to SOLID Principles. Dependency Inversion Principle The principle states: High-level modules should not depend on low-level modules. Because, that goes without saying; or, at least it should go without saying. Interface Segregation Principle states “Clients should not be forced to depend upon interfaces that they do not use.” The interface segregation principle means that interfaces that are too "thick" must be divided into smaller, more specific ones, so that clients using small interfaces know only about the methods they need for their work. 5. 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