Web Reference: What is a Java interface?. It's a contract that states any class implementing this interface can be typed as the interface and it guarantees the methods listed in the interface will be... Nov 27, 2025 · An Interface in Java is an abstract type that defines a set of methods a class must implement. An interface acts as a contract that specifies what a class should do, but not how it should do it. There are a number of situations in software engineering when it is important for disparate groups of programmers to agree to a \"contract\" that spells out how their software interacts. Each group should be able to write their code without any knowledge of how the other group's code is written. Generally speaking, interfaces are such contracts.
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