Interfaces in JAVA- Types, Advantages and Disadvantages

An interface is referred to as an abstract type that determines a class's behaviour in the Java programming language. An interface is a class's blueprint in Java. A Java interface includes static constants and abstract methods. The interface is a mechanism used by Java to achieve abstraction. Only abstract methods—not method bodies—are permitted in the Java interface.

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For multiple inheritance and abstraction in Java, it is employed. In other words, interfaces have the ability to include variables and abstract methods. The technique body is impossible. The Java interface also serves as a representation of the IS-A connection.
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Interfaces' Benefits and Drawbacks

Advantages: 

• Polymorphic behaviour is mostly provided through interfaces, which also serve to decompose complicated designs and eliminate object dependencies. In its most basic form, Java allows for multiple inheritance.
• An interface's run-time injection of several concrete implementations of an interface in the application is particularly powerful in Spring Dependency Injection. Classes can reduce ripple effects by utilising references to interfaces rather than their concrete implementations since the user of an interface reference need not be concerned about changes to the underlying concrete implementation.
• Interfaces are the main tool for creating abstraction and decoupled designs between consumers and producers. They are a technique to express a contract for implementing classes to fulfil.

Disadvantages:

• Java interfaces are less flexible and faster than others.
• Interfaces should be utilised often; otherwise, they are seldom ever useful.

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