What is use of interface in Java language?

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Pawan Kumar Saini

More than 12 years of experience in IT Industry including Science/Computer teaching

Interface are used to code re-usability, and they are the real driver of ploymorphism in Java. Interface are also allows multiple inheritance in java.
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interface is mainly used for multiple inheritance which is not available directly in java. Here only methods are named but not defined.
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16 Yrs of Experience in Teaching

It's like forcing to someone implement this task any how .. java does not support multiple inheritance , if i want to force by abstract class and also extends some other class it is not possible , so we can force it by interface we can also implement multiple interfaces at a time , interfaces have abstract...
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It's like forcing to someone implement this task any how .. java does not support multiple inheritance , if i want to force by abstract class and also extends some other class it is not possible , so we can force it by interface we can also implement multiple interfaces at a time , interfaces have abstract methods which must be implemented by extended class .... usually as a team leader of 15 employees i used to create interface to take surety that every class has same method name. read less
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Trainer

Interface is used when There only abstract methods in the java interface not method body. It is used to achieve fully abstraction and multiple inheritance in Java.
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It allows your class to have the functionality of other class without inheriting them. You can implement an interface to provide any specific functionality to your class.
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Software Development Trainer

Java doesn't support multiple inheritance. Interfaces are a way to do so. Also, for abstraction interfaces are used. For syntactical enforcement also, we use interfaces to make sure every class inheriting the interface, override the methods defined in the interface. For loose coupling also, we use in...
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Trainer

As you know that Java does not allow multiple inheritance. Sometime in our real life we need to use multiple inheritance for example an amphibious animal inherits the behaviours of Aquatic and Terrestrial animals together, i.e. can walk on land as well as swim in water. To show the relationships in...
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As you know that Java does not allow multiple inheritance. Sometime in our real life we need to use multiple inheritance for example an amphibious animal inherits the behaviours of Aquatic and Terrestrial animals together, i.e. can walk on land as well as swim in water. To show the relationships in Java we can use Interface, which allows a class to implement more than one interface at a time. Moreover if we want to make all methods as abstract, we can use interface and provide the freedom to end developer to write own definitions for all methods in the implementing (concrete) class. read less
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Experienced Software Professional

It is a contract or behaviour which a class that implements that interface must implement. Another use it that it lets Java programs implement "Multiple inheritance of TYPE" which is the ability to implement more than one interface.
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IT Professional Trainer with 13 years of experience in IT industry + Academics

Java doesn't support multiple inheritance. In terms of interface you can implement that concept because You would be allowed to implement more than one interfaces in one class
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Principal Software Engr with good JAVA, J2EE, SQL skills

we can use interfaces for implementing the concept of multiple inheritance..
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