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What is use of interface in Java language?

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Expert in Java J2EE Training

Polymorphism is one of the key uses of inheritance. For ex, there are many implementations of List interface. Any implementation can be taken as a list object. List list = new ArrayList(), List list2 = new LinkedList etc., This goes to many levels.
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Software Testing Trainer(Automation)

basically its correct to achieve multiple inheritance ,since its due to abstract method .we use interface to force to use already decided design pattern
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Tutor

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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Expert in Java/J2ee technology

In Java 1.8, Interface can contain the default body of a method which is called default method.
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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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I have more than 9 years of experience in 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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Tutor

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... read more
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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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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Data Modeling, MSBI, Sql Server and ETL testing Trainer

An interface in Java has remained a complex topic for many beginners to understand. The first thing which puzzles many programmers is the fact that you cannot define any method inside interface, it a just declaration. By rule, all method inside interface must be abstract (Well, this rule is changing... read more
An interface in Java has remained a complex topic for many beginners to understand. The first thing which puzzles many programmers is the fact that you cannot define any method inside interface, it a just declaration. By rule, all method inside interface must be abstract (Well, this rule is changing in Java 8 to allow lambda expressions, now interface can have one non-abstract method, also known as a default method). So, if you can't define anything, Why we need an interface? what's the use of an interface, if we are anyway going to write a class and override them to provide behaviour, Can't we declare those methods inside the class itself without using interface etc. Well, if you are thinking in terms of behaviour then you are really missing the point of interface. read less
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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... read more
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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