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How to call an interface method in Java?
In order to call an interface method from a java program, the program must instantiate the interface implementation program. A method can then be called using the implementation object.
Example
public interface InterfaceDemo{
default public void displayNameDefault(String name){
System.out.println("Your name is : " + name);
}
public void displayName(String name);
public void displayNameAndDesignation(String name, String designation);
}The above interface defines three methods for displaying a name and optionally a job title. One method is a default method that contains implementation logic. The remaining two methods do not include implementation logic.
public class InterfaceDemoImpl implements InterfaceDemo{
public void displayName(String name) {
System.out.println(name);
}
public void displayNameAndDesignation(String name, String designation) {
System.out.println("Name:" + name + "\n"+ "Designation:" + designation);
}
}The above java program declares that it will implement the interface by using the implements keyword. The program is now obligated to provide java code for the two non-default methods. Accordingly, implementations of the methods are provided.
public class CallInterfaceMethod {
public static void main(String args[]){
InterfaceDemo demo = new InterfaceDemoImpl();
demo.displayName("Adithya");
demo.displayNameAndDesignation("Adithya", "Java Developer");
demo.displayNameDefault("Adithya");
}
}The above program instantiates the interface implementation. Next, each of the methods defined in the interface is called.
Output
Adithya Name:Adithya Designation:Java Developer Your name is : Adithya
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