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Java Tutorial : Java abstract class(implements interface)

Person.java

public interface Person
{
    public void walk();

    public void eat();
}

abstract class Employee implements Person
{

}

class EmployeeImpl extends Employee
{

    @Override
    public void walk()
    {
        System.out.println("walking");
    }

    @Override
    public void eat()
    {
        System.out.println("eating");
    }

}

public class AbstractClassTest
{

    public static void main(String[] args)
    {
         Person personRef = new EmployeeImpl();
         personRef.eat();
         personRef.walk();
         
         System.out.println("-------------------------");
         
         Employee employeeRef = new EmployeeImpl();
         employeeRef.eat();
         employeeRef.walk();
    }

}