For example, I have an program with an Animal abstract class and two sub-classes Dog and Bird. I want to add a new behavior for the class Animal, this is "fly". Now, I face to two approaches to solve this issue:
1. Adding an abstract method "fly" into the class Animal. Then, I force the sub-classes should be implemented this method, something like:
public abstract class Animal{
//bla bla
public abstract void fly();
}
public class Bird extends Animal{
//bla bla
public void fly(){
System.out.println("Fly high");
}
}
public class Dog extends Animal{
//bla bla
public void fly(){
System.out.println("Cant fly");
}
}
2. Creating an interfaces with method "fly" inside. The same issue to abstract class, I force the classes these implement this interface should have a method "fly" inside:
public interface Flyable{
public void fly();
}
public class Bird implements Flyable{
//bla bla
public void fly(){
System.out.println…
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