Java Adapter design pattern

This pattern is very useful especially when programming language such as Java which does not

support multiple-inheritance. Following example can achieve multiple-inheritance by implementing an

adapter design pattern.

package pattern;

public interface Dog {
    public String getDogSound();
}

package pattern;

public interface Cat {
    
    public String getCatSound();

}

package pattern;

public class AnimalAdapter implements Cat,Dog {

    @Override
    public String getCatSound() {
        return "Cat sound";
    }

    @Override
    public String getDogSound() {
        return "Dog sound";
    }

}

AnimalAdapter have both cat's voice and dog's voice.

package pattern;

public class Simulator {
    
    static boolean cat = true;
    public static void main(String[]args){
        AnimalAdapter aa = new AnimalAdapter();
        if(cat){
            System.out.println(aa.getCatSound());
        }else if(!cat){
            System.out.println(aa.getDogSound());
        }
    
    }
    
}

Therefore , simulator can produce cat voice or dog voice in different situations.
Reference:Wiki Article