Android/Java: Multiple similar classes needing a super class, not sure where to start

Question

Let's say I have 2 similar classes:

Apple.java

public class Apple {
    public string getFruitName(){
        return "apple";
    }
    public string getFruitColor(){
        return "red";
    }
}

Banana.java

public class Apple {
    public string getFruitName(){
        return "Banana";
    }
    public string getFruitColor(){
        return "yellow";
    }
}

In my application, I have a need for a global variable so I can dynamically generate a global scope banana or an apple anywhere. The catch is, I don't know which one of these is generated, it could be an apple, or a banana.

I'm guessing I need a superclass, maybe Fruit.java, and instantiate a global variable called fruit. When I call fruit.getFruitName and fruit.getFruitColor I would expect to be returned an apple or a banana, whichever was randomly generated. I just don't really know how to give all of these guys a parent class.

Example of my application

public class main extends AppCompatActivity {
    Fruit fruit;

    ...

    public void randomFruit() {
        fruit = new Fruit();
    }

    public void sometimeLater() {
        if (fruit.getFruitName == "apple"){
            //
        }
    }
}

Answer 1

You can use an interface

interface Fruit {
    String getFruitName();
    String getFruitColor();
} 

And then just implement it for both apple and banana

public class Apple implements Fruit {
    @Override
    public String getFruitName() {
        return "apple";
    }

    @Override
    public string getFruitColor() {
        return "red";
    }
}

And then you can assign banana or apple to Fruit fruit like this:

Fruit fruit = 
    ThreadLocalRandom.current().nextBoolean() ? new Apple() : new Banana();

I'd suggest you to read "Inheritance" section of The Java™ Tutorials