Help with Abstract Classes please.

Code:

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public abstract class Component {
        int age;
        public int getAge() {
                return age;
        }
}

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Code:

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public class ConrecteComponent extends Component {
        public ConrecteComponent(int age) {
                this.age = age;
        }
}

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Code:

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public abstract class Decorator extends Component {
        Component comp;
        int extraAge;
        public Decorator(Component comp) {
                this.comp = comp;
        }
        public int getAge() {
                return comp.age + extraAge;
        }
}

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Code:

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public class ConcreteDecoratorA extends Decorator {
        int extraAge = 15;
        public ConcreteDecoratorA(Component comp) {
                super(comp);
        }
}

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Code:

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public class DecoratorTestClass {
        public static void main(String[] args) {
                ConrecteComponent myComponent = new ConrecteComponent(5);
                ConcreteDecoratorA myDecorator = new ConcreteDecoratorA(myComponent);
                System.out.println(myDecorator.getAge());
        }
}

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I am expecting the output to be 20 but the output is 5.

Why is the int

Code:

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extraAge = 15;

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is not taken into account ?

Thank you.

This is very similar to your other question. Again, you should read the inheritance java tutorials fully so that you understand it properly.

Here is the link again:
Inheritance (The Java™ Tutorials > Learning the Java Language > Interfaces and Inheritance)