AnotherData.java

public class AnotherData {
    private final int data;

    AnotherData(int data) {
        this.data = data;
    }

    public int acquireData() {
        return data;
    }

}

Data.java

public class Data {
    private final int data;

    Data(int data) {
        this.data = data;
    }

    public int getData() {
        return data;
    }
}

DataLayer.java

public class DataLayer<T> {

    protected T data;

    public DataLayer(T data) {
        this.data = data;
    }

    public int getData() {
        throw new UnsupportedOperationException("Not implemented.");
    }
}

DataManipulator.java

public class DataManipulator<T> {

    public DataManipulator(DataLayer<T> data) {
        System.out.println(data.getData());
    }

}

Main.java

public class Main {

    public static void main(String[] args) {
        Data D1 = new Data(42);
        AnotherData D2 = new AnotherData(24);
        ThirdData D3 = new ThirdData(69);

        new DataManipulator<Data>(new DataLayer<>(D1) {
            public int getData() {
                return data.getData();
            }
        });

        new DataManipulator<AnotherData>(new DataLayer<>(D2) {
            public int getData() {
                return data.acquireData();
            }
        });

        new DataManipulator<ThirdData>(new DataLayer<>(D3) {
            public int getData() {
                return data.getData();
            }
        });
    }
}

ThirdData.java

public class ThirdData {
    private final int data;

    ThirdData(int data) {
        this.data = data;
    }

    public int getData() {
        return data;
    }
}