Question

questions based from above handout

CUNY/CSI CODE LISTING 1 public Interface Calculator f public double getCurrentValue); public class Simplecalculator implements Calculator ) public Class FinancialCalculator extends Simplecalculator public class ScientificCalculator extends SimpleCalculator [UML DIAGRAM) FIGURE Tredabie FinancialSecority +gell ost Trada Tme): Date Debt Asset Bond Stock ETF ComvertableBond (5 x 4:20 points) 17.Given the detail shown in the UML Class diagram, would the Java Compiler accept the following statement as valid? Tradable t-new Bond ) For Questions 18-21, provide the Class or Interface definition Java code for each type listed below based on UML Diagram details. Remember: in order to get full credit, your code must reflect all details defined in the diagram. 18. Tradable 19. Stock 20. Bond 1.FinancialSecurity

Answer 1

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17. Tradable t = new Bond();

This statement is completely valid since Bond implements Tradable interface indirectly. That is Bond extends Debt which extends FinancialSecurity that implements Tradable. So according to the inheritance hierarchy, Bond is a child class of Tradable.

Java code for each of the below classes/interfaces. Assuming there are no abstract classes in the diagram.

18. Tradable

import java.util.Date;

public interface Tradable {

      public double getPrice();

      public Date getLastTradeTime();

}

19. Stock

public class Stock extends Asset {

      // no info about the additional data fields or methods

}

20. Bond

public class Bond extends Debt{

      // no info about the additional data fields or methods

}

21. FinancialSecurity

import java.util.Date;

public class FinancialSecurity implements Tradable {

      @Override

      public double getPrice() {

            // should return a double value

            return 0;

      }

      @Override

      public Date getLastTradeTime() {

            // should return a Date value, returning null for now.

            return null;

      }

}