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27: 28: 29: 30: 31: 32: 33:

<element name="SI-RESULT-MESSAGE"> <simpleType> <restriction base="string"> <maxLength value="128" /> </restriction> </simpleType> </element>

34: 35:

</sequence> </complexType>

36: </element> 37: </schema>

  • 4)

    Write a Java class JSimpleCalculator.java that implements the interface defined in ISimpleCalculator.java and provides a user interface for:

    • a)

      Specifying which computation (add, sub, mul) is desired.

    • b)

      Specifying the operands to the computation.

    • c)

      Displaying the result of the computation (can be an error). There is a great deal of flexibility in this part of the exercise. Some examples of

the types of user interfaces that can be implemented include: command-line interactive

(console-based), graphical, Java servlet (Web-based). A command-line interactive

interface was implemented for the solution. A screen capture of the interface is given

Fig. 9.5. Notice that a debugging mode is available to trace the various steps in the

process of exchanging XML between the Java and COBOL XML marshalling layers.

88

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