These problems concern implementations of the Mixed Money class discussed in Sections 6.5–6.8. Use the Mixed Money interface given at the end of Section 6.5 but also include the method with a. Implement the Mixed Money class so that it stores the money in an Array List of Simple Money objects. Implement it so that there is only one Simple Money object in the list of any given currency. That is, combine Simple Money objects of the same currency in the list into a single Simple Money object. b. Implement the Mixed Money class as in the preceding problem except do not combine Simple Money objects of the same currency in the list into a single Simple Money object. c. Implement the Mixed Money class so that it stores the money in a Hash Map whose key is a Currency and whose corresponding value is a Simple Money object of that currency. In implementing the arithmetic operations, delete any key/value pairs whose amount has been reduced to 0. d. Implement the Mixed Money class so that it stores the money in a Hash Map whose key is a Currency and whose corresponding value is a long integer indicating the amount of money of that currency. In implementing the arithmetic operations, delete any key/value pairs whose amount has been reduced to 0. e. Compare the implementations of Mixed Money in the preceding four problems. Which is the most elegant? Why?
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