Create a vocabulary drill for a foreign language. Begin by creating a class, Vocabulary, of word pairs. For each pair, one word or phrase is in the primary language—English, for example—and the other is in the language to be learned. Associated with each word is a count of the number of times the user of the drill has answered correctly.
Now create an array list of Vocabulary objects, each of which contains one pair of words. At random, select an object in this list, and randomly present one of the words in the object for the user to translate. Indicate whether the user’s translation is correct. If it is, count it; if it is not, present another word at random. If the user is able to translate a particular word correctly a predetermined number of times, do not present that word again.
For example, a drill for an English-speaking user who is learning German might contain the following dialogue:
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