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Note that this solution isn't very efficient (all Strings are repeatedly concatenated, which creates
a new String object at each iteration). In the next chapter, you'll see a more efficient solution
that uses joining() as follows (which internally makes use of a StringBuilder):
String traderStr =
transactions.stream()
.map(transaction -> transaction.getTrader().getName())
.distinct()
.sorted()
.collect(joining());
Listing 5.5. Are any traders based in Milan?
Listing 5.6. Print all transactions' values from the traders living in
Cambridge
Listing 5.7. What's the highest value of all the transactions?
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