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並前往https://stackoverflow.com/questions/12455737/how-to-iterate-over-a-set-hashset-without-an-iterator

java - How to Iterate over a Set/HashSet without an Iterator?

You can use an enhanced for loop: Set<String> set = new HashSet<String>(); //populate set for (String s : set) { System.out.println(s); }. Or with Java 8:

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