[Solved] How to calculate percentage of matching values on two arraylists?

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Try this:

List<String> actual = new ArrayList<>();
List<String> required = new ArrayList<>();

List<String> common = new ArrayList<>(actual);
common.retainAll(required);

System.out.println(" 100.0 * common / actual = " + (actual.size() == 0 ? 0 : 100.0 * common.size() / actual.size()));
System.out.println(" 100.0 * common / required = " + (required.size() == 0 ? 0 : 100.0 * common.size() / required.size()));

solved How to calculate percentage of matching values on two arraylists?