Picking elements of a list until condition is met with Java 8 Lambdas

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If you really must use Streams API, keep it simple and use a stream of indexes:

int lastIdx = IntStream.range(0, tokens.size())
        .filter(i -> tokens.get(i).toUpperCase().endsWith("STOP"))
        .findFirst()
        .orElse(-1);

List<String> myTokens = tokens.subList(0, lastIdx + 1);

Or make a new List out of the sublist if you want an independent copy that’s not backed by the original list.

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