SequentialStrategy.java

public class SequentialStrategy {

    private final GuessTheNumber guesser;

    public SequentialStrategy(GuessTheNumber guesser) {
        this.guesser = guesser;
    }

    public int solve() {
        for (int i=guesser.getMin(); i<=guesser.getMax(); i++) {
            if (guesser.guess(i) == 0)
                return i;
        }

        throw new IllegalStateException();
    }
}