Code cleanup (#1461)
* Code cleanup * Fix flux tests * Fix checkstyle errors * Fix compile error
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@ -34,7 +34,7 @@ import java.util.List;
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public class World {
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private List<String> countries;
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private DataFetcher df;
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private final DataFetcher df;
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public World() {
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this.countries = new ArrayList<String>();
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