Created
July 19, 2019 15:08
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NumberClassifier-JAVA8.ver
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import java.util.List; | |
import java.util.stream.Collectors; | |
import java.util.stream.IntStream; | |
import java.util.stream.Stream; | |
import static java.lang.Math.sqrt; | |
import static java.util.stream.Collectors.toList; | |
import static java.util.stream.IntStream.range; | |
public class NumberClassifier { | |
// BEGIN java8_filter | |
public static IntStream factorsOf(int number) { | |
return range(1, number + 1) | |
.filter(potential -> number % potential == 0); | |
} | |
// END java8_filter | |
public static int aliquotSum(int number) { | |
return factorsOf(number).sum() - number; | |
} | |
public static boolean isPerfect(int number) { | |
return aliquotSum(number) == number; | |
} | |
public static boolean isAbundant(int number) { | |
return aliquotSum(number)> number; | |
} | |
public static boolean isDeficient(int number) { | |
return aliquotSum(number) < number; | |
} | |
} |
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