Contents

import java.util.stream.IntStream;

final class DifferenceOfSquaresCalculator {

    int computeSquareOfSumTo(final int input) {
        final int sum = input * (input + 1) / 2;
        return (int) Math.pow(sum, 2);
    }

    int computeSumOfSquaresTo(final int input) {
        return IntStream.rangeClosed(1, input)
                .map(i -> (int) Math.pow(i, 2))
                .sum();
    }

    int computeDifferenceOfSquares(final int input) {
        return computeSquareOfSumTo(input) - computeSumOfSquaresTo(input);
    }

}

Version data entries

229 entries across 229 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.179	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.178	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.177	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.176	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.175	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.174	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.173	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.172	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.171	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.170	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.169	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.167	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.166	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.165	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.164	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.163	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.162	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.161	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java
trackler-2.2.1.160	tracks/java/exercises/difference-of-squares/.meta/src/reference/java/DifferenceOfSquaresCalculator.java