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  1. import java.util.stream.Stream;
  2. import java.util.stream.DoubleStream;
  3. import java.util.Arrays;
  4. import java.util.function.Function;
  5.  
  6. public class Main {
  7.     static final double[] percents   = {0.10, 0.15, 0.25, 0.28, 0.33, 0.35};
  8.     static final double[] thresholds = {8350, 33950, 82250, 171550, 372950};
  9.  
  10.     public static void main(String[] args) {
  11.         double[] partialSums = Stream.iterate(0, n -> n + 1).limit(5).mapToDouble(
  12.             (i) -> thresholds[i] * (percents[i] - percents[i + 1])
  13.         ).toArray();
  14.  
  15.         Function<Double, Double> computeTax = (income) -> {
  16.             int level = (int)Arrays.stream(thresholds).reduce(0, (x, y) -> x + new Boolean(income > y).compareTo(false));
  17.  
  18.             return Arrays.stream(partialSums).limit(level).reduce(0, (x, y) -> x + y) + income * percents[level];
  19.         };
  20.  
  21.         double tax = computeTax.apply(100000.0);
  22.         double controlValue = 8350 * 0.10 + (33950 - 8350) * 0.15 +
  23.             (82250 - 33950) * 0.25 + (100000 - 82250) * 0.28;
  24.         System.out.println("Tax is " + (int)(tax * 100) / 100.0);
  25.         System.out.println("Control value is " + (int)(controlValue * 100) / 100.0);
  26.     }
  27. }
  28.  
Success #stdin #stdout 0.19s 37180KB
comments (?)
stdin 
Standard input is empty
stdout 
Tax is 21720.0
Control value is 21720.0
https://ideone.com/UbM7mL
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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