Scala BigDecimal类代码示例

//设置package包名称以及导入依赖的类
package org.nason.euler.twenty

import java.math.{BigDecimal,MathContext,RoundingMode}


import org.nason.euler.EulerUtils
import org.nason.euler.NumberUtils

object ProblemTwentySix {
  def main(args: Array[String])
  {
    println( solution )
  }
  
  val One = new BigDecimal(1.0)
  val BIGDECIMAL = new MathContext( 2048, RoundingMode.HALF_UP )
    
  def solution =
  {
    def reciprocal( v:Int ) = One.divide(new BigDecimal(v),BIGDECIMAL)
    def bool2int( a:Boolean ) = if (a) 1; else 0
    def autocorr( s:String ) =
    {
      for( d <- 0 until s.length-1 )
        yield
        ( ( 0 until s.length-d )
          .map( i => bool2int(s.charAt(i) equals s.charAt(i+d)) )
          .reduceLeft(_+_) ) / (s.length-d).toDouble
    }
    def cycleLength( v:BigDecimal ) = 
    {
      val seq = autocorr( v.toString.substring(2) )
      if ( seq.length==0 )
        0
      else
      {    
        val seq2 = seq.tail
        if ( seq2.length==0 )
          0
        else
          ( NumberUtils argMax seq2 ) + 1
      }
    }
    
    ( for( d <- 2 until 1000 )
      yield "%d: %d".format( d, cycleLength( reciprocal(d) ) ) )
      .mkString("\n")
  }

} 

//设置package包名称以及导入依赖的类
package movio.cinema.test

import org.scalacheck.Arbitrary
import org.scalacheck.Gen

trait DateTimeArbitrary {
  import org.joda.time._

  implicit val arbLocalDateTime: Arbitrary[LocalDateTime] =
    Arbitrary(Gen.posNum[Long] map (new LocalDateTime(_)))

  implicit val arbDateTime: Arbitrary[DateTime] =
    Arbitrary(Gen.posNum[Long] map (new DateTime(_)))
}

trait PlayJsonArbitrary {
  import java.math.BigDecimal
  import play.api.libs.json._
  import Arbitrary.arbitrary
  import Gen._

  implicit val arbJsonObject: Arbitrary[JsObject] = Arbitrary(jsonObjectNode)
  implicit val arbJsonArray: Arbitrary[JsArray] = Arbitrary(jsonArrayNode)

  lazy val shortText: Gen[String] =
    for {
      n ? choose(0, 4)
      chars ? listOfN(n, alphaNumChar)
    } yield chars.mkString

  lazy val jsonWholeNumberNode: Gen[JsNumber] = arbitrary[Long] map (n ? JsNumber(new BigDecimal(n)))
  lazy val jsonDecimalNumberNode: Gen[JsNumber]  = arbitrary[Double] map (n ? JsNumber(new BigDecimal(n)))

  lazy val jsonNumberNode: Gen[JsNumber] = oneOf(jsonWholeNumberNode, jsonDecimalNumberNode)
  lazy val jsonStringNode: Gen[JsString] = shortText map JsString.apply
  lazy val jsonBoolNode: Gen[JsBoolean] = oneOf(true, false) map JsBoolean.apply
  lazy val jsonNullNode: Gen[JsNull.type] = const(JsNull)

  lazy val jsonValueNode: Gen[JsValue] =
    oneOf(jsonNumberNode, jsonStringNode, jsonBoolNode, jsonNullNode, jsonArrayNode, jsonObjectNode)

  lazy val jsonArrayNode: Gen[JsArray] =
    for {
      n ? choose(1, 4)
      values ? listOfN(n, jsonValueNode)
    } yield JsArray(values)

  lazy val jsonObjectNode: Gen[JsObject] =
    for {
      n ? choose(1, 4)
      keys ? listOfN(n, shortText)
      values ? listOfN(n, jsonValueNode)
    } yield JsObject(keys zip values)
}

object StandardArbitraries extends DateTimeArbitrary with PlayJsonArbitrary 

//设置package包名称以及导入依赖的类
package com.sky.kafka.utils

import java.math.BigDecimal
import java.util.Properties

import common.BaseSpec

class MapToJavaPropertiesConversionSpec extends BaseSpec {

  "mapToProperties" should "convert objects into their string representation" in {
    val x = new Properties
    MapToJavaPropertiesConversion.mapToProperties(Map[String, Object](
      "object" -> new BigDecimal("123.456")
    )) shouldBe new Properties {
      setProperty("object", "123.456")
    }
  }

  it should "convert classes into the full class name" in {
    val x = new Properties
    MapToJavaPropertiesConversion.mapToProperties(Map[String, Object](
      "class" -> classOf[Exception]
    )) shouldBe new Properties {
      setProperty("class", "java.lang.Exception")
    }
  }
} 

//设置package包名称以及导入依赖的类
package com.gaiam.gcsis.util

import java.math.BigDecimal
import scalaz.{Equal, Monoid}


object RichBigDecimal {

  implicit def bigDecimalOrdered(a: BigDecimal) = new Ordered[BigDecimal] {
    override def compare(that: BigDecimal): Int = a.compareTo(that)
  }

  implicit object BigDecimalNumeric extends scala.math.Numeric[BigDecimal] with Ordering[BigDecimal] with Monoid[BigDecimal] with Equal[BigDecimal] {
    override def compare(o1: BigDecimal, o2: BigDecimal) = o1.compareTo(o2)
    override def plus(x: BigDecimal, y: BigDecimal) = x.add(y)
    override def minus(x: BigDecimal, y: BigDecimal) = x.subtract(y)
    override def times(x: BigDecimal, y: BigDecimal) = x.multiply(y)
    override def negate(x: BigDecimal) = x.negate
    override def fromInt(x: Int) = new BigDecimal(x)
    override def toInt(x: BigDecimal) = x.intValue
    override def toLong(x: BigDecimal) = x.longValue
    override def toFloat(x: BigDecimal) = x.floatValue
    override def toDouble(x: BigDecimal) = x.doubleValue
    override val one = BigDecimal.ONE
    override val zero = BigDecimal.ZERO
    override def append(x: BigDecimal, y: => BigDecimal) = x.add(y)
    override def equal(a: BigDecimal, b: BigDecimal) = a.compareTo(b) == 0
  }

} 

//设置package包名称以及导入依赖的类
import java.math.BigDecimal

object KMScalaKit {

  def bigDemicalDoubleAdd(number1: Double, number2: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val sum: Double =  a.add(b).doubleValue();

    return  sum;
  }

  def bigDemicalDoubleAdd(number1: Double, number2: Double, number3: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val c: BigDecimal = new BigDecimal(number3.toString);
    val sum: Double =  a.add(b).add(c).doubleValue();

    return  sum;
  }

  def bigDemicalDoubleSub(number1: Double, number2: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val res: Double =  a.subtract(b).doubleValue();

    return  res;
  }

  def bigDemicalDoubleMul(number1: Double, number2: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val res: Double = a.multiply(b).doubleValue();

    return res;
  }

  def bigDemicalDoubleMul(number1: Double, number2: Double, number3: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val c: BigDecimal = new BigDecimal(number2.toString);
    val res: Double = a.multiply(b).multiply(c).doubleValue();

    return res;
  }

  def bigDemicalDoubleDiv(number1: Double, number2: Double): Double = {
    val a: BigDecimal = new BigDecimal(number1.toString);
    val b: BigDecimal = new BigDecimal(number2.toString);
    val res: Double =  a.divide(b).doubleValue();

    return  res;
  }
}