Scala Standard Library2.12.21 < Back
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# Packages

-  package root

  This is the documentation for the Scala standard library.

  This is the documentation for the Scala standard library.

  #### Package structure

  The scala package contains core types like `Int`, `Float`, `Array` or `Option` which are accessible in all Scala compilation units without explicit qualification or imports.

  Notable packages include:

  - `scala.collection` and its sub-packages contain Scala's collections framework
    - `scala.collection.immutable` - Immutable, sequential data-structures such as `Vector`, `List`, `Range`, `HashMap` or `HashSet`
    - `scala.collection.mutable` - Mutable, sequential data-structures such as `ArrayBuffer`, `StringBuilder`, `HashMap` or `HashSet`
    - `scala.collection.concurrent` - Mutable, concurrent data-structures such as `TrieMap`
    - `scala.collection.parallel.immutable` - Immutable, parallel data-structures such as `ParVector`, `ParRange`, `ParHashMap` or `ParHashSet`
    - `scala.collection.parallel.mutable` - Mutable, parallel data-structures such as `ParArray`, `ParHashMap`, `ParTrieMap` or `ParHashSet`
  - `scala.concurrent` - Primitives for concurrent programming such as `Futures` and `Promises`
  - `scala.io` - Input and output operations
  - `scala.math` - Basic math functions and additional numeric types like `BigInt` and `BigDecimal`
  - `scala.sys` - Interaction with other processes and the operating system
  - `scala.util.matching` - Regular expressions

  Other packages exist. See the complete list on the right.

  Additional parts of the standard library are shipped as separate libraries. These include:

  - `scala.reflect` - Scala's reflection API (scala-reflect.jar)
  - `scala.xml` - XML parsing, manipulation, and serialization (scala-xml.jar)
  - `scala.swing` - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)
  - `scala.util.parsing` - Parser combinators (scala-parser-combinators.jar)

  #### Automatic imports

  Identifiers in the scala package and the `scala.Predef` object are always in scope by default.

  Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, `List` is an alias for `scala.collection.immutable.List`.

  Other aliases refer to classes provided by the underlying platform. For example, on the JVM, `String` is an alias for `java.lang.String`.

  Definition Classes
    root
-  package scala

  Core Scala types.

  Core Scala types. They are always available without an explicit import.

  Definition Classes
    root
-  package math

  The package object `scala.math` contains methods for performing basic numeric operations such as elementary exponential, logarithmic, root and trigonometric functions.

  The package object `scala.math` contains methods for performing basic numeric operations such as elementary exponential, logarithmic, root and trigonometric functions.

  All methods forward to java.lang.Math unless otherwise noted.

  Definition Classes
    scala
  See also

    java.lang.Math

- BigDecimal
- BigInt
- Equiv
- Fractional
- Integral
- LowPriorityEquiv
- LowPriorityOrderingImplicits
- Numeric
- Ordered
- Ordering
- PartialOrdering
- PartiallyOrdered
- ScalaNumericAnyConversions
- ScalaNumericConversions

o

scala.math

# BigDecimal 

###
Companion class BigDecimal

#### object BigDecimal extends Serializable

Source
  BigDecimal.scala
Since

  2.7

Linear Supertypes
Serializable, java.io.Serializable, AnyRef, Any
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Inherited

1. BigDecimal
2. Serializable
3. Serializable
4. AnyRef
5. Any

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Visibility

1. Public
2. All

### Value Members

1.  final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any
2.  final def ##(): Int

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any
3.  final def ==(arg0: Any): Boolean

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   Definition Classes
     AnyRef → Any
4.  def apply(bd: java.math.BigDecimal): BigDecimal

   Constructs a `BigDecimal` from a `java.math.BigDecimal`.

5.  def apply(unscaledVal: BigInt, scale: Int, mc: MathContext): BigDecimal

   Constructs a `BigDecimal` whose unscaled value is equal to that of the specified `BigInt` value.

   Constructs a `BigDecimal` whose unscaled value is equal to that of the specified `BigInt` value.

   unscaledVal

     the specified `BigInt` value

   scale

     the scale

   mc

     the precision and rounding mode for creation of this value and future operations on it

   returns

     the constructed `BigDecimal`

6.  def apply(unscaledVal: BigInt, scale: Int): BigDecimal

   Constructs a `BigDecimal` whose unscaled value is equal to that of the specified `BigInt` value.

   Constructs a `BigDecimal` whose unscaled value is equal to that of the specified `BigInt` value.

   unscaledVal

     the specified `BigInt` value

   scale

     the scale

   returns

     the constructed `BigDecimal`

7.  def apply(x: BigInt, mc: MathContext): BigDecimal

   Constructs a `BigDecimal` whose value is equal to that of the specified `BigInt` value, rounding if necessary.

   Constructs a `BigDecimal` whose value is equal to that of the specified `BigInt` value, rounding if necessary.

   x

     the specified `BigInt` value

   mc

     the precision and rounding mode for creation of this value and future operations on it

   returns

     the constructed `BigDecimal`

8.  def apply(x: BigInt): BigDecimal

   Constructs a `BigDecimal` whose value is equal to that of the specified `BigInt` value.

   Constructs a `BigDecimal` whose value is equal to that of the specified `BigInt` value.

   x

     the specified `BigInt` value

   returns

     the constructed `BigDecimal`

9.  def apply(x: String, mc: MathContext): BigDecimal

   Translates the decimal String representation of a `BigDecimal` into a `BigDecimal`, rounding if necessary.

10.  def apply(x: String): BigDecimal

    Translates the decimal String representation of a `BigDecimal` into a `BigDecimal`.

11.  def apply(x: Array[Char], mc: MathContext): BigDecimal

    Translates a character array representation of a `BigDecimal` into a `BigDecimal`, rounding if necessary.

12.  def apply(x: Array[Char]): BigDecimal

    Translates a character array representation of a `BigDecimal` into a `BigDecimal`.

13.  def apply(d: Double, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified double value, but rounded if necessary.

    Constructs a `BigDecimal` whose value is equal to that of the specified double value, but rounded if necessary. Equivalent to `BigDecimal.decimal`.

    d

      the specified `Double` value

    mc

      the precision and rounding mode for creation of this value and future operations on it

    returns

      the constructed `BigDecimal`

14.  def apply(d: Double): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified double value.

    Constructs a `BigDecimal` whose value is equal to that of the specified double value. Equivalent to `BigDecimal.decimal`.

    d

      the specified `Double` value

    returns

      the constructed `BigDecimal`

15.  def apply(unscaledVal: Long, scale: Int, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` whose unscaled value is equal to that of the specified long value, but rounded if necessary.

    Constructs a `BigDecimal` whose unscaled value is equal to that of the specified long value, but rounded if necessary.

    unscaledVal

      the value

    scale

      the scale

    mc

      the precision and rounding mode for creation of this value and future operations on it

    returns

      the constructed `BigDecimal`

16.  def apply(unscaledVal: Long, scale: Int): BigDecimal

    Constructs a `BigDecimal` whose unscaled value is equal to that of the specified long value.

    Constructs a `BigDecimal` whose unscaled value is equal to that of the specified long value.

    unscaledVal

      the value

    scale

      the scale

    returns

      the constructed `BigDecimal`

17.  def apply(l: Long, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified long value, but rounded if necessary.

    Constructs a `BigDecimal` whose value is equal to that of the specified long value, but rounded if necessary.

    l

      the specified long value

    mc

      the precision and rounding mode for creation of this value and future operations on it

    returns

      the constructed `BigDecimal`

18.  def apply(l: Long): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified long value.

    Constructs a `BigDecimal` whose value is equal to that of the specified long value.

    l

      the specified long value

    returns

      the constructed `BigDecimal`

19.  def apply(i: Int, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified `Integer` value, rounding if necessary.

    Constructs a `BigDecimal` whose value is equal to that of the specified `Integer` value, rounding if necessary.

    i

      the specified integer value

    mc

      the precision and rounding mode for creation of this value and future operations on it

    returns

      the constructed `BigDecimal`

20.  def apply(i: Int): BigDecimal

    Constructs a `BigDecimal` whose value is equal to that of the specified `Integer` value.

    Constructs a `BigDecimal` whose value is equal to that of the specified `Integer` value.

    i

      the specified integer value

    returns

      the constructed `BigDecimal`

21.  final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver object is not an instance of the erasure of type `T0`.

22.  def binary(d: Double): BigDecimal

    Constructs a `BigDecimal` by expanding the binary fraction contained by `Double` value `d` into a decimal representation.

    Constructs a `BigDecimal` by expanding the binary fraction contained by `Double` value `d` into a decimal representation. Note: this also works correctly on converted `Float`s.

23.  def binary(d: Double, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` by expanding the binary fraction contained by `Double` value `d` into a decimal representation, rounding if necessary.

    Constructs a `BigDecimal` by expanding the binary fraction contained by `Double` value `d` into a decimal representation, rounding if necessary. When a `Float` is converted to a `Double`, the binary fraction is preserved, so this method also works for converted `Float`s.

24.  def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( ... ) @native()
    Note

      not specified by SLS as a member of AnyRef

25.  def decimal(bd: java.math.BigDecimal, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` using a `java.math.BigDecimal`, rounding if necessary.

26.  def decimal(l: Long): BigDecimal

    Constructs a `BigDecimal` from a `Long`.

    Constructs a `BigDecimal` from a `Long`. This is identical to `BigDecimal(l)`.

27.  def decimal(l: Long, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` from a `Long`, rounding if necessary.

    Constructs a `BigDecimal` from a `Long`, rounding if necessary. This is identical to `BigDecimal(l, mc)`.

28.  def decimal(f: Float): BigDecimal

    Constructs a `BigDecimal` using the decimal text representation of `Float` value `f`.

    Constructs a `BigDecimal` using the decimal text representation of `Float` value `f`. Note that `BigDecimal.decimal(0.1f) != 0.1f` since equality agrees with the `Double` representation, and `0.1 != 0.1f`.

29.  def decimal(f: Float, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` using the decimal text representation of `Float` value `f`, rounding if necessary.

    Constructs a `BigDecimal` using the decimal text representation of `Float` value `f`, rounding if necessary. Note that `BigDecimal.decimal(0.1f) != 0.1f` since equality agrees with the `Double` representation, and `0.1 != 0.1f`.

30.  def decimal(d: Double): BigDecimal

    Constructs a `BigDecimal` using the decimal text representation of `Double` value `d`.

31.  def decimal(d: Double, mc: MathContext): BigDecimal

    Constructs a `BigDecimal` using the decimal text representation of `Double` value `d`, rounding if necessary.

32.  val defaultMathContext: MathContext
33.  implicit def double2bigDecimal(d: Double): BigDecimal

    Implicit conversion from `Double` to `BigDecimal`.

34.  final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
35.  def equals(arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any
36.  def exact(cs: Array[Char]): BigDecimal

    Constructs a `BigDecimal` that exactly represents the number specified in base 10 in a character array.

37.  def exact(s: String): BigDecimal

    Constructs a `BigDecimal` that exactly represents the number specified in a `String`.

38.  def exact(l: Long): BigDecimal

    Constructs a `BigDecimal` that exactly represents a `Long`.

    Constructs a `BigDecimal` that exactly represents a `Long`. Note that all creation methods for `BigDecimal` that do not take a `MathContext` represent a `Long`; this is equivalent to `apply`, `valueOf`, etc..

39.  def exact(bi: BigInt): BigDecimal

    Constructs a `BigDecimal` that exactly represents a `BigInt`.

40.  def exact(d: Double): BigDecimal

    Constructs a `BigDecimal` by fully expanding the binary fraction contained by `Double` value `d`, adjusting the precision as necessary.

    Constructs a `BigDecimal` by fully expanding the binary fraction contained by `Double` value `d`, adjusting the precision as necessary. Note: this works correctly on converted `Float`s also.

41.  def exact(repr: java.math.BigDecimal): BigDecimal

    Constructs a `BigDecimal` from a `java.math.BigDecimal`.

    Constructs a `BigDecimal` from a `java.math.BigDecimal`. The precision is the default for `BigDecimal` or enough to represent the `java.math.BigDecimal` exactly, whichever is greater.

42.  def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )
    Note

      not specified by SLS as a member of AnyRef

43.  final def getClass(): Class[_]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

      a class object corresponding to the runtime type of the receiver.

    Definition Classes
      AnyRef → Any
    Annotations
      @native()
44.  def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any
    Annotations
      @native()
45.  implicit def int2bigDecimal(i: Int): BigDecimal

    Implicit conversion from `Int` to `BigDecimal`.

46.  final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is `T0`.

    Test whether the dynamic type of the receiver object is `T0`.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any
47.  implicit def javaBigDecimal2bigDecimal(x: java.math.BigDecimal): BigDecimal

    Implicit conversion from `java.math.BigDecimal` to `scala.BigDecimal`.

48.  implicit def long2bigDecimal(l: Long): BigDecimal

    Implicit conversion from `Long` to `BigDecimal`.

49.  final def ne(arg0: AnyRef): Boolean

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
50.  final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

51.  final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

52.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
53.  def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

      a String representation of the object.

    Definition Classes
      AnyRef → Any
54.  def valueOf(x: Long): BigDecimal

    Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor.

    Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor.

    x

      the specified `Long` value

    returns

      the constructed `BigDecimal`

55.  def valueOf(d: Double): BigDecimal

    Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor.

    Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor. Equivalent to `BigDecimal.decimal`.

    d

      the specified double value

    returns

      the constructed `BigDecimal`

56.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
57.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
58.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... ) @native()
59.  object RoundingMode extends Enumeration

### Deprecated Value Members

1.  def apply(bd: java.math.BigDecimal, mc: MathContext): BigDecimal
   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) This method appears to round a java.math.BigDecimal but actually doesn't. Use new BigDecimal(bd, mc) instead for no rounding, or BigDecimal.decimal(bd, mc) for rounding.

2.  def apply(x: Float, mc: MathContext): BigDecimal
   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) The default conversion from Float may not do what you want. Use BigDecimal.decimal for a String representation, or explicitly convert the Float with .toDouble.

3.  def apply(x: Float): BigDecimal
   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) The default conversion from Float may not do what you want. Use BigDecimal.decimal for a String representation, or explicitly convert the Float with .toDouble.

4.  def valueOf(f: Float, mc: MathContext): BigDecimal

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor.

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor. This is unlikely to do what you want; use `valueOf(f.toDouble)` or `decimal(f)` instead.

   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) Float arguments to valueOf may not do what you wish. Use decimal or valueOf(f.toDouble).

5.  def valueOf(f: Float): BigDecimal

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor.

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor. This is unlikely to do what you want; use `valueOf(f.toDouble)` or `decimal(f)` instead.

   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) Float arguments to valueOf may not do what you wish. Use decimal or valueOf(f.toDouble).

6.  def valueOf(d: Double, mc: MathContext): BigDecimal

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor, specifying a `MathContext` that is used for computations but isn't used for rounding.

   Constructs a `BigDecimal` using the java BigDecimal static valueOf constructor, specifying a `MathContext` that is used for computations but isn't used for rounding. Use `BigDecimal.decimal` to use `MathContext` for rounding, or `BigDecimal(java.math.BigDecimal.valueOf(d), mc)` for no rounding.

   d

     the specified double value

   mc

     the `MathContext` used for future computations

   returns

     the constructed `BigDecimal`

   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) MathContext is not applied to Doubles in valueOf. Use BigDecimal.decimal to use rounding, or java.math.BigDecimal.valueOf to avoid it.

### Inherited from Serializable

### Inherited from java.io.Serializable

### Inherited from AnyRef

### Inherited from Any

### Ungrouped