object StdIn extends StdIn
- Source
- StdIn.scala
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- def readBoolean(): Boolean
Reads a boolean value from an entire line of the default input.
Reads a boolean value from an entire line of the default input. Has a fairly liberal interpretation of the input.
- returns
the boolean value read, or false if it couldn't be converted to a boolean
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.
- def readByte(): Byte
Reads a byte value from an entire line of the default input.
Reads a byte value from an entire line of the default input.
- returns
the Byte that was read
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to a Byte
- def readChar(): Char
Reads a char value from an entire line of the default input.
Reads a char value from an entire line of the default input.
- returns
the Char that was read
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.StringIndexOutOfBoundsException
if the line read from default input was empty
- def readDouble(): Double
Reads a double value from an entire line of the default input.
Reads a double value from an entire line of the default input.
- returns
the Double that was read.
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to a Float
- def readFloat(): Float
Reads a float value from an entire line of the default input.
Reads a float value from an entire line of the default input.
- returns
the Float that was read.
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to a Float
- def readInt(): Int
Reads an int value from an entire line of the default input.
Reads an int value from an entire line of the default input.
- returns
the Int that was read
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to an Int
- def readLine(text: String, args: Any*): String
Print and flush formatted text to the default output, and read a full line from the default input.
Print and flush formatted text to the default output, and read a full line from the default input. Returns
null
if the end of the input stream has been reached.- text
the format of the text to print out, as in
printf
.- args
the parameters used to instantiate the format, as in
printf
.- returns
the string read from the default input
- Definition Classes
- StdIn
- def readLine(): String
Read a full line from the default input.
Read a full line from the default input. Returns
null
if the end of the input stream has been reached.- returns
the string read from the terminal or null if the end of stream was reached.
- Definition Classes
- StdIn
- def readLong(): Long
Reads an long value from an entire line of the default input.
Reads an long value from an entire line of the default input.
- returns
the Long that was read
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to a Long
- def readShort(): Short
Reads a short value from an entire line of the default input.
Reads a short value from an entire line of the default input.
- returns
the short that was read
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.java.lang.NumberFormatException
if the value couldn't be converted to a Short
- def readf(format: String): List[Any]
Reads in some structured input (from the default input), specified by a format specifier.
Reads in some structured input (from the default input), specified by a format specifier. See class
java.text.MessageFormat
for details of the format specification.- format
the format of the input.
- returns
a list of all extracted values.
- Definition Classes
- StdIn
- Exceptions thrown
java.io.EOFException
if the end of the input stream has been reached.
- def readf1(format: String): Any
Reads in some structured input (from the default input), specified by a format specifier, returning only the first value extracted, according to the format specification.
Reads in some structured input (from the default input), specified by a format specifier, returning only the first value extracted, according to the format specification.
- format
format string, as accepted by
readf
.- returns
The first value that was extracted from the input
- Definition Classes
- StdIn
- def readf2(format: String): (Any, Any)
Reads in some structured input (from the default input), specified by a format specifier, returning only the first two values extracted, according to the format specification.
Reads in some structured input (from the default input), specified by a format specifier, returning only the first two values extracted, according to the format specification.
- format
format string, as accepted by
readf
.- returns
A scala.Tuple2 containing the first two values extracted
- Definition Classes
- StdIn
- def readf3(format: String): (Any, Any, Any)
Reads in some structured input (from the default input), specified by a format specifier, returning only the first three values extracted, according to the format specification.
Reads in some structured input (from the default input), specified by a format specifier, returning only the first three values extracted, according to the format specification.
- format
format string, as accepted by
readf
.- returns
A scala.Tuple3 containing the first three values extracted
- Definition Classes
- StdIn
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
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 frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther 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.collection.parallel
- Parallel collections (scala-parallel-collections.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.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 forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.