Object scala.io.StdIn
object StdIn extends StdIn
- Source
- StdIn.scala
Value Members
final def !=(arg0: Any): Boolean
Test two objects for inequality.
- returns
true
if !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
final def ##(): Int
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
final def ==(arg0: Any): Boolean
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
final def asInstanceOf[T0]: 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 typeT0
.
def clone(): AnyRef
Create a copy of the receiver object.
The default implementation of the clone
method is platform dependent.
- returns
a copy of the receiver object.
final def eq(arg0: AnyRef): Boolean
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
def equals(arg0: Any): Boolean
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
def finalize(): Unit
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
final def getClass(): Class[_]
Returns the runtime class representation of the object.
- returns
a class object corresponding to the runtime type of the receiver.
def hashCode(): Int
The hashCode method for reference types. See hashCode in scala.Any.
- returns
the hash code value for this object.
final def isInstanceOf[T0]: Boolean
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 typeT0
;false
otherwise.
- Definition Classes
- Any
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that)
.
- returns
true
if the argument is not a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
final def notify(): Unit
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
final def notifyAll(): Unit
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
def readBoolean(): Boolean
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.
- 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.
- 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.
- 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.
- 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.
- 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. 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. 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.
- 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.
- 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. 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.
- 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.
- 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.
- format
format string, as accepted by
readf
.- returns
A scala.Tuple3 containing the first three values extracted
- Definition Classes
- StdIn
final def synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
def toString(): String
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
final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long): Unit
© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.12.9/scala/io/StdIn$.html