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/Scala 2.12 Library

Object scala.io.StdIn

object StdIn extends StdIn

Source
StdIn.scala
Linear Supertypes

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 type T0.

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.

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

not specified by SLS as a member of AnyRef

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.

Definition Classes
AnyRef → Any
Annotations
@native()

def hashCode(): Int

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()

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 type T0; 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

Definition Classes
AnyRef
Annotations
@throws( ... ) @native()

© 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