Object scala.compat.Platform
object Platform
- Source
- Platform.scala
Type Members
type ConcurrentModificationException = java.util.ConcurrentModificationException
This is a type alias for java.util.ConcurrentModificationException
, which may be thrown by methods that detect an invalid modification of an object. For example, many common collection types do not allow modifying a collection while it is being iterated over.
type StackOverflowError = java.lang.StackOverflowError
Thrown when a stack overflow occurs because a method or function recurses too deeply.
On the JVM, this is a type alias for java.lang.StackOverflowError
, which itself extends java.lang.Error
. The same rules apply to catching a java.lang.Error
as for Java, that it indicates a serious problem that a reasonable application should not try and catch.
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
val EOL: String
The default line separator.
On the JVM, this is equivalent to calling the method: java.lang.System.lineSeparator
def arrayclear(arr: Array[Int]): Unit
Assigns the value of 0 to each element in the array.
- arr
A non-null Array[Int].
- Annotations
- @inline()
- Exceptions thrown
java.lang.NullPointerException
Ifarr
isnull
.
def arraycopy(src: AnyRef, srcPos: Int, dest: AnyRef, destPos: Int, length: Int): Unit
Copies length
elements of array src
starting at position srcPos
to the array dest
starting at position destPos
. If src
==dest
, the copying will behave as if the elements copied from src
were first copied to a temporary array before being copied back into the array at the destination positions.
- src
A non-null array as source for the copy.
- srcPos
The starting index in the source array.
- dest
A non-null array as destination for the copy.
- destPos
The starting index in the destination array.
- length
The number of elements to be copied.
- Annotations
- @inline()
- Exceptions thrown
-
java.lang.ArrayStoreException
If eithersrc
ordest
are not of type [java.lang.Array]; or if the element type ofsrc
is not compatible with that ofdest
.java.lang.IndexOutOfBoundsException
If eithersrcPos
ordestPos
are outside of the bounds of their respective arrays; or iflength
is negative; or if there are less thanlength
elements available aftersrcPos
ordestPos
insrc
anddest
respectively.java.lang.NullPointerException
If eithersrc
ordest
arenull
.
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.
def collectGarbage(): Unit
Runs the garbage collector.
This is a request that the underlying JVM runs the garbage collector. The results of this call depends heavily on the JVM used. The underlying JVM is free to ignore this request.
- Annotations
- @inline()
def createArray(elemClass: Class[_], length: Int): AnyRef
Creates a new array of the specified type and given length.
Note that if elemClass
is a subclass of scala.AnyVal then the returned value is an Array of the corresponding java primitive type. For example, the following code scala.compat.Platform.createArray(classOf[Int], 4)
returns an array of the java primitive type int
.
For a scala.AnyVal array, the values of the array are set to 0 for numeric value types (scala.Double, scala.Float, scala.Long, scala.Int, scala.Char, scala.Short, and scala.Byte), and false
for scala.Boolean. Creation of an array of type scala.Unit is not possible.
For subclasses of scala.AnyRef, the values of the array are set to null
.
The caller must cast the returned value to the correct type.
- elemClass
the
Class
object of the component type of the array- length
the length of the new array.
- returns
an array of the given component type as an
AnyRef
.
- Annotations
- @inline()
- Exceptions thrown
-
java.lang.IllegalArgumentException
if componentType is scala.Unit orjava.lang.Void.TYPE
java.lang.NegativeArraySizeException
if the specified length is negativejava.lang.NullPointerException
IfelemClass
isnull
.
val a = scala.compat.Platform.createArray(classOf[Int], 4).asInstanceOf[Array[Int]] // returns Array[Int](0, 0, 0, 0)
def currentTime: Long
The current time in milliseconds. The time is counted since 1 January 1970 UTC.
Note that the operating system timer used to obtain this value may be less precise than a millisecond.
- Annotations
- @inline()
def defaultCharsetName: String
The name of the default character set encoding as a string
- Annotations
- @inline()
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 getClassForName(name: String): Class[_]
Returns the Class
object associated with the class or interface with the given string name using the current ClassLoader
. On the JVM, invoking this method is equivalent to: java.lang.Class.forName(name)
For more information, please see the Java documentation for java.lang.Class.
- name
the fully qualified name of the desired class.
- returns
the
Class
object for the class with the specified name.
- Annotations
- @inline()
- Exceptions thrown
-
java.lang.ClassNotFoundException
if the class cannot be locatedjava.lang.ExceptionInInitializerError
if the initialization provoked by this method failsjava.lang.LinkageError
if the linkage fails
val a = scala.compat.Platform.getClassForName("java.lang.Integer") // returns the Class[_] for java.lang.Integer
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
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/compat/Platform$.html