Test two objects for inequality.
true
if !(this == that), false otherwise.
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
.
a hash value consistent with ==
The expression x == that
is equivalent to if (x eq null) that eq null else x.equals(that)
.
true
if the receiver object is equivalent to the argument; false
otherwise.
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.
the receiver object.
ClassCastException
if the receiver object is not an instance of the erasure of type T0
.
Converts a Scala mutable concurrent.Map
to a Java ConcurrentMap
.
The returned Java ConcurrentMap
is backed by the provided Scala concurrent.Map
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala concurrent.Map
was previously obtained from an implicit or explicit call of asScala
then the original Java ConcurrentMap
will be returned.
The Scala concurrent.Map
to be converted.
A Java ConcurrentMap
view of the argument.
Converts a Scala Map
to a Java Map
.
The returned Java Map
is backed by the provided Scala Map
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Map
was previously obtained from an implicit or explicit call of asScala
then the original Java Map
will be returned.
The Scala Map
to be converted.
A Java Map
view of the argument.
Converts a Scala mutable Map
to a Java Map
.
The returned Java Map
is backed by the provided Scala Map
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Map
was previously obtained from an implicit or explicit call of asScala
then the original Java Map
will be returned.
The Scala mutable Map
to be converted.
A Java Map
view of the argument.
Converts a Scala Set
to a Java Set
.
The returned Java Set
is backed by the provided Scala Set
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Set
was previously obtained from an implicit or explicit call of asScala
then the original Java Set
will be returned.
The Scala Set
to be converted.
A Java Set
view of the argument.
Converts a Scala mutable Set
to a Java Set
.
The returned Java Set
is backed by the provided Scala Set
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Set
was previously obtained from an implicit or explicit call of asScala
then the original Java Set
will be returned.
The Scala mutable Set
to be converted.
A Java Set
view of the argument.
Converts a Scala Seq
to a Java List
.
The returned Java List
is backed by the provided Scala Seq
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Seq
was previously obtained from an implicit or explicit call of asScala
then the original Java List
will be returned.
The Scala Seq
to be converted.
A Java List
view of the argument.
Converts a Scala mutable Seq
to a Java List
.
The returned Java List
is backed by the provided Scala Seq
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Seq
was previously obtained from an implicit or explicit call of asScala
then the original Java List
will be returned.
The Scala Seq
to be converted.
A Java List
view of the argument.
Converts a Scala mutable Buffer
to a Java List.
The returned Java List is backed by the provided Scala Buffer
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Buffer
was previously obtained from an implicit or explicit call of asScala
then the original Java List
will be returned.
The Scala Buffer
to be converted.
A Java List
view of the argument.
Converts a Scala Iterable
to a Java Iterable
.
The returned Java Iterable
is backed by the provided Scala Iterable
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Iterable
was previously obtained from an implicit or explicit call of asScala
then the original Java Iterable
will be returned.
The Scala Iterable
to be converted.
A Java Iterable
view of the argument.
Converts a Scala Iterator
to a Java Iterator
.
The returned Java Iterator
is backed by the provided Scala Iterator
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Iterator
was previously obtained from an implicit or explicit call of asScala
then the original Java Iterator
will be returned.
The Scala Iterator
to be converted.
A Java Iterator
view of the argument.
Converts a Scala Iterable
to an immutable Java Collection
.
If the Scala Iterable
was previously obtained from an implicit or explicit call of asScala
then the original Java Collection
will be returned.
The Scala Iterable
to be converted.
A Java Collection
view of the argument.
Converts a Scala mutable Map
to a Java Dictionary
.
The returned Java Dictionary
is backed by the provided Scala Dictionary
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Map
was previously obtained from an implicit or explicit call of asScala
then the original Java Dictionary
will be returned.
The Scala Map
to be converted.
A Java Dictionary
view of the argument.
Converts a Scala Iterator
to a Java Enumeration
.
The returned Java Enumeration
is backed by the provided Scala Iterator
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
If the Scala Iterator
was previously obtained from an implicit or explicit call of asScala
then the original Java Enumeration
will be returned.
The Scala Iterator
to be converted.
A Java Enumeration
view of the argument.
Converts a Java Properties
to a Scala mutable Map[String, String]
.
The returned Scala Map[String, String]
is backed by the provided Java Properties
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
The Java Properties
to be converted.
A Scala mutable Map[String, String]
view of the argument.
Converts a Java Dictionary
to a Scala mutable Map
.
The returned Scala Map
is backed by the provided Java Dictionary
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Dictionary
was previously obtained from an implicit or explicit call of asJavaDictionary
then the original Scala Map
will be returned.
The Java Dictionary
to be converted.
A Scala mutable Map
view of the argument.
Converts a Java ConcurrentMap
to a Scala mutable ConcurrentMap
.
The returned Scala ConcurrentMap
is backed by the provided Java ConcurrentMap
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java ConcurrentMap
was previously obtained from an implicit or explicit call of asJava
then the original Scala ConcurrentMap
will be returned.
The Java ConcurrentMap
to be converted.
A Scala mutable ConcurrentMap
view of the argument.
Converts a Java Map
to a Scala mutable Map
.
The returned Scala Map
is backed by the provided Java Map
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Map
was previously obtained from an implicit or explicit call of asJava
then the original Scala Map
will be returned.
If the wrapped map is synchronized (e.g. from java.util.Collections.synchronizedMap
), it is your responsibility to wrap all non-atomic operations with underlying.synchronized
. This includes get
, as java.util.Map
's API does not allow for an atomic get
when null
values may be present.
The Java Map
to be converted.
A Scala mutable Map
view of the argument.
Converts a Java Set
to a Scala mutable Set
.
The returned Scala Set
is backed by the provided Java Set
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Set
was previously obtained from an implicit or explicit call of asJava
then the original Scala Set
will be returned.
The Java Set
to be converted.
A Scala mutable Set
view of the argument.
Converts a Java List
to a Scala mutable Buffer
.
The returned Scala Buffer
is backed by the provided Java List
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java List
was previously obtained from an implicit or explicit call of asJava
then the original Scala Buffer
will be returned.
The Java List
to be converted.
A Scala mutable Buffer
view of the argument.
Converts a Java Collection
to a Scala Iterable
.
If the Java Collection
was previously obtained from an implicit or explicit call of asJavaCollection
then the original Scala Iterable
will be returned.
The Java Collection
to be converted.
A Scala Iterable
view of the argument.
Converts a Java Iterable
to a Scala Iterable
.
The returned Scala Iterable
is backed by the provided Java Iterable
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Iterable
was previously obtained from an implicit or explicit call of asJava
then the original Scala Iterable
will be returned.
The Java Iterable
to be converted.
A Scala Iterable
view of the argument.
Converts a Java Enumeration
to a Scala Iterator
.
The returned Scala Iterator
is backed by the provided Java Enumeration
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Enumeration
was previously obtained from an implicit or explicit call of asJavaEnumeration
then the original Scala Iterator
will be returned.
The Java Enumeration
to be converted.
A Scala Iterator
view of the argument.
Converts a Java Iterator
to a Scala Iterator
.
The returned Scala Iterator
is backed by the provided Java Iterator
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
If the Java Iterator
was previously obtained from an implicit or explicit call of asJava
then the original Scala Iterator
will be returned.
The Java Iterator
to be converted.
A Scala Iterator
view of the argument.
Create a copy of the receiver object.
The default implementation of the clone
method is platform dependent.
a copy of the receiver object.
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:
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
).
true
if the argument is a reference to the receiver object; false
otherwise.
The equality method for reference types. Default implementation delegates to eq
.
See also equals
in scala.Any.
true
if the receiver object is equivalent to the argument; false
otherwise.
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.
Returns the runtime class representation of the object.
a class object corresponding to the runtime type of the receiver.
The hashCode method for reference types. See hashCode in scala.Any.
the hash code value for this object.
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.
true
if the receiver object is an instance of erasure of type T0
; false
otherwise.
Equivalent to !(this eq that)
.
true
if the argument is not a reference to the receiver object; false
otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Wakes up all threads that are waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
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.
a String representation of the object.
© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.13.0/scala/jdk/javaapi/CollectionConverters$.html
This object contains methods that convert between Scala and Java collections.
The explicit conversion methods defined here are intended to be used in Java code. For Scala code, it is recommended to use the extension methods defined in scala.jdk.CollectionConverters.
Note: to create Java Streams that operate on Scala collections (sequentially or in parallel), use StreamConverters.
The conversions return adapters for the corresponding API, i.e., the collections are wrapped, not converted. Changes to the original collection are reflected in the view, and vice versa.
The following conversions are supported via
asScala
andasJava
:The following conversions are supported via
asScala
and through specially-named methods to convert to Java collections, as shown:In addition, the following one-way conversions are provided via
asJava
:The following one way conversion is provided via
asScala
:In all cases, converting from a source type to a target type and back again will return the original source object.