object Using
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- Using.scala
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- final def !=(arg0: Any): Boolean
Test two objects for inequality.
Test two objects for inequality.
- returns
trueif !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
- final def ##(): Int
Equivalent to
x.hashCodeexcept for boxed numeric types andnull.Equivalent to
x.hashCodeexcept for boxed numeric types andnull. 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. Fornullreturns a hashcode wherenull.hashCodethrows aNullPointerException.- returns
a hash value consistent with ==
- Definition Classes
- AnyRef → Any
- final def ==(arg0: Any): Boolean
The expression
x == thatis equivalent toif (x eq null) that eq null else x.equals(that).The expression
x == thatis equivalent toif (x eq null) that eq null else x.equals(that).- returns
trueif the receiver object is equivalent to the argument;falseotherwise.
- Definition Classes
- AnyRef → Any
- def apply[R](resource: ⇒ R): Using[R]
Creates a
Usingfrom the given resource.Creates a
Usingfrom the given resource.- Note
If the resource does not have an implicit Resource in scope, the returned
Usingwill be useless.
- final def asInstanceOf[T0]: T0
Cast the receiver object to be of type
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 aClassCastExceptionat runtime, while the expressionList(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
ClassCastExceptionif the receiver object is not an instance of the erasure of typeT0.
- def clone(): AnyRef
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the
clonemethod 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).Tests whether the argument (
that) is a reference to the receiver object (this).The
eqmethod implements an equivalence relation on non-null instances ofAnyRef, and has three additional properties:- It is consistent: for any non-null instances
xandyof typeAnyRef, multiple invocations ofx.eq(y)consistently returnstrueor consistently returnsfalse. - For any non-null instance
xof typeAnyRef,x.eq(null)andnull.eq(x)returnsfalse. null.eq(null)returnstrue.
When overriding the
equalsorhashCodemethods, 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
trueif the argument is a reference to the receiver object;falseotherwise.
- Definition Classes
- AnyRef
- It is consistent: for any non-null instances
- def equals(arg0: Any): Boolean
The equality method for reference types.
- def finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
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
finalizemethod is invoked, as well as the interaction betweenfinalizeand non-local returns and exceptions, are all platform dependent. - final def getClass(): Class[_]
Returns the runtime class representation of the object.
- def hashCode(): Int
The hashCode method for reference types.
- final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is
T0.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 returnfalse, while the expressionList(1).isInstanceOf[List[String]]will returntrue. 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
trueif the receiver object is an instance of erasure of typeT0;falseotherwise.
- Definition Classes
- Any
- final def ne(arg0: AnyRef): Boolean
Equivalent to
!(this eq that).Equivalent to
!(this eq that).- returns
trueif the argument is not a reference to the receiver object;falseotherwise.
- Definition Classes
- AnyRef
- final def notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
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.
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 resource[R, A](resource: R)(body: (R) ⇒ A)(implicit arg0: Resource[R]): A
Performs an operation using a resource, and then releases the resource, even if the operation throws an exception.
Performs an operation using a resource, and then releases the resource, even if the operation throws an exception. This method behaves similarly to Java's try-with-resources.
It is highly recommended to use the
Usingconstruct, which safely wraps resource usage and management in aTry.If both the operation and releasing the resource throw exceptions, the one thrown when releasing the resource is added as a suppressed exception to the one thrown by the operation, unless the exception thrown when releasing the resource is fatal, and the one thrown by the operation is not. In that case, the exception thrown by the operation is added as a suppressed exception to the one thrown when releasing the resource. If an exception is a ControlThrowable, no exception will be added to it as a suppressed exception.
- R
the type of the resource
- A
the return type of the operation
- resource
the resource
- body
the operation to perform with the resource
- returns
the result of the operation, if neither the operation nor releasing the resource throws
- def resources[R1, R2, R3, R4, A](resource1: R1, resource2: ⇒ R2, resource3: ⇒ R3, resource4: ⇒ R4)(body: (R1, R2, R3, R4) ⇒ A)(implicit arg0: Resource[R1], arg1: Resource[R2], arg2: Resource[R3], arg3: Resource[R4]): A
Performs an operation using four resources, and then releases the resources in reverse order, even if the operation throws an exception.
Performs an operation using four resources, and then releases the resources in reverse order, even if the operation throws an exception. This method behaves similarly to Java's try-with-resources.
It is highly recommended to use the
Usingconstruct, which safely wraps resource usage and management in aTry.If more than one exception is thrown by the operation and releasing resources, the exception thrown first is thrown, with the other exceptions added as suppressed exceptions to the one thrown first. This is the case unless a later exception is fatal, and the one preceding it is not. In that case, the first exception is added as a suppressed exception to the fatal one, and the fatal one is thrown. If an exception is a ControlThrowable, no exception will be added to it as a suppressed exception.
- R1
the type of the first resource
- R2
the type of the second resource
- R3
the type of the third resource
- R4
the type of the fourth resource
- A
the return type of the operation
- resource1
the first resource
- resource2
the second resource
- resource3
the third resource
- resource4
the fourth resource
- body
the operation to perform using the resources
- returns
the result of the operation, if neither the operation nor releasing the resources throws
- def resources[R1, R2, R3, A](resource1: R1, resource2: ⇒ R2, resource3: ⇒ R3)(body: (R1, R2, R3) ⇒ A)(implicit arg0: Resource[R1], arg1: Resource[R2], arg2: Resource[R3]): A
Performs an operation using three resources, and then releases the resources in reverse order, even if the operation throws an exception.
Performs an operation using three resources, and then releases the resources in reverse order, even if the operation throws an exception. This method behaves similarly to Java's try-with-resources.
It is highly recommended to use the
Usingconstruct, which safely wraps resource usage and management in aTry.If more than one exception is thrown by the operation and releasing resources, the exception thrown first is thrown, with the other exceptions added as suppressed exceptions to the one thrown first. This is the case unless a later exception is fatal, and the one preceding it is not. In that case, the first exception is added as a suppressed exception to the fatal one, and the fatal one is thrown. If an exception is a ControlThrowable, no exception will be added to it as a suppressed exception.
- R1
the type of the first resource
- R2
the type of the second resource
- R3
the type of the third resource
- A
the return type of the operation
- resource1
the first resource
- resource2
the second resource
- resource3
the third resource
- body
the operation to perform using the resources
- returns
the result of the operation, if neither the operation nor releasing the resources throws
- def resources[R1, R2, A](resource1: R1, resource2: ⇒ R2)(body: (R1, R2) ⇒ A)(implicit arg0: Resource[R1], arg1: Resource[R2]): A
Performs an operation using two resources, and then releases the resources in reverse order, even if the operation throws an exception.
Performs an operation using two resources, and then releases the resources in reverse order, even if the operation throws an exception. This method behaves similarly to Java's try-with-resources.
It is highly recommended to use the
Usingconstruct, which safely wraps resource usage and management in aTry.If more than one exception is thrown by the operation and releasing resources, the exception thrown first is thrown, with the other exceptions added as suppressed exceptions to the one thrown first. This is the case unless a later exception is fatal, and the one preceding it is not. In that case, the first exception is added as a suppressed exception to the fatal one, and the fatal one is thrown. If an exception is a ControlThrowable, no exception will be added to it as a suppressed exception.
- R1
the type of the first resource
- R2
the type of the second resource
- A
the return type of the operation
- resource1
the first resource
- resource2
the second resource
- body
the operation to perform using the resources
- returns
the result of the operation, if neither the operation nor releasing the resources throws
- final def synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
- def toString(): String
Creates a String representation of this object.
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(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- object Resource
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int,Float,ArrayorOptionwhich are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collectionand its sub-packages contain Scala's collections frameworkscala.collection.immutable- Immutable, sequential data-structures such asVector,List,Range,HashMaporHashSetscala.collection.mutable- Mutable, sequential data-structures such asArrayBuffer,StringBuilder,HashMaporHashSetscala.collection.concurrent- Mutable, concurrent data-structures such asTrieMapscala.concurrent- Primitives for concurrent programming such asFuturesandPromisesscala.io- Input and output operationsscala.math- Basic math functions and additional numeric types likeBigIntandBigDecimalscala.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.Predefobject are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
Listis an alias forscala.collection.immutable.List.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
Stringis an alias forjava.lang.String.