Scala Library
scala

class AnyRef
[Source: none]
class AnyRef
extends Any

Class AnyRef is the root class of all reference types.

Method Summary
final def != (arg0 : AnyRef) : Boolean
final def == (arg0 : AnyRef) : Boolean
o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).
protected def clone : AnyRef
This method creates and returns a copy of the receiver object.
final def eq (arg0 : AnyRef) : Boolean
This method is used to test whether the argument (arg0) is a reference to the receiver object (this).
def equals (arg0 : Any) : Boolean
This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.
protected def finalize : Unit
This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.
final def getClass : java.lang.Class[Any]
Returns a representation that corresponds to the dynamic class of the receiver object.
def hashCode : Int
Returns a hash code value for the object.
final def ne (arg0 : AnyRef) : Boolean
o.ne(arg0) is the same as !(o.eq(arg0)).
final def notify : Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
final def notifyAll : Unit
Wakes up all threads that are waiting on the receiver object's monitor.
final def synchronized [T0](arg0 : T0) : T0
def toString : java.lang.String
Returns a string representation of the object.
final def wait : Unit
final def wait (arg0 : Long, arg1 : Int) : Unit
final def wait (arg0 : Long) : Unit
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Method Details
final def getClass : java.lang.Class[Any]
Returns a representation that corresponds to the dynamic class of the receiver object.

The nature of the representation is platform dependent.

Returns
a representation that corresponds to the dynamic class of the receiver object.

def hashCode : Int
Returns a hash code value for the object.

The default hashing algorithm is platform dependent. Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

Returns
the hash code value for the object.

Overrides
Any.hashCode
def equals(arg0 : Any) : Boolean
This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

The default implementations of this method is an equivalence relation:

  • It is reflexive: for any instance x of type Any, x.equals(x) should return true.
  • It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any instances x, y, and z of type AnyRef if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override hashCode to ensure that objects that are "equal" (o1.equals(o2) returns true) hash to the same Int (o1.hashCode.equals(o2.hashCode)).

Parameters
arg0 - the object to compare against this object for equality.
Returns
true if the receiver object is equivalent to the argument; false otherwise.

Overrides
Any.equals
protected def clone : AnyRef
This method creates and returns a copy of the receiver object.

The default implementation of the clone method is platform dependent.

Returns
a copy of the receiver object.

def toString : java.lang.String
Returns a string representation of the object.

The default representation is platform dependent.

Returns
a string representation of the object.

Overrides
Any.toString
final def notify : Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
final def notifyAll : Unit
Wakes up all threads that are waiting on the receiver object's monitor.
final def wait(arg0 : Long) : Unit
final def wait(arg0 : Long, arg1 : Int) : Unit
final def wait : Unit
protected def finalize : Unit
This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

The details of when and if the finalize method are invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

final def ==(arg0 : AnyRef) : Boolean
o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).

Parameters
arg0 - the object to compare against this object for equality.
Returns
true if the receiver object is equivalent to the argument; false otherwise.

final def !=(arg0 : AnyRef) : Boolean
final def eq(arg0 : AnyRef) : Boolean
This method is used to test whether the argument (arg0) is a reference to the receiver object (this).

The eq method implements an equivalence relation on non-null instances of AnyRef:

  • It is reflexive: for any non-null instance x of type AnyRef, x.eq(x) returns true.
  • It is symmetric: for any non-null instances x and y of type AnyRef, x.eq(y) returns true if and only if y.eq(x) returns true.
  • It is transitive: for any non-null instances x, y, and z of type AnyRef if x.eq(y) returns true and y.eq(z) returns true, then x.eq(z) returns true.
Additionally, the eq method has three other 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).

Parameters
arg0 - the object to compare against this object for reference equality.
Returns
true if the argument is a reference to the receiver object; false otherwise.

final def ne(arg0 : AnyRef) : Boolean
o.ne(arg0) is the same as !(o.eq(arg0)).

Parameters
arg0 - the object to compare against this object for reference dis-equality.
Returns
false if the argument is not a reference to the receiver object; true otherwise.

final def synchronized[T0](arg0 : T0) : T0
Scala Library