The first element returned by the iterator, if any, or null if this stream is empty. For a stream with an unstable iteration order, a different value might be produced each time first is evaluated.

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

• if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

In general, hash values vary between platforms and between executions of the same program.

Note that when executing on a Java Virtual Machine, the 64-bit Integer value returned by an implementation of hash is truncated to a 32-bit integer value by taking the exclusive disjunction of the 32 lowest-order bits with the 32 highest-order bits, before returning the value to the caller.

The last element returned by the iterator, if any, or null if this stream is empty. In the case of an infinite stream, this operation never terminates; furthermore, this default implementation iterates all elements, which might be very expensive.

The number of elements returned by the iterator of this stream, if the iterator terminates. In the case of an infinite stream, this operation never terminates.

A developer-friendly string representing the instance. Concatenates the name of the concrete class of the instance with the hash of the instance. Subclasses are encouraged to refine this implementation to produce a more meaningful representation.

The entries with keys larger than or equal to the first given value, and smaller than or equal to the second given value, sorted in ascending order.

This is a lazy operation, returning a view of the underlying sorted map.

Remove every entry from this map, leaving an empty map with no entries.

A shallow copy of this collection, that is, a collection with identical elements which does not change if this collection changes. If this collection is immutable, it is acceptable to return a reference to this collection. If this collection is mutable, a newly instantiated collection must be returned.

Returns true if the given value belongs to this Category, that is, if it is an element of this Category, or false otherwise.

For any instance c of Category, c.contains(element) may be written using the in operator:

element in c

For most Categorys, the following relationship is satisfied by every pair of elements x and y:

• if x==y, then x in category == y in category

However, it is possible to form a useful Category consistent with some other equivalence relation, for example ===. Therefore implementations of contains() which do not satisfy this relationship are tolerated.

Determines if there is a value defined for the given key.

The entries with keys smaller than or equal to the first given value, and larger than or equal to the second given value, sorted in descending order.

This is a lazy operation, returning a view of the underlying sorted map.

Determine if two values are equal.

For any two non-null objects x and y, x.equals(y) may be written as:

x == y 

Implementations should respect the constraints that:

• if x===y then x==y (reflexivity),
• if x==y then y==x (symmetry),
• if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

Note that an implementation of equals() that always returns false does satisfy the constraints given above. Therefore, in very rare cases where there is no reasonable definition of value equality for a class, for example, function references (Callable), it is acceptable for equals() to be defined to return false for every argument.

Returns the value defined for the given key, or null if there is no value defined for the given key.

For any instance c of Correspondence, c.get(key) may be written using the item operator:

c[key]

Returns the item of the entry with the given key, or the given default if there is no entry with the given key in this map.

For maps with non-null items, the expression:

map.getOrDefault(key, def)

is equivalent to this common idiom:

map[key] else def

However, when the map has null items, getOrDefault() will preserve them.

Note that high-quality implementations of Map should refine this default implementation.

The entries with keys larger than or equal to the given key, sorted by key in ascending order.

This is a lazy operation, returning a view of the underlying sorted map.

An iterator for the elements belonging to this stream.

If this is a nonempty stream with type {Element+}, the iterator must produce at least one element.

The entries with keys smaller than or equal to the given key, sorted by key in descending order.

This is a lazy operation, returning a view of the underlying sorted map.

Obtain a measure containing the mapped values starting from the given starting index (from), with the given length. If length<=0, the resulting measure is empty.

For any ranged stream r, r.measure(from, length) may be written using the measure operator:

r[from:length]

The measure should contain the given number (length) of elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream. In the case where the iterator would be exhausted before length elements are produced, the resulting measure contains only those elements which were produced before the iterator was exhausted, and the length of the measure is less then the given length.

When the given index does not belong to this ranged object, the behavior is implementation dependent.

Set the item associated with the given key to the given item. If there is already an item associated with this key, replace the association. Otherwise, create a new association.

For any instance c of KeyedCorrespondenceMutator, c.put(key, item) may be written using the item and assignment operators:

c[key] = item

Remove the entry associated with the given key, if any, from this map, returning the value no longer associated with the given key, if any, or null if there was no entry associated with the given key.

Remove the entry associated with the given key, if any, only if its item is equal to the given item. Return true if an entry was removed, or false otherwise.

Modify the entry associated with the given key, if any, setting its item to the given newItem, only if the its item is currently equal to the given item. Return true if the item was replaced,or false otherwise.

Obtain a span containing the elements between the two given indices.

For any ranged stream r, r.span(from, to) may be written using the span operator:

r[from..to]

The span should contain elements of this stream, starting from the element at the given starting index (from), and ending with the element at the given ending index (to), in the same order as they are produced by the iterator of the stream, except when the ending index occurs earlier than the starting index, in which case they occur in the opposite order.

When one or both of the given indices does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the given starting index (from) and the last index of this ranged object.

For any ranged stream r, r.spanFrom(from) may be written using the span operator:

r[from...]

The span should contain elements of this stream, starting from the element at the given starting index (from), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.

Obtain a span containing the elements between the first index of this ranged stream and given end index (to).

For any ranged stream r, r.spanTo(to) may be written using the span operator:

r[...to]

The span should contain elements of this stream, up to the element at the given ending index (to), in the same order as they are produced by the iterator of the stream.

When the given index does not belong to this ranged stream, the behavior is implementation dependent.