java.lang.Object
- org.apache.el.stream.Stream

```
public class Stream
extends java.lang.Object
```
A stream of elements supporting sequential operations such as filter, map, reduce, and various terminal operations.

Constructor Summary

Constructors
Constructor Description

Stream(java.util.Iterator<java.lang.Object> iterator)
Constructs a new Stream from the given iterator.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Optional`	`allMatch(LambdaExpression le)`	Checks if all elements in the stream match the given predicate.
`Optional`	`anyMatch(LambdaExpression le)`	Checks if any element in the stream matches the given predicate.
`Optional`	`average()`	Calculates the average of all numeric elements in the stream.
`java.lang.Long`	`count()`	Counts the number of elements in the stream.
`Stream`	`distinct()`	Returns a stream consisting of the distinct elements of this stream.
`Stream`	`filter(LambdaExpression le)`	Returns a stream consisting of the elements that match the given predicate.
`Optional`	`findFirst()`	Returns an Optional describing the first element of this stream, or an empty Optional if the stream is empty.
`Stream`	`flatMap(LambdaExpression le)`	Returns a stream consisting of the results of replacing each element of this stream with the contents of a stream produced by applying the provided function to each element.
`java.lang.Object`	`forEach(LambdaExpression le)`	Performs an action for each element of this stream.
`java.util.Iterator<?>`	`iterator()`	Returns the underlying iterator for this stream.
`Stream`	`limit(java.lang.Number count)`	Returns a stream consisting of the first `count` elements of this stream.
`Stream`	`map(LambdaExpression le)`	Returns a stream consisting of the results of applying the given function to the elements of this stream.
`Optional`	`max()`	Returns the maximum element of this stream according to natural order.
`Optional`	`max(LambdaExpression le)`	Returns the maximum element of this stream according to the provided comparator.
`Optional`	`min()`	Returns the minimum element of this stream according to natural order.
`Optional`	`min(LambdaExpression le)`	Returns the minimum element of this stream according to the provided comparator.
`Optional`	`noneMatch(LambdaExpression le)`	Checks if no elements of this stream match the given predicate.
`Stream`	`peek(LambdaExpression le)`	Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed.
`Optional`	`reduce(LambdaExpression le)`	Performs a reduction on the elements of this stream, using the provided accumulator function.
`java.lang.Object`	`reduce(java.lang.Object seed, LambdaExpression le)`	Performs a reduction on the elements of this stream, using the provided initial value and accumulator function.
`Stream`	`sorted()`	Returns a stream consisting of the elements of this stream, sorted according to natural order.
`Stream`	`sorted(LambdaExpression le)`	Returns a stream consisting of the elements of this stream, sorted according to the order induced by the provided comparator.
`Stream`	`substream(java.lang.Number start)`	Returns a stream consisting of the elements of this stream from the specified start position to the end.
`Stream`	`substream(java.lang.Number start, java.lang.Number end)`	Returns a stream consisting of the elements of this stream from the specified start position up to, but not including, the specified end position.
`java.lang.Number`	`sum()`	Returns the sum of all numeric elements in the stream.
`java.lang.Object[]`	`toArray()`	Returns an array containing all the elements of this stream.
`java.util.List<java.lang.Object>`	`toList()`	Returns a list containing all the elements of this stream.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Stream
```
public Stream(java.util.Iterator<java.lang.Object> iterator)
```
    Constructs a new Stream from the given iterator.
    
    Parameters:
    
    iterator - the iterator providing the stream elements
- Method Detail
  - filter
```
public Stream filter(LambdaExpression le)
```
    Returns a stream consisting of the elements that match the given predicate.
    
    Parameters:
    
    le - the predicate to apply to each element
    
    Returns:
    
    the new filtered stream
  - map
```
public Stream map(LambdaExpression le)
```
    Returns a stream consisting of the results of applying the given function to the elements of this stream.
    
    Parameters:
    
    le - the function to apply to each element
    
    Returns:
    
    the new mapped stream
  - flatMap
```
public Stream flatMap(LambdaExpression le)
```
    Returns a stream consisting of the results of replacing each element of this stream with the contents of a stream produced by applying the provided function to each element.
    
    Parameters:
    
    le - the function to apply to each element which produces a new stream
    
    Returns:
    
    the new flattened stream
  - distinct
```
public Stream distinct()
```
    Returns a stream consisting of the distinct elements of this stream.
    
    Returns:
    
    the new stream with distinct elements
  - sorted
```
public Stream sorted()
```
    Returns a stream consisting of the elements of this stream, sorted according to natural order.
    
    Returns:
    
    the new sorted stream
  - sorted
```
public Stream sorted(LambdaExpression le)
```
    Returns a stream consisting of the elements of this stream, sorted according to the order induced by the provided comparator.
    
    Parameters:
    
    le - the comparator to determine sort order
    
    Returns:
    
    the new sorted stream
  - forEach
```
public java.lang.Object forEach(LambdaExpression le)
```
    Performs an action for each element of this stream.
    
    Parameters:
    
    le - the action to perform for each element
    
    Returns:
    
    null
  - peek
```
public Stream peek(LambdaExpression le)
```
    Returns a stream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed.
    
    Parameters:
    
    le - the action to perform on each element
    
    Returns:
    
    the new stream
  - iterator
```
public java.util.Iterator<?> iterator()
```
    Returns the underlying iterator for this stream.
    
    Returns:
    
    the underlying iterator
  - limit
```
public Stream limit(java.lang.Number count)
```
    Returns a stream consisting of the first count elements of this stream.
    
    Parameters:
    
    count - the number of elements to limit to
    
    Returns:
    
    the new limited stream
  - substream
```
public Stream substream(java.lang.Number start)
```
    Returns a stream consisting of the elements of this stream from the specified start position to the end.
    
    Parameters:
    
    start - the start position (inclusive)
    
    Returns:
    
    the new substream
  - substream
```
public Stream substream(java.lang.Number start,
                        java.lang.Number end)
```
    Returns a stream consisting of the elements of this stream from the specified start position up to, but not including, the specified end position.
    
    Parameters:
    
    start - the start position (inclusive)
    
    end - the end position (exclusive)
    
    Returns:
    
    the new substream
  - toList
```
public java.util.List<java.lang.Object> toList()
```
    Returns a list containing all the elements of this stream.
    
    Returns:
    
    the list of elements
  - toArray
```
public java.lang.Object[] toArray()
```
    Returns an array containing all the elements of this stream.
    
    Returns:
    
    the array of elements
  - reduce
```
public Optional reduce(LambdaExpression le)
```
    Performs a reduction on the elements of this stream, using the provided accumulator function. The first element is used as the initial value.
    
    Parameters:
    
    le - the accumulator function
    
    Returns:
    
    an Optional describing the reduced value, or empty if this stream is empty
  - reduce
```
public java.lang.Object reduce(java.lang.Object seed,
                               LambdaExpression le)
```
    Performs a reduction on the elements of this stream, using the provided initial value and accumulator function.
    
    Parameters:
    
    seed - the initial value for the reduction
    
    le - the accumulator function
    
    Returns:
    
    the result of the reduction
  - max
```
public Optional max()
```
    Returns the maximum element of this stream according to natural order.
    
    Returns:
    
    an Optional describing the maximum element, or empty if this stream is empty
  - max
```
public Optional max(LambdaExpression le)
```
    Returns the maximum element of this stream according to the provided comparator.
    
    Parameters:
    
    le - the comparator to determine the maximum
    
    Returns:
    
    an Optional describing the maximum element, or empty if this stream is empty
  - min
```
public Optional min()
```
    Returns the minimum element of this stream according to natural order.
    
    Returns:
    
    an Optional describing the minimum element, or empty if this stream is empty
  - min
```
public Optional min(LambdaExpression le)
```
    Returns the minimum element of this stream according to the provided comparator.
    
    Parameters:
    
    le - the comparator to determine the minimum
    
    Returns:
    
    an Optional describing the minimum element, or empty if this stream is empty
  - average
```
public Optional average()
```
    Calculates the average of all numeric elements in the stream.
    
    Returns:
    
    an Optional containing the average, or empty if the stream is empty
  - sum
```
public java.lang.Number sum()
```
    Returns the sum of all numeric elements in the stream.
    
    Returns:
    
    the sum of all elements
  - count
```
public java.lang.Long count()
```
    Counts the number of elements in the stream.
    
    Returns:
    
    the number of elements
  - anyMatch
```
public Optional anyMatch(LambdaExpression le)
```
    Checks if any element in the stream matches the given predicate.
    
    Parameters:
    
    le - the predicate lambda expression
    
    Returns:
    
    an Optional containing true if any element matches, or empty if the stream is empty
  - allMatch
```
public Optional allMatch(LambdaExpression le)
```
    Checks if all elements in the stream match the given predicate.
    
    Parameters:
    
    le - the predicate lambda expression
    
    Returns:
    
    an Optional containing true if all elements match, or empty if the stream is empty
  - noneMatch
```
public Optional noneMatch(LambdaExpression le)
```
    Checks if no elements of this stream match the given predicate.
    
    Parameters:
    
    le - the predicate lambda expression
    
    Returns:
    
    an Optional containing true if no elements match, or empty if the stream is empty
  - findFirst
```
public Optional findFirst()
```
    Returns an Optional describing the first element of this stream, or an empty Optional if the stream is empty.
    
    Returns:
    
    an Optional describing the first element of this stream

Class Stream

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Stream

Method Detail

filter

map

flatMap

distinct

sorted

sorted

forEach

peek

iterator

limit

substream

substream

toList

toArray

reduce

reduce

max

max

min

min

average

sum

count

anyMatch

allMatch

noneMatch

findFirst