org.apache.commons.lang3.stream

Class LangCollectors

java.lang.Object

org.apache.commons.lang3.stream.LangCollectors

public final class LangCollectors
extends java.lang.Object

Implementations of Collector that implement various useful reduction operations.

This class is called LangCollectors instead of Collectors to avoid clashes with Collectors.

Since:

3.13.0

Method Summary

Modifier and Type	Method and Description
static java.util.stream.Collector<java.lang.Object,?,java.lang.String>	joining() Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.
static java.util.stream.Collector<java.lang.Object,?,java.lang.String>	joining(java.lang.CharSequence delimiter) Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.
static java.util.stream.Collector<java.lang.Object,?,java.lang.String>	joining(java.lang.CharSequence delimiter, java.lang.CharSequence prefix, java.lang.CharSequence suffix) Returns a Collector that concatenates the input elements, separated by the specified delimiter, with the specified prefix and suffix, in encounter order.
static java.util.stream.Collector<java.lang.Object,?,java.lang.String>	joining(java.lang.CharSequence delimiter, java.lang.CharSequence prefix, java.lang.CharSequence suffix, java.util.function.Function<java.lang.Object,java.lang.String> toString) Returns a Collector that concatenates the input elements, separated by the specified delimiter, with the specified prefix and suffix, in encounter order.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

joining

public static java.util.stream.Collector<java.lang.Object,?,java.lang.String> joining()

Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.

This is a variation of Collectors.joining() that works with any element class, not just CharSequence.

Returns:

A Collector which concatenates Object elements, separated by the specified delimiter, in encounter order.

joining

public static java.util.stream.Collector<java.lang.Object,?,java.lang.String> joining(java.lang.CharSequence delimiter)

Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order.

This is a variation of Collectors.joining(CharSequence) that works with any element class, not just CharSequence.

Parameters:

delimiter - the delimiter to be used between each element.

Returns:

A Collector which concatenates Object elements, separated by the specified delimiter, in encounter order.

joining

public static java.util.stream.Collector<java.lang.Object,?,java.lang.String> joining(java.lang.CharSequence delimiter,
                                                                                      java.lang.CharSequence prefix,
                                                                                      java.lang.CharSequence suffix)

Returns a Collector that concatenates the input elements, separated by the specified delimiter, with the specified prefix and suffix, in encounter order.

This is a variation of Collectors.joining(CharSequence, CharSequence, CharSequence) that works with any element class, not just CharSequence.

Parameters:

delimiter - the delimiter to be used between each element

prefix - the sequence of characters to be used at the beginning of the joined result

suffix - the sequence of characters to be used at the end of the joined result

Returns:

A Collector which concatenates CharSequence elements, separated by the specified delimiter, in encounter order

joining

public static java.util.stream.Collector<java.lang.Object,?,java.lang.String> joining(java.lang.CharSequence delimiter,
                                                                                      java.lang.CharSequence prefix,
                                                                                      java.lang.CharSequence suffix,
                                                                                      java.util.function.Function<java.lang.Object,java.lang.String> toString)

Returns a Collector that concatenates the input elements, separated by the specified delimiter, with the specified prefix and suffix, in encounter order.

This is a variation of Collectors.joining(CharSequence, CharSequence, CharSequence) that works with any element class, not just CharSequence.

Parameters:

delimiter - the delimiter to be used between each element

prefix - the sequence of characters to be used at the beginning of the joined result

suffix - the sequence of characters to be used at the end of the joined result

toString - A function that takes an Object and returns a non-null String.

Returns:

A Collector which concatenates CharSequence elements, separated by the specified delimiter, in encounter order