CollectionUtil (Apache TinkerPop 4.0.0-beta.1 API)

java.lang.Object
- org.apache.tinkerpop.gremlin.util.CollectionUtil

```
public final class CollectionUtil
extends Object
```
Utility class for working with collections and arrays.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> T[]`	`addFirst(T[] array, T element, Class<T> clazz)`	Adds the element argument to the start of the supplied array argument, but if the array is null then return the element as a new array with just that item in it.
`static <E> List<E>`	`asList(E... elements)`	Converts varargs to a `List`.
`static <K,V> LinkedHashMap<K,V>`	`asMap(Object... elements)`	Converts varargs to a `Map` where the elements are key/value pairs.
`static <E> LinkedHashSet<E>`	`asSet(E... elements)`	Converts varargs to a `Set`.
`static <E> LinkedHashSet<E>`	`asSet(Collection<E> elements)`	Converts `Collection` to a `Set`.
`static <K,V> ConcurrentHashMap<K,V>`	`clone(ConcurrentHashMap<K,V> map)`	Clones a given `ConcurrentHashMap` by creating a new map and copying all entries from the original map.

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

- Method Detail
  - asList
```
public static <E> List<E> asList(E... elements)
```
    Converts varargs to a List.
  - asSet
```
public static <E> LinkedHashSet<E> asSet(E... elements)
```
    Converts varargs to a Set.
  - asSet
```
public static <E> LinkedHashSet<E> asSet(Collection<E> elements)
```
    Converts Collection to a Set.
  - asMap
```
public static <K,V> LinkedHashMap<K,V> asMap(Object... elements)
```
    Converts varargs to a Map where the elements are key/value pairs.
  - clone
```
public static <K,V> ConcurrentHashMap<K,V> clone(ConcurrentHashMap<K,V> map)
```
    Clones a given ConcurrentHashMap by creating a new map and copying all entries from the original map. If the value of an entry is a Set or an ArrayList, a deep copy of the value is created. Otherwise, the value is copied as is.
  - addFirst
```
public static <T> T[] addFirst(T[] array,
                               T element,
                               Class<T> clazz)
```
    Adds the element argument to the start of the supplied array argument, but if the array is null then return the element as a new array with just that item in it.