VMware GemFire Java API Reference

CollectionType (Tanzu GemFire 10.2.2)

All Superinterfaces:

DataSerializable, ObjectType, java.io.Serializable

All Known Subinterfaces:

MapType
```
public interface CollectionType
extends ObjectType
```
Represents the type of a collection, an object that can contain element objects.

Since:

GemFire 4.0

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.geode.DataSerializable
  DataSerializable.Replaceable

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`allowsDuplicates()`	Return whether duplicates are kept in this type of collection.
`ObjectType`	`getElementType()`	Return the type of the elements of this collection type.
`boolean`	`isOrdered()`	Return whether this collection type has ordered elements.

Methods inherited from interface org.apache.geode.DataSerializable
fromData, toData

Methods inherited from interface org.apache.geode.cache.query.types.ObjectType
getSimpleClassName, isCollectionType, isMapType, isStructType, resolveClass

- Method Detail
  - getElementType
```
ObjectType getElementType()
```
    Return the type of the elements of this collection type.
    
    Returns:
    
    the type of the elements of this collection type
  - allowsDuplicates
```
boolean allowsDuplicates()
```
    Return whether duplicates are kept in this type of collection. Duplicates are two objects are equal to each other as defined by the equals method.
    
    Returns:
    
    true if duplicates have been retained, false if duplicates have been eliminated
  - isOrdered
```
boolean isOrdered()
```
    Return whether this collection type has ordered elements.
    
    Returns:
    
    true if this collection type is ordered, false if not