java.lang.Object
- java.util.AbstractMap<K,V>
- - java.util.HashMap<K,V>
  - - java.util.LinkedHashMap<String,Object>
    - - org.springframework.ui.ModelMap

All Implemented Interfaces:
Serializable, Cloneable, Map<String,Object>
Direct Known Subclasses:
ExtendedModelMap, RedirectAttributesModelMap
```
public class ModelMap
extends LinkedHashMap<String,Object>
```
Implementation of Map for use when building model data for use with UI tools. Supports chained calls and generation of model attribute names.
This class serves as generic model holder for both Servlet and Portlet MVC, but is not tied to either of those. Check out the Model interface for a Java-5-based interface variant that serves the same purpose.
Since:
2.0
Author:
Rob Harrop, Juergen Hoeller
See Also:
Conventions.getVariableName(java.lang.Object), ModelAndView, ModelAndView, Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.util.AbstractMap
  AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Constructor Summary

Constructors
Constructor	Description
`ModelMap()`	Construct a new, empty `ModelMap`.
`ModelMap(Object attributeValue)`	Construct a new `ModelMap` containing the supplied attribute.
`ModelMap(String attributeName, Object attributeValue)`	Construct a new `ModelMap` containing the supplied attribute under the supplied name.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ModelMap`	`addAllAttributes(Collection<?> attributeValues)`	Copy all attributes in the supplied `Collection` into this `Map`, using attribute name generation for each element.
`ModelMap`	`addAllAttributes(Map<String,?> attributes)`	Copy all attributes in the supplied `Map` into this `Map`.
`ModelMap`	`addAttribute(Object attributeValue)`	Add the supplied attribute to this `Map` using a `generated name`.
`ModelMap`	`addAttribute(String attributeName, Object attributeValue)`	Add the supplied attribute under the supplied name.
`boolean`	`containsAttribute(String attributeName)`	Does this model contain an attribute of the given name?
`ModelMap`	`mergeAttributes(Map<String,?> attributes)`	Copy all attributes in the supplied `Map` into this `Map`, with existing objects of the same name taking precedence (i.e.

Methods inherited from class java.util.LinkedHashMap
clear, containsValue, entrySet, forEach, get, getOrDefault, keySet, removeEldestEntry, replaceAll, values

Methods inherited from class java.util.HashMap
clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap
equals, hashCode, toString

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, containsKey, equals, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, size

- Constructor Detail
  - ModelMap
```
public ModelMap()
```
    Construct a new, empty ModelMap.
  - ModelMap
```
public ModelMap(String attributeName,
                Object attributeValue)
```
    Construct a new ModelMap containing the supplied attribute under the supplied name.
    See Also:
    addAttribute(String, Object)
  - ModelMap
```
public ModelMap(Object attributeValue)
```
    Construct a new ModelMap containing the supplied attribute. Uses attribute name generation to generate the key for the supplied model object.
    See Also:
    addAttribute(Object)
- Method Detail
  - addAttribute
```
public ModelMap addAttribute(String attributeName,
                             Object attributeValue)
```
    Add the supplied attribute under the supplied name.
    Parameters:
    attributeName - the name of the model attribute (never null)
    attributeValue - the model attribute value (can be null)
  - addAttribute
```
public ModelMap addAttribute(Object attributeValue)
```
    Add the supplied attribute to this Map using a generated name.
    Note: Empty Collections are not added to the model when using this method because we cannot correctly determine the true convention name. View code should check for null rather than for empty collections as is already done by JSTL tags.
    Parameters:
    attributeValue - the model attribute value (never null)
  - addAllAttributes
```
public ModelMap addAllAttributes(Collection<?> attributeValues)
```
    Copy all attributes in the supplied Collection into this Map, using attribute name generation for each element.
    See Also:
    addAttribute(Object)
  - addAllAttributes
```
public ModelMap addAllAttributes(Map<String,?> attributes)
```
    Copy all attributes in the supplied Map into this Map.
    See Also:
    addAttribute(String, Object)
  - mergeAttributes
```
public ModelMap mergeAttributes(Map<String,?> attributes)
```
    Copy all attributes in the supplied Map into this Map, with existing objects of the same name taking precedence (i.e. not getting replaced).
  - containsAttribute
```
public boolean containsAttribute(String attributeName)
```
    Does this model contain an attribute of the given name?
    Parameters:
    attributeName - the name of the model attribute (never null)
    Returns:
    whether this model contains a corresponding attribute

Class ModelMap

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

Constructor Summary

Method Summary

Methods inherited from class java.util.LinkedHashMap

Methods inherited from class java.util.HashMap

Methods inherited from class java.util.AbstractMap

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Map

Constructor Detail

ModelMap

ModelMap

ModelMap

Method Detail

addAttribute

addAttribute

addAllAttributes

addAllAttributes

mergeAttributes

containsAttribute