JsonObject (Jakarta EE 8 Specification APIs)

All Superinterfaces:: JsonStructure, JsonValue, Map<String,JsonValue>

public interface JsonObject
extends JsonStructure, Map<String,JsonValue>

JsonObject class represents an immutable JSON object value (an unordered collection of zero or more name/value pairs). It also provides unmodifiable map view to the JSON object name/value mappings.

A JsonObject instance can be created from an input source using JsonReader.readObject(). For example:


 JsonReader jsonReader = Json.createReader(...);
 JsonObject object = jsonReader.readObject();
 jsonReader.close();

It can also be built from scratch using a JsonObjectBuilder.

For example 1: An empty JSON object can be built as follows:


 JsonObject object = Json.createObjectBuilder().build();

For example 2: The following JSON


 {
     "firstName": "John", "lastName": "Smith", "age": 25,
     "address" : {
         "streetAddress": "21 2nd Street",
         "city": "New York",
         "state": "NY",
         "postalCode": "10021"
     },
     "phoneNumber": [
         { "type": "home", "number": "212 555-1234" },
         { "type": "fax", "number": "646 555-4567" }
     ]
 }

can be built using :


 JsonObject value = Json.createObjectBuilder()
     .add("firstName", "John")
     .add("lastName", "Smith")
     .add("age", 25)
     .add("address", Json.createObjectBuilder()
         .add("streetAddress", "21 2nd Street")
         .add("city", "New York")
         .add("state", "NY")
         .add("postalCode", "10021"))
     .add("phoneNumber", Json.createArrayBuilder()
         .add(Json.createObjectBuilder()
             .add("type", "home")
             .add("number", "212 555-1234"))
         .add(Json.createObjectBuilder()
             .add("type", "fax")
             .add("number", "646 555-4567")))
     .build();

JsonObject can be written to JSON as follows:


 JsonWriter writer = ...
 JsonObject obj = ...;
 writer.writeObject(obj);

JsonObject values can be JsonObject, JsonArray, JsonString, JsonNumber, JsonValue.TRUE, JsonValue.FALSE, JsonValue.NULL. These values can be accessed using various accessor methods.

In the above example 2, "John" can be got using


 String firstName = object.getString("firstName");

This map object provides read-only access to the JSON object data, and attempts to modify the map, whether direct or via its collection views, result in an UnsupportedOperationException.

The map object's iteration ordering is based on the order in which name/value pairs are added to the corresponding builder or the order in which name/value pairs appear in the corresponding stream.

Nested Class Summary
- Nested classes/interfaces inherited from interface javax.json.JsonValue
  JsonValue.ValueType
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K,V>

Field Summary
- Fields inherited from interface javax.json.JsonValue
  EMPTY_JSON_ARRAY, EMPTY_JSON_OBJECT, FALSE, NULL, TRUE

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`boolean`	`getBoolean(String name)` Returns the boolean value of the associated mapping for the specified name.
`boolean`	`getBoolean(String name, boolean defaultValue)` Returns the boolean value of the associated mapping for the specified name.
`int`	`getInt(String name)` A convenience method for `getJsonNumber(name).intValue()`
`int`	`getInt(String name, int defaultValue)` Returns the int value of the associated `JsonNumber` mapping for the specified name.
`JsonArray`	`getJsonArray(String name)` Returns the array value to which the specified name is mapped.
`JsonNumber`	`getJsonNumber(String name)` Returns the number value to which the specified name is mapped.
`JsonObject`	`getJsonObject(String name)` Returns the object value to which the specified name is mapped.
`JsonString`	`getJsonString(String name)` Returns the string value to which the specified name is mapped.
`String`	`getString(String name)` A convenience method for `getJsonString(name).getString()`
`String`	`getString(String name, String defaultValue)` Returns the string value of the associated `JsonString` mapping for the specified name.
`boolean`	`isNull(String name)` Returns `true` if the associated value for the specified name is `JsonValue.NULL`.

Methods inherited from interface javax.json.JsonStructure
getValue

Methods inherited from interface javax.json.JsonValue
asJsonArray, asJsonObject, getValueType, toString

Methods inherited from interface java.util.Map
clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

- Method Detail
  - getJsonArray
```
JsonArray getJsonArray(String name)
```
    Returns the array value to which the specified name is mapped. This is a convenience method for (JsonArray)get(name) to get the value.
    
    Parameters:
    
    name - the name whose associated value is to be returned
    
    Returns:
    
    the array value to which the specified name is mapped, or null if this object contains no mapping for the name
    
    Throws:
    
    ClassCastException - if the value to which the specified name is mapped is not assignable to JsonArray type
  - getJsonObject
```
JsonObject getJsonObject(String name)
```
    Returns the object value to which the specified name is mapped. This is a convenience method for (JsonObject)get(name) to get the value.
    
    Parameters:
    
    name - the name whose associated value is to be returned
    
    Returns:
    
    the object value to which the specified name is mapped, or null if this object contains no mapping for the name
    
    Throws:
    
    ClassCastException - if the value to which the specified name is mapped is not assignable to JsonObject type
  - getJsonNumber
```
JsonNumber getJsonNumber(String name)
```
    Returns the number value to which the specified name is mapped. This is a convenience method for (JsonNumber)get(name) to get the value.
    
    Parameters:
    
    name - the name whose associated value is to be returned
    
    Returns:
    
    the number value to which the specified name is mapped, or null if this object contains no mapping for the name
    
    Throws:
    
    ClassCastException - if the value to which the specified name is mapped is not assignable to JsonNumber type
  - getJsonString
```
JsonString getJsonString(String name)
```
    Returns the string value to which the specified name is mapped. This is a convenience method for (JsonString)get(name) to get the value.
    
    Parameters:
    
    name - the name whose associated value is to be returned
    
    Returns:
    
    the string value to which the specified name is mapped, or null if this object contains no mapping for the name
    
    Throws:
    
    ClassCastException - if the value to which the specified name is mapped is not assignable to JsonString type
  - getString
```
String getString(String name)
```
    A convenience method for getJsonString(name).getString()
    
    Parameters:
    
    name - whose associated value is to be returned as String
    
    Returns:
    
    the String value to which the specified name is mapped
    
    Throws:
    
    NullPointerException - if the specified name doesn't have any mapping
    
    ClassCastException - if the value for specified name mapping is not assignable to JsonString
  - getString
```
String getString(String name,
                 String defaultValue)
```
    Returns the string value of the associated JsonString mapping for the specified name. If JsonString is found, then its JsonString.getString() is returned. Otherwise, the specified default value is returned.
    
    Parameters:
    
    name - whose associated value is to be returned as String
    
    defaultValue - a default value to be returned
    
    Returns:
    
    the string value of the associated mapping for the name, or the default value
  - getInt
```
int getInt(String name)
```
    A convenience method for getJsonNumber(name).intValue()
    
    Parameters:
    
    name - whose associated value is to be returned as int
    
    Returns:
    
    the int value to which the specified name is mapped
    
    Throws:
    
    NullPointerException - if the specified name doesn't have any mapping
    
    ClassCastException - if the value for specified name mapping is not assignable to JsonNumber
  - getInt
```
int getInt(String name,
           int defaultValue)
```
    Returns the int value of the associated JsonNumber mapping for the specified name. If JsonNumber is found, then its JsonNumber.intValue() is returned. Otherwise, the specified default value is returned.
    
    Parameters:
    
    name - whose associated value is to be returned as int
    
    defaultValue - a default value to be returned
    
    Returns:
    
    the int value of the associated mapping for the name, or the default value
  - getBoolean
```
boolean getBoolean(String name)
```
    Returns the boolean value of the associated mapping for the specified name. If the associated mapping is JsonValue.TRUE, then returns true. If the associated mapping is JsonValue.FALSE, then returns false.
    
    Parameters:
    
    name - whose associated value is to be returned as boolean
    
    Returns:
    
    the boolean value to which the specified name is mapped
    
    Throws:
    
    NullPointerException - if the specified name doesn't have any mapping
    
    ClassCastException - if the value for specified name mapping is not assignable to JsonValue.TRUE or JsonValue.FALSE
  - getBoolean
```
boolean getBoolean(String name,
                   boolean defaultValue)
```
    Returns the boolean value of the associated mapping for the specified name. If the associated mapping is JsonValue.TRUE, then returns true. If the associated mapping is JsonValue.FALSE, then returns false. Otherwise, the specified default value is returned.
    
    Parameters:
    
    name - whose associated value is to be returned as int
    
    defaultValue - a default value to be returned
    
    Returns:
    
    the boolean value of the associated mapping for the name, or the default value
  - isNull
```
boolean isNull(String name)
```
    Returns true if the associated value for the specified name is JsonValue.NULL.
    
    Parameters:
    
    name - name whose associated value is checked
    
    Returns:
    
    return true if the associated value is JsonValue.NULL, otherwise false
    
    Throws:
    
    NullPointerException - if the specified name doesn't have any mapping

Interface JsonObject

Nested Class Summary

Nested classes/interfaces inherited from interface javax.json.JsonValue

Nested classes/interfaces inherited from interface java.util.Map

Field Summary

Fields inherited from interface javax.json.JsonValue

Method Summary

Methods inherited from interface javax.json.JsonStructure

Methods inherited from interface javax.json.JsonValue

Methods inherited from interface java.util.Map

Method Detail

getJsonArray

getJsonObject

getJsonNumber

getJsonString

getString

getString

getInt

getInt

getBoolean

getBoolean

isNull