JSONObject (twitter4j-core 4.0.7 API)

java.lang.Object
- twitter4j.JSONObject

```
public class JSONObject
extends Object
```
A modifiable set of name/value mappings. Names are unique, non-null strings. Values may be any mix of JSONObjects, JSONArrays, Strings, Booleans, Integers, Longs, Doubles or NULL. Values may not be null, NaNs, infinities, or of any type not listed here.
This class can coerce values to another type when requested.
- When the requested type is a boolean, strings will be coerced using a case-insensitive comparison to "true" and "false".
- When the requested type is a double, other Number types will be coerced using doubleValue. Strings that can be coerced using Double.valueOf(String) will be.
- When the requested type is an int, other Number types will be coerced using intValue. Strings that can be coerced using Double.valueOf(String) will be, and then cast to int.
- When the requested type is a long, other Number types will be coerced using longValue. Strings that can be coerced using Double.valueOf(String) will be, and then cast to long. This two-step conversion is lossy for very large values. For example, the string "9223372036854775806" yields the long 9223372036854775807.
- When the requested type is a String, other non-null values will be coerced using String.valueOf(Object). Although null cannot be coerced, the sentinel value NULL is coerced to the string "null".
This class can look up both mandatory and optional values:
- Use getType() to retrieve a mandatory value. This fails with a JSONException if the requested name has no value or if the value cannot be coerced to the requested type.
- Use optType() to retrieve an optional value. This returns a system- or user-supplied default if the requested name has no value or if the value cannot be coerced to the requested type.
Warning: this class represents null in two incompatible ways: the standard Java null reference, and the sentinel value NULL. In particular, calling put(name, null) removes the named entry from the object but put(name, JSONObject.NULL) stores an entry whose value is JSONObject.NULL.
Instances of this class are not thread safe. Although this class is nonfinal, it was not designed for inheritance and should not be subclassed. In particular, self-use by overrideable methods is not specified. See Effective Java Item 17, "Design and Document or inheritance or else prohibit it" for further information.

Field Summary

Fields
Modifier and Type Field and Description

static Object NULL
A sentinel value used to explicitly define a name with no value.

Fields
Modifier and Type	Field and Description
`static Object`	`NULL` A sentinel value used to explicitly define a name with no value.

Constructor Summary

Constructors
Constructor and Description
`JSONObject()` Creates a `JSONObject` with no name/value mappings.
`JSONObject(JSONObject copyFrom, String[] names)` Creates a new `JSONObject` by copying mappings for the listed names from the given object.
`JSONObject(JSONTokener readFrom)` Creates a new `JSONObject` with name/value mappings from the next object in the tokener.
`JSONObject(Map copyFrom)` Creates a new `JSONObject` by copying all name/value mappings from the given map.
`JSONObject(String json)` Creates a new `JSONObject` with name/value mappings from the JSON string.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`JSONObject`	`accumulate(String name, Object value)` Appends `value` to the array already mapped to `name`.
`JSONObject`	`append(String name, Object value)` Appends values to the array mapped to `name`.
`Object`	`get(String name)` Returns the value mapped by `name`, or throws if no such mapping exists.
`boolean`	`getBoolean(String name)` Returns the value mapped by `name` if it exists and is a boolean or can be coerced to a boolean, or throws otherwise.
`double`	`getDouble(String name)` Returns the value mapped by `name` if it exists and is a double or can be coerced to a double, or throws otherwise.
`int`	`getInt(String name)` Returns the value mapped by `name` if it exists and is an int or can be coerced to an int, or throws otherwise.
`JSONArray`	`getJSONArray(String name)` Returns the value mapped by `name` if it exists and is a `JSONArray`, or throws otherwise.
`JSONObject`	`getJSONObject(String name)` Returns the value mapped by `name` if it exists and is a `JSONObject`, or throws otherwise.
`long`	`getLong(String name)` Returns the value mapped by `name` if it exists and is a long or can be coerced to a long, or throws otherwise.
`String`	`getString(String name)` Returns the value mapped by `name` if it exists, coercing it if necessary, or throws if no such mapping exists.
`boolean`	`has(String name)` Returns true if this object has a mapping for `name`.
`boolean`	`isNull(String name)` Returns true if this object has no mapping for `name` or if it has a mapping whose value is `NULL`.
`Iterator<String>`	`keys()` Returns an iterator of the `String` names in this object.
`Set<String>`	`keySet()` Returns the set of `String` names in this object.
`int`	`length()` Returns the number of name/value mappings in this object.
`JSONArray`	`names()` Returns an array containing the string names in this object.
`static String`	`numberToString(Number number)` Encodes the number as a JSON string.
`Object`	`opt(String name)` Returns the value mapped by `name`, or null if no such mapping exists.
`boolean`	`optBoolean(String name)` Returns the value mapped by `name` if it exists and is a boolean or can be coerced to a boolean, or false otherwise.
`boolean`	`optBoolean(String name, boolean fallback)` Returns the value mapped by `name` if it exists and is a boolean or can be coerced to a boolean, or `fallback` otherwise.
`double`	`optDouble(String name)` Returns the value mapped by `name` if it exists and is a double or can be coerced to a double, or `NaN` otherwise.
`double`	`optDouble(String name, double fallback)` Returns the value mapped by `name` if it exists and is a double or can be coerced to a double, or `fallback` otherwise.
`int`	`optInt(String name)` Returns the value mapped by `name` if it exists and is an int or can be coerced to an int, or 0 otherwise.
`int`	`optInt(String name, int fallback)` Returns the value mapped by `name` if it exists and is an int or can be coerced to an int, or `fallback` otherwise.
`JSONArray`	`optJSONArray(String name)` Returns the value mapped by `name` if it exists and is a `JSONArray`, or null otherwise.
`JSONObject`	`optJSONObject(String name)` Returns the value mapped by `name` if it exists and is a `JSONObject`, or null otherwise.
`long`	`optLong(String name)` Returns the value mapped by `name` if it exists and is a long or can be coerced to a long, or 0 otherwise.
`long`	`optLong(String name, long fallback)` Returns the value mapped by `name` if it exists and is a long or can be coerced to a long, or `fallback` otherwise.
`String`	`optString(String name)` Returns the value mapped by `name` if it exists, coercing it if necessary, or the empty string if no such mapping exists.
`String`	`optString(String name, String fallback)` Returns the value mapped by `name` if it exists, coercing it if necessary, or `fallback` if no such mapping exists.
`JSONObject`	`put(String name, boolean value)` Maps `name` to `value`, clobbering any existing name/value mapping with the same name.
`JSONObject`	`put(String name, double value)` Maps `name` to `value`, clobbering any existing name/value mapping with the same name.
`JSONObject`	`put(String name, int value)` Maps `name` to `value`, clobbering any existing name/value mapping with the same name.
`JSONObject`	`put(String name, long value)` Maps `name` to `value`, clobbering any existing name/value mapping with the same name.
`JSONObject`	`put(String name, Object value)` Maps `name` to `value`, clobbering any existing name/value mapping with the same name.
`JSONObject`	`putOpt(String name, Object value)` Equivalent to `put(name, value)` when both parameters are non-null; does nothing otherwise.
`static String`	`quote(String data)` Encodes `data` as a JSON string.
`Object`	`remove(String name)` Removes the named mapping if it exists; does nothing otherwise.
`JSONArray`	`toJSONArray(JSONArray names)` Returns an array with the values corresponding to `names`.
`String`	`toString()` Encodes this object as a compact JSON string, such as:
`String`	`toString(int indentSpaces)` Encodes this object as a human readable JSON string for debugging, such as:
`static Object`	`wrap(Object o)` Wraps the given object if necessary.

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

- Field Detail
  - NULL
```
public static final Object NULL
```
    A sentinel value used to explicitly define a name with no value. Unlike null, names with this value:
    - show up in the names() array
    - show up in the keys() iterator
    - return true for has(String)
    - do not throw on get(String)
    - are included in the encoded JSON string.
    This value violates the general contract of Object.equals(java.lang.Object) by returning true when compared to null. Its toString() method returns "null".
- Constructor Detail
  - JSONObject
```
public JSONObject()
```
    Creates a JSONObject with no name/value mappings.
  - JSONObject
```
public JSONObject(Map copyFrom)
```
    Creates a new JSONObject by copying all name/value mappings from the given map.
    
    Parameters:
    
    copyFrom - a map whose keys are of type String and whose values are of supported types.
    
    Throws:
    
    NullPointerException - if any of the map's keys are null.
  - JSONObject
```
public JSONObject(JSONTokener readFrom)
           throws JSONException
```
    Creates a new JSONObject with name/value mappings from the next object in the tokener.
    
    Parameters:
    
    readFrom - a tokener whose nextValue() method will yield a JSONObject.
    
    Throws:
    
    JSONException - if the parse fails or doesn't yield a JSONObject.
  - JSONObject
```
public JSONObject(String json)
           throws JSONException
```
    Creates a new JSONObject with name/value mappings from the JSON string.
    
    Parameters:
    
    json - a JSON-encoded string containing an object.
    
    Throws:
    
    JSONException - if the parse fails or doesn't yield a JSONObject.
  - JSONObject
```
public JSONObject(JSONObject copyFrom,
                  String[] names)
           throws JSONException
```
    Creates a new JSONObject by copying mappings for the listed names from the given object. Names that aren't present in copyFrom will be skipped.
    
    Parameters:
    
    copyFrom - The source object.
    
    names - The names of the fields to copy.
    
    Throws:
    
    JSONException - On internal errors. Shouldn't happen.
- Method Detail
  - length
```
public int length()
```
    Returns the number of name/value mappings in this object.
    
    Returns:
    
    the length of this.
  - put
```
public JSONObject put(String name,
                      boolean value)
               throws JSONException
```
    Maps name to value, clobbering any existing name/value mapping with the same name.
    
    Parameters:
    
    name - The name of the value to insert.
    
    value - The value to insert.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - Should not be possible.
  - put
```
public JSONObject put(String name,
                      double value)
               throws JSONException
```
    Maps name to value, clobbering any existing name/value mapping with the same name.
    
    Parameters:
    
    name - The name for the new value.
    
    value - a finite value. May not be NaNs or infinities.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - if value is NaN or infinite.
  - put
```
public JSONObject put(String name,
                      int value)
               throws JSONException
```
    Maps name to value, clobbering any existing name/value mapping with the same name.
    
    Parameters:
    
    name - The name for the new value.
    
    value - The new value.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - Should not be possible.
  - put
```
public JSONObject put(String name,
                      long value)
               throws JSONException
```
    Maps name to value, clobbering any existing name/value mapping with the same name.
    
    Parameters:
    
    name - The name of the new value.
    
    value - The new value to insert.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - Should not be possible.
  - put
```
public JSONObject put(String name,
                      Object value)
               throws JSONException
```
    Maps name to value, clobbering any existing name/value mapping with the same name. If the value is null, any existing mapping for name is removed.
    
    Parameters:
    
    name - The name of the new value.
    
    value - a JSONObject, JSONArray, String, Boolean, Integer, Long, Double, NULL, or null. May not be NaNs or infinities.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - if the value is an invalid double (infinite or NaN).
  - putOpt
```
public JSONObject putOpt(String name,
                         Object value)
                  throws JSONException
```
    Equivalent to put(name, value) when both parameters are non-null; does nothing otherwise.
    
    Parameters:
    
    name - The name of the value to insert.
    
    value - The value to insert.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - if the value is an invalid double (infinite or NaN).
  - accumulate
```
public JSONObject accumulate(String name,
                             Object value)
                      throws JSONException
```
    Appends value to the array already mapped to name. If this object has no mapping for name, this inserts a new mapping. If the mapping exists but its value is not an array, the existing and new values are inserted in order into a new array which is itself mapped to name. In aggregate, this allows values to be added to a mapping one at a time. Note that append(String, Object) provides better semantics. In particular, the mapping for name will always be a JSONArray. Using accumulate will result in either a JSONArray or a mapping whose type is the type of value depending on the number of calls to it.
    
    Parameters:
    
    name - The name of the field to change.
    
    value - a JSONObject, JSONArray, String, Boolean, Integer, Long, Double, NULL or null. May not be NaNs or infinities.
    
    Returns:
    
    this object after mutation.
    
    Throws:
    
    JSONException - If the object being added is an invalid number.
  - append
```
public JSONObject append(String name,
                         Object value)
                  throws JSONException
```
    Appends values to the array mapped to name. A new JSONArray mapping for name will be inserted if no mapping exists. If the existing mapping for name is not a JSONArray, a JSONException will be thrown.
    
    Parameters:
    
    name - The name of the array to which the value should be appended.
    
    value - The value to append.
    
    Returns:
    
    this object.
    
    Throws:
    
    JSONException - if name is null or if the mapping for name is non-null and is not a JSONArray.
  - remove
```
public Object remove(String name)
```
    Removes the named mapping if it exists; does nothing otherwise.
    
    Parameters:
    
    name - The name of the mapping to remove.
    
    Returns:
    
    the value previously mapped by name, or null if there was no such mapping.
  - isNull
```
public boolean isNull(String name)
```
    Returns true if this object has no mapping for name or if it has a mapping whose value is NULL.
    
    Parameters:
    
    name - The name of the value to check on.
    
    Returns:
    
    true if the field doesn't exist or is null.
  - has
```
public boolean has(String name)
```
    Returns true if this object has a mapping for name. The mapping may be NULL.
    
    Parameters:
    
    name - The name of the value to check on.
    
    Returns:
    
    true if this object has a field named name
  - get
```
public Object get(String name)
           throws JSONException
```
    Returns the value mapped by name, or throws if no such mapping exists.
    
    Parameters:
    
    name - The name of the value to get.
    
    Returns:
    
    The value.
    
    Throws:
    
    JSONException - if no such mapping exists.
  - opt
```
public Object opt(String name)
```
    Returns the value mapped by name, or null if no such mapping exists.
    
    Parameters:
    
    name - The name of the value to get.
    
    Returns:
    
    The value.
  - getBoolean
```
public boolean getBoolean(String name)
                   throws JSONException
```
    Returns the value mapped by name if it exists and is a boolean or can be coerced to a boolean, or throws otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
    
    Throws:
    
    JSONException - if the mapping doesn't exist or cannot be coerced to a boolean.
  - optBoolean
```
public boolean optBoolean(String name)
```
    Returns the value mapped by name if it exists and is a boolean or can be coerced to a boolean, or false otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
  - optBoolean
```
public boolean optBoolean(String name,
                          boolean fallback)
```
    Returns the value mapped by name if it exists and is a boolean or can be coerced to a boolean, or fallback otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    fallback - The value to return if the field isn't there.
    
    Returns:
    
    The selected value or the fallback.
  - getDouble
```
public double getDouble(String name)
                 throws JSONException
```
    Returns the value mapped by name if it exists and is a double or can be coerced to a double, or throws otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
    
    Throws:
    
    JSONException - if the mapping doesn't exist or cannot be coerced to a double.
  - optDouble
```
public double optDouble(String name)
```
    Returns the value mapped by name if it exists and is a double or can be coerced to a double, or NaN otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
  - optDouble
```
public double optDouble(String name,
                        double fallback)
```
    Returns the value mapped by name if it exists and is a double or can be coerced to a double, or fallback otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    fallback - The value to return if the field isn't there.
    
    Returns:
    
    The selected value or the fallback.
  - getInt
```
public int getInt(String name)
           throws JSONException
```
    Returns the value mapped by name if it exists and is an int or can be coerced to an int, or throws otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
    
    Throws:
    
    JSONException - if the mapping doesn't exist or cannot be coerced to an int.
  - optInt
```
public int optInt(String name)
```
    Returns the value mapped by name if it exists and is an int or can be coerced to an int, or 0 otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value if it exists.
  - optInt
```
public int optInt(String name,
                  int fallback)
```
    Returns the value mapped by name if it exists and is an int or can be coerced to an int, or fallback otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    fallback - The value to return if the field isn't there.
    
    Returns:
    
    The selected value or the fallback.
  - getLong
```
public long getLong(String name)
             throws JSONException
```
    Returns the value mapped by name if it exists and is a long or can be coerced to a long, or throws otherwise. Note that JSON represents numbers as doubles, so this is lossy; use strings to transfer numbers via JSON without loss.
    
    Parameters:
    
    name - The name of the field that we want.
    
    Returns:
    
    The value of the field.
    
    Throws:
    
    JSONException - if the mapping doesn't exist or cannot be coerced to a long.
  - optLong
```
public long optLong(String name)
```
    Returns the value mapped by name if it exists and is a long or can be coerced to a long, or 0 otherwise. Note that JSON represents numbers as doubles, so this is lossy; use strings to transfer numbers via JSON.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The selected value.
  - optLong
```
public long optLong(String name,
                    long fallback)
```
    Returns the value mapped by name if it exists and is a long or can be coerced to a long, or fallback otherwise. Note that JSON represents numbers as doubles, so this is lossy; use strings to transfer numbers via JSON.
    
    Parameters:
    
    name - The name of the field we want.
    
    fallback - The value to return if the field isn't there.
    
    Returns:
    
    The selected value or the fallback.
  - getString
```
public String getString(String name)
                 throws JSONException
```
    Returns the value mapped by name if it exists, coercing it if necessary, or throws if no such mapping exists.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The value of the field.
    
    Throws:
    
    JSONException - if no such mapping exists.
  - optString
```
public String optString(String name)
```
    Returns the value mapped by name if it exists, coercing it if necessary, or the empty string if no such mapping exists.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The value of the field.
  - optString
```
public String optString(String name,
                        String fallback)
```
    Returns the value mapped by name if it exists, coercing it if necessary, or fallback if no such mapping exists.
    
    Parameters:
    
    name - The name of the field that we want.
    
    fallback - The value to return if the field doesn't exist.
    
    Returns:
    
    The value of the field or fallback.
  - getJSONArray
```
public JSONArray getJSONArray(String name)
                       throws JSONException
```
    Returns the value mapped by name if it exists and is a JSONArray, or throws otherwise.
    
    Parameters:
    
    name - The field we want to get.
    
    Returns:
    
    The value of the field (if it is a JSONArray.
    
    Throws:
    
    JSONException - if the mapping doesn't exist or is not a JSONArray.
  - optJSONArray
```
public JSONArray optJSONArray(String name)
```
    Returns the value mapped by name if it exists and is a JSONArray, or null otherwise.
    
    Parameters:
    
    name - The name of the field we want.
    
    Returns:
    
    The value of the specified field (assuming it is a JSNOArray
  - getJSONObject
```
public JSONObject getJSONObject(String name)
                         throws JSONException
```
    Returns the value mapped by name if it exists and is a JSONObject, or throws otherwise.
    
    Parameters:
    
    name - The name of the field that we want.
    
    Returns:
    
    a specified field value (if it is a JSONObject)
    
    Throws:
    
    JSONException - if the mapping doesn't exist or is not a JSONObject.
  - optJSONObject
```
public JSONObject optJSONObject(String name)
```
    Returns the value mapped by name if it exists and is a JSONObject, or null otherwise.
    
    Parameters:
    
    name - The name of the value we want.
    
    Returns:
    
    The specified value.
  - toJSONArray
```
public JSONArray toJSONArray(JSONArray names)
                      throws JSONException
```
    Returns an array with the values corresponding to names. The array contains null for names that aren't mapped. This method returns null if names is either null or empty.
    
    Parameters:
    
    names - The names of the fields that we want the values for.
    
    Returns:
    
    The selected values.
    
    Throws:
    
    JSONException - On internal errors. Shouldn't happen.
  - keys
```
public Iterator<String> keys()
```
    Returns an iterator of the String names in this object. The returned iterator supports remove, which will remove the corresponding mapping from this object. If this object is modified after the iterator is returned, the iterator's behavior is undefined. The order of the keys is undefined.
    
    Returns:
    
    an iterator over the keys.
  - keySet
```
public Set<String> keySet()
```
    Returns the set of String names in this object. The returned set is a view of the keys in this object. Set.remove(Object) will remove the corresponding mapping from this object and set iterator behaviour is undefined if this object is modified after it is returned. See keys().
    
    Returns:
    
    The names in this object.
  - names
```
public JSONArray names()
```
    Returns an array containing the string names in this object. This method returns null if this object contains no mappings.
    
    Returns:
    
    the names.
  - toString
```
public String toString()
```
    Encodes this object as a compact JSON string, such as:
```
{"query":"Pizza","locations":[94043,90210]}
```
    Overrides:
    
    toString in class Object
  - toString
```
public String toString(int indentSpaces)
                throws JSONException
```
    Encodes this object as a human readable JSON string for debugging, such as:
```
 {
     "query": "Pizza",
     "locations": [
         94043,
         90210
     ]
 }
```
    Parameters:
    
    indentSpaces - the number of spaces to indent for each level of nesting.
    
    Returns:
    
    The string containing the pretty form of this.
    
    Throws:
    
    JSONException - On internal errors. Shouldn't happen.
  - numberToString
```
public static String numberToString(Number number)
                             throws JSONException
```
    Encodes the number as a JSON string.
    
    Parameters:
    
    number - a finite value. May not be NaNs or infinities.
    
    Returns:
    
    The encoded number in string form.
    
    Throws:
    
    JSONException - On internal errors. Shouldn't happen.
  - quote
```
public static String quote(String data)
```
    Encodes data as a JSON string. This applies quotes and any necessary character escaping.
    
    Parameters:
    
    data - the string to encode. Null will be interpreted as an empty string.
    
    Returns:
    
    the quoted string.
  - wrap
```
public static Object wrap(Object o)
```
    Wraps the given object if necessary.
    If the object is null or , returns NULL. If the object is a JSONArray or JSONObject, no wrapping is necessary. If the object is NULL, no wrapping is necessary. If the object is an array or Collection, returns an equivalent JSONArray. If the object is a Map, returns an equivalent JSONObject. If the object is a primitive wrapper type or String, returns the object. Otherwise if the object is from a java package, returns the result of toString. If wrapping fails, returns null.
    
    Parameters:
    
    o - The object to wrap.
    
    Returns:
    
    The wrapped (if necessary) form of the object {$code o}

Class JSONObject

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NULL

Constructor Detail

JSONObject

JSONObject

JSONObject

JSONObject

JSONObject

Method Detail

length

put

put

put

put

put

putOpt

accumulate

append

remove

isNull

has

get

opt

getBoolean

optBoolean

optBoolean

getDouble

optDouble

optDouble

getInt

optInt

optInt

getLong

optLong

optLong

getString

optString

optString

getJSONArray

optJSONArray

getJSONObject

optJSONObject

toJSONArray

keys

keySet

names

toString

toString

numberToString

quote

wrap