org.json

Class JSONArray

public class JSONArray extends Object

A JSONArray is an ordered sequence of values. Its external text form is a string wrapped in square brackets with commas separating the values. The internal form is an object having get and opt methods for accessing the values by index, and put methods for adding or replacing values. The values can be any of these types: Boolean, JSONArray, JSONObject, Number, String, or the JSONObject.NULL object.

The constructor can convert a JSON text into a Java object. The toString method converts to JSON text.

A get method returns a value if one can be found, and throws an exception if one cannot be found. An opt method returns a default value instead of throwing an exception, and so is useful for obtaining optional values.

The generic get() and opt() methods return an object which you can cast or query for type. There are also typed get and opt methods that do type checking and type coersion for you.

The texts produced by the toString methods strictly conform to JSON syntax rules. The constructors are more forgiving in the texts they will accept:

Constructor Summary
JSONArray()
Construct an empty JSONArray.
JSONArray(JSONTokener x)
Construct a JSONArray from a JSONTokener.
JSONArray(String string)
Construct a JSONArray from a source sJSON text.
JSONArray(Collection collection)
Construct a JSONArray from a Collection.
Method Summary
Objectget(int index)
Get the object value associated with an index.
booleangetBoolean(int index)
Get the boolean value associated with an index.
doublegetDouble(int index)
Get the double value associated with an index.
intgetInt(int index)
Get the int value associated with an index.
JSONArraygetJSONArray(int index)
Get the JSONArray associated with an index.
JSONObjectgetJSONObject(int index)
Get the JSONObject associated with an index.
longgetLong(int index)
Get the long value associated with an index.
StringgetString(int index)
Get the string associated with an index.
booleanisNull(int index)
Determine if the value is null.
Stringjoin(String separator)
Make a string from the contents of this JSONArray.
intlength()
Get the number of elements in the JSONArray, included nulls.
Objectopt(int index)
Get the optional object value associated with an index.
booleanoptBoolean(int index)
Get the optional boolean value associated with an index.
booleanoptBoolean(int index, boolean defaultValue)
Get the optional boolean value associated with an index.
doubleoptDouble(int index)
Get the optional double value associated with an index.
doubleoptDouble(int index, double defaultValue)
Get the optional double value associated with an index.
intoptInt(int index)
Get the optional int value associated with an index.
intoptInt(int index, int defaultValue)
Get the optional int value associated with an index.
JSONArrayoptJSONArray(int index)
Get the optional JSONArray associated with an index.
JSONObjectoptJSONObject(int index)
Get the optional JSONObject associated with an index.
longoptLong(int index)
Get the optional long value associated with an index.
longoptLong(int index, long defaultValue)
Get the optional long value associated with an index.
StringoptString(int index)
Get the optional string value associated with an index.
StringoptString(int index, String defaultValue)
Get the optional string associated with an index.
JSONArrayput(boolean value)
Append a boolean value.
JSONArrayput(Collection value)
Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.
JSONArrayput(double value)
Append a double value.
JSONArrayput(int value)
Append an int value.
JSONArrayput(long value)
Append an long value.
JSONArrayput(Map value)
Put a value in the JSONArray, where the value will be a JSONObject which is produced from a Map.
JSONArrayput(Object value)
Append an object value.
JSONArrayput(int index, boolean value)
Put or replace a boolean value in the JSONArray.
JSONArrayput(int index, Collection value)
Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.
JSONArrayput(int index, double value)
Put or replace a double value.
JSONArrayput(int index, int value)
Put or replace an int value.
JSONArrayput(int index, long value)
Put or replace a long value.
JSONArrayput(int index, Map value)
Put a value in the JSONArray, where the value will be a JSONObject which is produced from a Map.
JSONArrayput(int index, Object value)
Put or replace an object value in the JSONArray.
JSONObjecttoJSONObject(JSONArray names)
Produce a JSONObject by combining a JSONArray of names with the values of this JSONArray.
StringtoString()
Make a JSON text of this JSONArray.
StringtoString(int indentFactor)
Make a prettyprinted JSON text of this JSONArray.
Writerwrite(Writer writer)
Write the contents of the JSONArray as JSON text to a writer.

Constructor Detail

JSONArray

public JSONArray()
Construct an empty JSONArray.

JSONArray

public JSONArray(JSONTokener x)
Construct a JSONArray from a JSONTokener.

Parameters: x A JSONTokener

Throws: JSONException If there is a syntax error.

JSONArray

public JSONArray(String string)
Construct a JSONArray from a source sJSON text.

Parameters: string A string that begins with [ (left bracket) and ends with ] (right bracket).

Throws: JSONException If there is a syntax error.

JSONArray

public JSONArray(Collection collection)
Construct a JSONArray from a Collection.

Parameters: collection A Collection.

Method Detail

get

public Object get(int index)
Get the object value associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: An object value.

Throws: JSONException If there is no value for the index.

getBoolean

public boolean getBoolean(int index)
Get the boolean value associated with an index. The string values "true" and "false" are converted to boolean.

Parameters: index The index must be between 0 and length() - 1.

Returns: The truth.

Throws: JSONException If there is no value for the index or if the value is not convertable to boolean.

getDouble

public double getDouble(int index)
Get the double value associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

Throws: JSONException If the key is not found or if the value cannot be converted to a number.

getInt

public int getInt(int index)
Get the int value associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

Throws: JSONException If the key is not found or if the value cannot be converted to a number. if the value cannot be converted to a number.

getJSONArray

public JSONArray getJSONArray(int index)
Get the JSONArray associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: A JSONArray value.

Throws: JSONException If there is no value for the index. or if the value is not a JSONArray

getJSONObject

public JSONObject getJSONObject(int index)
Get the JSONObject associated with an index.

Parameters: index subscript

Returns: A JSONObject value.

Throws: JSONException If there is no value for the index or if the value is not a JSONObject

getLong

public long getLong(int index)
Get the long value associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

Throws: JSONException If the key is not found or if the value cannot be converted to a number.

getString

public String getString(int index)
Get the string associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: A string value.

Throws: JSONException If there is no value for the index.

isNull

public boolean isNull(int index)
Determine if the value is null.

Parameters: index The index must be between 0 and length() - 1.

Returns: true if the value at the index is null, or if there is no value.

join

public String join(String separator)
Make a string from the contents of this JSONArray. The separator string is inserted between each element. Warning: This method assumes that the data structure is acyclical.

Parameters: separator A string that will be inserted between the elements.

Returns: a string.

Throws: JSONException If the array contains an invalid number.

length

public int length()
Get the number of elements in the JSONArray, included nulls.

Returns: The length (or size).

opt

public Object opt(int index)
Get the optional object value associated with an index.

Parameters: index The index must be between 0 and length() - 1.

Returns: An object value, or null if there is no object at that index.

optBoolean

public boolean optBoolean(int index)
Get the optional boolean value associated with an index. It returns false if there is no value at that index, or if the value is not Boolean.TRUE or the String "true".

Parameters: index The index must be between 0 and length() - 1.

Returns: The truth.

optBoolean

public boolean optBoolean(int index, boolean defaultValue)
Get the optional boolean value associated with an index. It returns the defaultValue if there is no value at that index or if it is not a Boolean or the String "true" or "false" (case insensitive).

Parameters: index The index must be between 0 and length() - 1. defaultValue A boolean default.

Returns: The truth.

optDouble

public double optDouble(int index)
Get the optional double value associated with an index. NaN is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

optDouble

public double optDouble(int index, double defaultValue)
Get the optional double value associated with an index. The defaultValue is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index subscript defaultValue The default value.

Returns: The value.

optInt

public int optInt(int index)
Get the optional int value associated with an index. Zero is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

optInt

public int optInt(int index, int defaultValue)
Get the optional int value associated with an index. The defaultValue is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index The index must be between 0 and length() - 1. defaultValue The default value.

Returns: The value.

optJSONArray

public JSONArray optJSONArray(int index)
Get the optional JSONArray associated with an index.

Parameters: index subscript

Returns: A JSONArray value, or null if the index has no value, or if the value is not a JSONArray.

optJSONObject

public JSONObject optJSONObject(int index)
Get the optional JSONObject associated with an index. Null is returned if the key is not found, or null if the index has no value, or if the value is not a JSONObject.

Parameters: index The index must be between 0 and length() - 1.

Returns: A JSONObject value.

optLong

public long optLong(int index)
Get the optional long value associated with an index. Zero is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index The index must be between 0 and length() - 1.

Returns: The value.

optLong

public long optLong(int index, long defaultValue)
Get the optional long value associated with an index. The defaultValue is returned if there is no value for the index, or if the value is not a number and cannot be converted to a number.

Parameters: index The index must be between 0 and length() - 1. defaultValue The default value.

Returns: The value.

optString

public String optString(int index)
Get the optional string value associated with an index. It returns an empty string if there is no value at that index. If the value is not a string and is not null, then it is coverted to a string.

Parameters: index The index must be between 0 and length() - 1.

Returns: A String value.

optString

public String optString(int index, String defaultValue)
Get the optional string associated with an index. The defaultValue is returned if the key is not found.

Parameters: index The index must be between 0 and length() - 1. defaultValue The default value.

Returns: A String value.

put

public JSONArray put(boolean value)
Append a boolean value. This increases the array's length by one.

Parameters: value A boolean value.

Returns: this.

put

public JSONArray put(Collection value)
Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.

Parameters: value A Collection value.

Returns: this.

put

public JSONArray put(double value)
Append a double value. This increases the array's length by one.

Parameters: value A double value.

Returns: this.

Throws: JSONException if the value is not finite.

put

public JSONArray put(int value)
Append an int value. This increases the array's length by one.

Parameters: value An int value.

Returns: this.

put

public JSONArray put(long value)
Append an long value. This increases the array's length by one.

Parameters: value A long value.

Returns: this.

put

public JSONArray put(Map value)
Put a value in the JSONArray, where the value will be a JSONObject which is produced from a Map.

Parameters: value A Map value.

Returns: this.

put

public JSONArray put(Object value)
Append an object value. This increases the array's length by one.

Parameters: value An object value. The value should be a Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.

Returns: this.

put

public JSONArray put(int index, boolean value)
Put or replace a boolean value in the JSONArray. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.

Parameters: index The subscript. value A boolean value.

Returns: this.

Throws: JSONException If the index is negative.

put

public JSONArray put(int index, Collection value)
Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.

Parameters: index The subscript. value A Collection value.

Returns: this.

Throws: JSONException If the index is negative or if the value is not finite.

put

public JSONArray put(int index, double value)
Put or replace a double value. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.

Parameters: index The subscript. value A double value.

Returns: this.

Throws: JSONException If the index is negative or if the value is not finite.

put

public JSONArray put(int index, int value)
Put or replace an int value. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.

Parameters: index The subscript. value An int value.

Returns: this.

Throws: JSONException If the index is negative.

put

public JSONArray put(int index, long value)
Put or replace a long value. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.

Parameters: index The subscript. value A long value.

Returns: this.

Throws: JSONException If the index is negative.

put

public JSONArray put(int index, Map value)
Put a value in the JSONArray, where the value will be a JSONObject which is produced from a Map.

Parameters: index The subscript. value The Map value.

Returns: this.

Throws: JSONException If the index is negative or if the the value is an invalid number.

put

public JSONArray put(int index, Object value)
Put or replace an object value in the JSONArray. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.

Parameters: index The subscript. value The value to put into the array. The value should be a Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the JSONObject.NULL object.

Returns: this.

Throws: JSONException If the index is negative or if the the value is an invalid number.

toJSONObject

public JSONObject toJSONObject(JSONArray names)
Produce a JSONObject by combining a JSONArray of names with the values of this JSONArray.

Parameters: names A JSONArray containing a list of key strings. These will be paired with the values.

Returns: A JSONObject, or null if there are no names or if this JSONArray has no values.

Throws: JSONException If any of the names are null.

toString

public String toString()
Make a JSON text of this JSONArray. For compactness, no unnecessary whitespace is added. If it is not possible to produce a syntactically correct JSON text then null will be returned instead. This could occur if the array contains an invalid number.

Warning: This method assumes that the data structure is acyclical.

Returns: a printable, displayable, transmittable representation of the array.

toString

public String toString(int indentFactor)
Make a prettyprinted JSON text of this JSONArray. Warning: This method assumes that the data structure is acyclical.

Parameters: indentFactor The number of spaces to add to each level of indentation.

Returns: a printable, displayable, transmittable representation of the object, beginning with [ (left bracket) and ending with ] (right bracket).

Throws: JSONException

write

public Writer write(Writer writer)
Write the contents of the JSONArray as JSON text to a writer. For compactness, no whitespace is added.

Warning: This method assumes that the data structure is acyclical.

Returns: The writer.

Throws: JSONException