JSONArray (twitter4j-core 4.0.6 API)

java.lang.Object
- twitter4j.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{/code} and opt{/code} methods for accessing the values by index, and put{/code} methods for adding or replacing values. The values can be any of these types: Boolean{/code}, JSONArray{/code}, JSONObject{/code}, Number{/code}, String{/code}, or the JSONObject.NULL object{/code}.
The constructor can convert a JSON text into a Java object. The toString{/code} method converts to JSON text.
A get{/code} method returns a value if one can be found, and throws an exception if one cannot be found. An opt{/code} method returns a default value instead of throwing an exception, and so is useful for obtaining optional values.
The generic get(){/code} and opt(){/code} methods return an object which you can cast or query for type. There are also typed get{/code} and opt{/code} methods that do type checking and type coercion for you.
The texts produced by the toString{/code} methods strictly conform to JSON syntax rules. The constructors are more forgiving in the texts they will accept:
- An extra ,{/code} (comma) may appear just before the closing bracket.
- The null{/code} value will be inserted when there is ,{/code} (comma) elision.
- Strings may be quoted with '{/code} (single quote).
- Strings do not need to be quoted at all if they do not begin with a quote or single quote, and if they do not contain leading or trailing spaces, and if they do not contain any of these characters: { } [ ] / \ : , = ; #{/code} and if they do not look like numbers and if they are not the reserved words true{/code}, false{/code}, or null{/code}.
- Values can be separated by ;{/code} (semicolon) as well as by ,{/code} (comma).
- Numbers may have the 0x-{/code} (hex) prefix.
Version:

2010-12-28

Author:

JSON.org

Constructor Summary

Constructors
Constructor and Description
`JSONArray()` Construct an empty JSONArray.
`JSONArray(Collection collection)` Construct a JSONArray from a Collection.
`JSONArray(JSONTokener x)` Construct a JSONArray from a JSONTokener.
`JSONArray(Object array)` Construct a JSONArray from an array
`JSONArray(String source)` Construct a JSONArray from a source JSON text.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Object`	`get(int index)` Get the object value associated with an index.
`boolean`	`getBoolean(int index)` Get the boolean value associated with an index.
`double`	`getDouble(int index)` Get the double value associated with an index.
`int`	`getInt(int index)` Get the int value associated with an index.
`JSONArray`	`getJSONArray(int index)` Get the JSONArray associated with an index.
`JSONObject`	`getJSONObject(int index)` Get the JSONObject associated with an index.
`long`	`getLong(int index)` Get the long value associated with an index.
`String`	`getString(int index)` Get the string associated with an index.
`boolean`	`isNull(int index)` Determine if the value is null.
`String`	`join(String separator)` Make a string from the contents of this JSONArray.
`int`	`length()` Get the number of elements in the JSONArray, included nulls.
`Object`	`opt(int index)` Get the optional object value associated with an index.
`JSONArray`	`put(boolean value)` Append a boolean value.
`JSONArray`	`put(Collection value)` Put a value in the JSONArray, where the value will be a JSONArray which is produced from a Collection.
`JSONArray`	`put(int value)` Append an int value.
`JSONArray`	`put(int index, boolean value)` Put or replace a boolean value in the JSONArray.
`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.
`JSONArray`	`put(int index, double value)` Put or replace a double value.
`JSONArray`	`put(int index, int value)` Put or replace an int value.
`JSONArray`	`put(int index, long value)` Put or replace a long value.
`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.
`JSONArray`	`put(int index, Object value)` Put or replace an object value in the JSONArray.
`JSONArray`	`put(long value)` Append an long value.
`JSONArray`	`put(Map value)` Put a value in the JSONArray, where the value will be a JSONObject which is produced from a Map.
`JSONArray`	`put(Object value)` Append an object value.
`String`	`toString()` Make a JSON text of this JSONArray.
`String`	`toString(int indentFactor)` Make a prettyprinted JSON text of this JSONArray.
`Writer`	`write(Writer writer)` Write the contents of the JSONArray as JSON text to a writer.

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

- Constructor Detail
  - JSONArray
```
public JSONArray()
```
    Construct an empty JSONArray.
  - JSONArray
```
public JSONArray(JSONTokener x)
          throws JSONException
```
    Construct a JSONArray from a JSONTokener.
    
    Parameters:
    
    x - A JSONTokener
    
    Throws:
    
    JSONException - If there is a syntax error.
  - JSONArray
```
public JSONArray(String source)
          throws JSONException
```
    Construct a JSONArray from a source JSON text.
    
    Parameters:
    
    source - A string that begins with [{/code} (left bracket) and ends with ]{/code} (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.
  - JSONArray
```
public JSONArray(Object array)
          throws JSONException
```
    Construct a JSONArray from an array
    
    Parameters:
    
    array - array
    
    Throws:
    
    JSONException - If not an array.
- Method Detail
  - get
```
public Object get(int index)
           throws JSONException
```
    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)
                   throws JSONException
```
    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 convertible to boolean.
  - getDouble
```
public double getDouble(int index)
                 throws JSONException
```
    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)
           throws JSONException
```
    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 is not a number.
  - getJSONArray
```
public JSONArray getJSONArray(int index)
                       throws JSONException
```
    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)
                         throws JSONException
```
    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)
             throws JSONException
```
    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)
                 throws JSONException
```
    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)
            throws JSONException
```
    Make a string from the contents of this JSONArray. The separator{/code} 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.
  - 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(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)
              throws JSONException
```
    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)
              throws JSONException
```
    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)
              throws JSONException
```
    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)
              throws JSONException
```
    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)
              throws JSONException
```
    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)
              throws JSONException
```
    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)
              throws JSONException
```
    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.
  - 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.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a printable, displayable, transmittable representation of the array.
  - toString
```
public String toString(int indentFactor)
                throws JSONException
```
    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 [{/code} (left bracket) and ending with ]{/code} (right bracket).
    
    Throws:
    
    JSONException - when failed to stringify
  - write
```
public Writer write(Writer writer)
             throws JSONException
```
    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.
    
    Parameters:
    
    writer - writer
    
    Returns:
    
    The writer.
    
    Throws:
    
    JSONException - when failed to write the content

Class JSONArray

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

JSONArray

JSONArray

JSONArray

JSONArray

JSONArray

Method Detail

get

getBoolean

getDouble

getInt

getJSONArray

getJSONObject

getLong

getString

isNull

join

length

opt

put

put

put

put

put

put

put

put

put

put

put

put

put

toString

toString

write