JSONObject

org.grails.web.json.JSONObject

All Implemented Interfaces and Traits:

JSONElement, java.util.Map
```
@java.lang.SuppressWarnings({ "unchecked", "rawtypes" })
public class JSONObject
extends java.lang.Object
```
A JSONObject is an unordered collection of name/value pairs. Its external form is a string wrapped in curly braces with colons between the names and values, and commas between the values and names. The internal form is an object having get and opt methods for accessing the values by name, and put methods for adding or replacing values by name. The values can be any of these types: Boolean, JSONArray, JSONObject, Number, or String. A JSONObject constructor can be used to convert an external form JSON text into an internal form whose values can be retrieved with the get and opt methods, or to convert values into a JSON text using the put and toString methods. 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 put methods adds values to an object. For example,
```
     myString = new JSONObject().put("JSON", "Hello, World!").toString();
```
produces the string {"JSON": "Hello, World"}.
The texts produced by the toString methods strictly conform to the JSON sysntax rules. The constructors are more forgiving in the texts they will accept:
- An extra , (comma) may appear just before the closing brace.
- Strings may be quoted with ' (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: { } [ ] / \ : , = ; # and if they do not look like numbers and if they are not the reserved words true, false, or null.
- Keys can be followed by = or => as well as by :.
- Values can be followed by ; (semicolon) as well as by , (comma).
- Numbers may have the 0- (octal) or 0x- (hex) prefix.
- Comments written in the slashshlash, slashstar, and hash conventions will be ignored.
Authors:
JSON.org
Version:
2

Constructor Summary

Constructors
Constructor and description
`JSONObject ()` Construct an empty JSONObject.
`JSONObject (JSONObject jo, java.lang.String[] sa)` Construct a JSONObject from a subset of another JSONObject.
`JSONObject (JSONTokener x)` Construct a JSONObject from a JSONTokener.
`JSONObject (java.util.Map map)` Construct a JSONObject from a Map.
`JSONObject (java.lang.String string)` Construct a JSONObject from a string.

Methods Summary

Methods
Type Params	Return Type	Name and description
	`JSONObject`	`accumulate(java.lang.String key, java.lang.Object value)` Accumulate values under a key.
	`void`	`clear()`
	`static java.lang.String`	`collectionToString(java.util.Collection c)`
	`boolean`	`containsKey(java.lang.Object o)`
	`boolean`	`containsValue(java.lang.Object o)`
	`static java.lang.String`	`dateToString(java.util.Date d)`
	`protected static void`	`encodeToWriter(java.lang.CharSequence str, java.io.Writer writer)`
	`java.util.Set`	`entrySet()`
	`boolean`	`equals(java.lang.Object o)`
	`java.lang.Object`	`get(java.lang.String key)` Get the value object associated with a key.
	`java.lang.Object`	`get(java.lang.Object o)`
	`boolean`	`getBoolean(java.lang.String key)` Get the boolean value associated with a key.
	`double`	`getDouble(java.lang.String key)` Get the double value associated with a key.
	`int`	`getInt(java.lang.String key)` Get the int value associated with a key.
	`JSONArray`	`getJSONArray(java.lang.String key)` Get the JSONArray value associated with a key.
	`JSONObject`	`getJSONObject(java.lang.String key)` Get the JSONObject value associated with a key.
	`long`	`getLong(java.lang.String key)` Get the long value associated with a key.
	`java.lang.String`	`getString(java.lang.String key)` Get the string associated with a key.
	`boolean`	`has(java.lang.String key)` Determine if the JSONObject contains a specific key.
	`int`	`hashCode()`
	`boolean`	`isEmpty()`
	`boolean`	`isNull(java.lang.String key)` Determine if the value associated with the key is null or if there is no value.
	`java.util.Set`	`keySet()`
	`java.util.Iterator`	`keys()` Get an enumeration of the keys of the JSONObject.
	`int`	`length()` Get the number of keys stored in the JSONObject.
	`JSONArray`	`names()` Produce a JSONArray containing the names of the elements of this JSONObject.
	`static java.lang.String`	`numberToString(java.lang.Number n)` Produce a string from a number.
	`java.lang.Object`	`opt(java.lang.String key)` Get an optional value associated with a key.
	`boolean`	`optBoolean(java.lang.String key)` Get an optional boolean associated with a key.
	`boolean`	`optBoolean(java.lang.String key, boolean defaultValue)` Get an optional boolean associated with a key.
	`double`	`optDouble(java.lang.String key)` Get an optional double associated with a key, or NaN if there is no such key or if its value is not a number.
	`double`	`optDouble(java.lang.String key, double defaultValue)` Get an optional double associated with a key, or the defaultValue if there is no such key or if its value is not a number.
	`int`	`optInt(java.lang.String key)` Get an optional int value associated with a key, or zero if there is no such key or if the value is not a number.
	`int`	`optInt(java.lang.String key, int defaultValue)` Get an optional int value associated with a key, or the default if there is no such key or if the value is not a number.
	`JSONArray`	`optJSONArray(java.lang.String key)` Get an optional JSONArray associated with a key.
	`JSONObject`	`optJSONObject(java.lang.String key)` Get an optional JSONObject associated with a key.
	`long`	`optLong(java.lang.String key)` Get an optional long value associated with a key, or zero if there is no such key or if the value is not a number.
	`long`	`optLong(java.lang.String key, long defaultValue)` Get an optional long value associated with a key, or the default if there is no such key or if the value is not a number.
	`java.lang.String`	`optString(java.lang.String key)` Get an optional string associated with a key.
	`java.lang.String`	`optString(java.lang.String key, java.lang.String defaultValue)` Get an optional string associated with a key.
	`JSONObject`	`put(java.lang.String key, boolean value)` Put a key/boolean pair in the JSONObject.
	`JSONObject`	`put(java.lang.String key, double value)` Put a key/double pair in the JSONObject.
	`JSONObject`	`put(java.lang.String key, int value)` Put a key/int pair in the JSONObject.
	`JSONObject`	`put(java.lang.String key, long value)` Put a key/long pair in the JSONObject.
	`JSONObject`	`put(java.lang.String key, java.lang.Object value)` Put a key/value pair in the JSONObject.
	`java.lang.Object`	`put(java.lang.Object o, java.lang.Object o1)`
	`void`	`putAll(java.util.Map map)`
	`JSONObject`	`putOpt(java.lang.String key, java.lang.Object value)` Put a key/value pair in the JSONObject, but only if the key and the value are both non-null.
	`static java.lang.String`	`quote(java.lang.String string)` Produce a string in double quotes with backslash sequences in all the right places.
	`java.lang.Object`	`remove(java.lang.String key)` Remove a name and its value, if present.
	`java.lang.Object`	`remove(java.lang.Object o)`
	`int`	`size()`
	`JSONArray`	`toJSONArray(JSONArray names)` Produce a JSONArray containing the values of the members of this JSONObject.
	`java.lang.String`	`toString()` Make an JSON text of this JSONObject.
	`java.lang.String`	`toString(int indentFactor)` Make a prettyprinted JSON text of this JSONObject.
	`java.util.Collection`	`values()`
	`java.io.Writer`	`write(java.io.Writer writer)` Write the contents of the JSONObject as JSON text to a writer.
	`java.io.Writer`	`writeTo(java.io.Writer out)`

Inherited Methods Summary

Inherited Methods
Methods inherited from class	Name
`class java.lang.Object`	`java.lang.Object#wait(long, int), java.lang.Object#wait(long), java.lang.Object#wait(), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()`

- Constructor Detail
  - public JSONObject()
    
    Construct an empty JSONObject.
  - public JSONObject(JSONObject jo, java.lang.String[] sa)
    
    Construct a JSONObject from a subset of another JSONObject. An array of strings is used to identify the keys that should be copied. Missing keys are ignored.
    throws:
    JSONException If a value is a non-finite number.
    
    Parameters:
    jo - A JSONObject.
    sa - An array of strings.
  - public JSONObject(JSONTokener x)
    
    Construct a JSONObject from a JSONTokener.
    throws:
    JSONException If there is a syntax error in the source string.
    
    Parameters:
    x - A JSONTokener object containing the source string.
  - public JSONObject(java.util.Map map)
    
    Construct a JSONObject from a Map.
    Parameters:
    map - A map object that can be used to initialize the contents of the JSONObject.
  - public JSONObject(java.lang.String string)
    
    Construct a JSONObject from a string. This is the most commonly used JSONObject constructor.
    throws:
    JSONException If there is a syntax error in the source string.
    
    Parameters:
    string - A string beginning with { (left brace) and ending with } (right brace).
- Method Detail
  - public JSONObject accumulate(java.lang.String key, java.lang.Object value)
    
    Accumulate values under a key. It is similar to the put method except that if there is already an object stored under the key then a JSONArray is stored under the key to hold all of the accumulated values. If there is already a JSONArray, then the new value is appended to it. In contrast, the put method replaces the previous value.
    throws:
    JSONException If the value is an invalid number or if the key is null.
    
    Parameters:
    key - A key string.
    value - An object to be accumulated under the key.
    Returns:
    this
  - public void clear()
  - public static java.lang.String collectionToString(java.util.Collection c)
  - public boolean containsKey(java.lang.Object o)
  - public boolean containsValue(java.lang.Object o)
  - public static java.lang.String dateToString(java.util.Date d)
  - protected static void encodeToWriter(java.lang.CharSequence str, java.io.Writer writer)
  - public java.util.Set entrySet()
  - @java.lang.Override public boolean equals(java.lang.Object o)
  - public java.lang.Object get(java.lang.String key)
    
    Get the value object associated with a key.
    throws:
    JSONException if the key is not found.
    
    Parameters:
    key - A key string.
    Returns:
    The object associated with the key.
  - public java.lang.Object get(java.lang.Object o)
  - public boolean getBoolean(java.lang.String key)
    
    Get the boolean value associated with a key.
    throws:
    JSONException if the value is not a Boolean or the String "true" or "false".
    
    Parameters:
    key - A key string.
    Returns:
    The truth.
  - public double getDouble(java.lang.String key)
    
    Get the double value associated with a key.
    throws:
    JSONException if the key is not found or if the value is not a Number object and cannot be converted to a number.
    
    Parameters:
    key - A key string.
    Returns:
    The numeric value.
  - public int getInt(java.lang.String key)
    
    Get the int value associated with a key. If the number value is too large for an int, it will be clipped.
    throws:
    JSONException if the key is not found or if the value cannot be converted to an integer.
    
    Parameters:
    key - A key string.
    Returns:
    The integer value.
  - public JSONArray getJSONArray(java.lang.String key)
    
    Get the JSONArray value associated with a key.
    throws:
    JSONException if the key is not found or if the value is not a JSONArray.
    
    Parameters:
    key - A key string.
    Returns:
    A JSONArray which is the value.
  - public JSONObject getJSONObject(java.lang.String key)
    
    Get the JSONObject value associated with a key.
    throws:
    JSONException if the key is not found or if the value is not a JSONObject.
    
    Parameters:
    key - A key string.
    Returns:
    A JSONObject which is the value.
  - public long getLong(java.lang.String key)
    
    Get the long value associated with a key. If the number value is too long for a long, it will be clipped.
    throws:
    JSONException if the key is not found or if the value cannot be converted to a long.
    
    Parameters:
    key - A key string.
    Returns:
    The long value.
  - public java.lang.String getString(java.lang.String key)
    
    Get the string associated with a key.
    throws:
    JSONException if the key is not found.
    
    Parameters:
    key - A key string.
    Returns:
    A string which is the value.
  - public boolean has(java.lang.String key)
    
    Determine if the JSONObject contains a specific key.
    Parameters:
    key - A key string.
    Returns:
    true if the key exists in the JSONObject.
  - @java.lang.Override public int hashCode()
  - public boolean isEmpty()
  - public boolean isNull(java.lang.String key)
    
    Determine if the value associated with the key is null or if there is no value.
    Parameters:
    key - A key string.
    Returns:
    true if there is no value associated with the key or if the value is the JSONObject.NULL object.
  - public java.util.Set keySet()
  - public java.util.Iterator keys()
    
    Get an enumeration of the keys of the JSONObject.
    Returns:
    An iterator of the keys.
  - public int length()
    
    Get the number of keys stored in the JSONObject.
    Returns:
    The number of keys in the JSONObject.
  - public JSONArray names()
    
    Produce a JSONArray containing the names of the elements of this JSONObject.
    Returns:
    A JSONArray containing the key strings, or null if the JSONObject is empty.
  - public static java.lang.String numberToString(java.lang.Number n)
    
    Produce a string from a number.
    throws:
    JSONException If n is a non-finite number.
    
    Parameters:
    n - A Number
    Returns:
    A String.
  - public java.lang.Object opt(java.lang.String key)
    
    Get an optional value associated with a key.
    Parameters:
    key - A key string.
    Returns:
    An object which is the value, or null if there is no value.
  - public boolean optBoolean(java.lang.String key)
    
    Get an optional boolean associated with a key. It returns false if there is no such key, or if the value is not Boolean.TRUE or the String "true".
    Parameters:
    key - A key string.
    Returns:
    The truth.
  - public boolean optBoolean(java.lang.String key, boolean defaultValue)
    
    Get an optional boolean associated with a key. It returns the defaultValue if there is no such key, or if it is not a Boolean or the String "true" or "false" (case insensitive).
    Parameters:
    key - A key string.
    defaultValue - The default.
    Returns:
    The truth.
  - public double optDouble(java.lang.String key)
    
    Get an optional double associated with a key, or NaN if there is no such key or if its value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A string which is the key.
    Returns:
    An object which is the value.
  - public double optDouble(java.lang.String key, double defaultValue)
    
    Get an optional double associated with a key, or the defaultValue if there is no such key or if its value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A key string.
    defaultValue - The default.
    Returns:
    An object which is the value.
  - public int optInt(java.lang.String key)
    
    Get an optional int value associated with a key, or zero if there is no such key or if the value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A key string.
    Returns:
    An object which is the value.
  - public int optInt(java.lang.String key, int defaultValue)
    
    Get an optional int value associated with a key, or the default if there is no such key or if the value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A key string.
    defaultValue - The default.
    Returns:
    An object which is the value.
  - public JSONArray optJSONArray(java.lang.String key)
    
    Get an optional JSONArray associated with a key. It returns null if there is no such key, or if its value is not a JSONArray.
    Parameters:
    key - A key string.
    Returns:
    A JSONArray which is the value.
  - public JSONObject optJSONObject(java.lang.String key)
    
    Get an optional JSONObject associated with a key. It returns null if there is no such key, or if its value is not a JSONObject.
    Parameters:
    key - A key string.
    Returns:
    A JSONObject which is the value.
  - public long optLong(java.lang.String key)
    
    Get an optional long value associated with a key, or zero if there is no such key or if the value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A key string.
    Returns:
    An object which is the value.
  - public long optLong(java.lang.String key, long defaultValue)
    
    Get an optional long value associated with a key, or the default if there is no such key or if the value is not a number. If the value is a string, an attempt will be made to evaluate it as a number.
    Parameters:
    key - A key string.
    defaultValue - The default.
    Returns:
    An object which is the value.
  - public java.lang.String optString(java.lang.String key)
    
    Get an optional string associated with a key. It returns an empty string if there is no such key. If the value is not a string and is not null, then it is coverted to a string.
    Parameters:
    key - A key string.
    Returns:
    A string which is the value.
  - public java.lang.String optString(java.lang.String key, java.lang.String defaultValue)
    
    Get an optional string associated with a key. It returns the defaultValue if there is no such key.
    Parameters:
    key - A key string.
    defaultValue - The default.
    Returns:
    A string which is the value.
  - public JSONObject put(java.lang.String key, boolean value)
    
    Put a key/boolean pair in the JSONObject.
    throws:
    JSONException If the key is null.
    
    Parameters:
    key - A key string.
    value - A boolean which is the value.
    Returns:
    this
  - public JSONObject put(java.lang.String key, double value)
    
    Put a key/double pair in the JSONObject.
    throws:
    JSONException If the key is null or if the number is invalid.
    
    Parameters:
    key - A key string.
    value - A double which is the value.
    Returns:
    this
  - public JSONObject put(java.lang.String key, int value)
    
    Put a key/int pair in the JSONObject.
    throws:
    JSONException If the key is null.
    
    Parameters:
    key - A key string.
    value - An int which is the value.
    Returns:
    this
  - public JSONObject put(java.lang.String key, long value)
    
    Put a key/long pair in the JSONObject.
    throws:
    JSONException If the key is null.
    
    Parameters:
    key - A key string.
    value - A long which is the value.
    Returns:
    this
  - public JSONObject put(java.lang.String key, java.lang.Object value)
    
    Put a key/value pair in the JSONObject. If the value is null, then the key will be removed from the JSONObject if it is present.
    throws:
    JSONException If the value is non-finite number or if the key is null.
    
    Parameters:
    key - A key string.
    value - An object which is the value. It should be of one of these types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String, or the JSONObject.NULL object.
    Returns:
    this
  - public java.lang.Object put(java.lang.Object o, java.lang.Object o1)
  - public void putAll(java.util.Map map)
  - public JSONObject putOpt(java.lang.String key, java.lang.Object value)
    
    Put a key/value pair in the JSONObject, but only if the key and the value are both non-null.
    throws:
    JSONException If the value is a non-finite number.
    
    Parameters:
    key - A key string.
    value - An object which is the value. It should be of one of these types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String, or the JSONObject.NULL object.
    Returns:
    this
  - public static java.lang.String quote(java.lang.String string)
    
    Produce a string in double quotes with backslash sequences in all the right places. A backslash will be inserted within
    Parameters:
    string - A String
    Returns:
    A String correctly formatted for insertion in a JSON text.
  - public java.lang.Object remove(java.lang.String key)
    
    Remove a name and its value, if present.
    Parameters:
    key - The name to be removed.
    Returns:
    The value that was associated with the name, or null if there was no value.
  - public java.lang.Object remove(java.lang.Object o)
  - public int size()
  - public JSONArray toJSONArray(JSONArray names)
    
    Produce a JSONArray containing the values of the members of this JSONObject.
    throws:
    JSONException If any of the values are non-finite numbers.
    
    Parameters:
    names - A JSONArray containing a list of key strings. This determines the sequence of the values in the result.
    Returns:
    A JSONArray of values.
  - @java.lang.Override public java.lang.String toString()
    
    Make an JSON text of this JSONObject. For compactness, no whitespace is added. If this would not result in a syntactically correct JSON text, then null will be returned instead.
    Warning: This method assumes that the data structure is acyclical.
    Returns:
    a printable, displayable, portable, transmittable representation of the object, beginning with { (left brace) and ending with } (right brace).
  - public java.lang.String toString(int indentFactor)
    
    Make a prettyprinted JSON text of this JSONObject.
    Warning: This method assumes that the data structure is acyclical.
    throws:
    JSONException If the object contains an invalid number.
    
    Parameters:
    indentFactor - The number of spaces to add to each level of indentation.
    Returns:
    a printable, displayable, portable, transmittable representation of the object, beginning with { (left brace) and ending with } (right brace).
  - public java.util.Collection values()
  - public java.io.Writer write(java.io.Writer writer)
    
    Write the contents of the JSONObject as JSON text to a writer. For compactness, no whitespace is added.
    Warning: This method assumes that the data structure is acyclical.
    throws:
    JSONException
    
    Returns:
    The writer.
  - @java.lang.Override public java.io.Writer writeTo(java.io.Writer out)

Summary:
Constructor
Method

| Detail:
Constructor
Method

[Java] Class JSONObject

Constructor Summary

Methods Summary

Inherited Methods Summary

Constructor Detail

public JSONObject()

public JSONObject(JSONObject jo, java.lang.String[] sa)

public JSONObject(JSONTokener x)

public JSONObject(java.util.Map map)

public JSONObject(java.lang.String string)

Method Detail

public JSONObject accumulate(java.lang.String key, java.lang.Object value)

public void clear()

public static java.lang.String collectionToString(java.util.Collection c)

public boolean containsKey(java.lang.Object o)

public boolean containsValue(java.lang.Object o)

public static java.lang.String dateToString(java.util.Date d)

protected static void encodeToWriter(java.lang.CharSequence str, java.io.Writer writer)

public java.util.Set entrySet()

@java.lang.Override public boolean equals(java.lang.Object o)

public java.lang.Object get(java.lang.String key)

public java.lang.Object get(java.lang.Object o)

public boolean getBoolean(java.lang.String key)

public double getDouble(java.lang.String key)

public int getInt(java.lang.String key)

public JSONArray getJSONArray(java.lang.String key)

public JSONObject getJSONObject(java.lang.String key)

public long getLong(java.lang.String key)

public java.lang.String getString(java.lang.String key)

public boolean has(java.lang.String key)

@java.lang.Override public int hashCode()

public boolean isEmpty()

public boolean isNull(java.lang.String key)

public java.util.Set keySet()

public java.util.Iterator keys()

public int length()

public JSONArray names()

public static java.lang.String numberToString(java.lang.Number n)

public java.lang.Object opt(java.lang.String key)

public boolean optBoolean(java.lang.String key)

public boolean optBoolean(java.lang.String key, boolean defaultValue)

public double optDouble(java.lang.String key)

public double optDouble(java.lang.String key, double defaultValue)

public int optInt(java.lang.String key)

public int optInt(java.lang.String key, int defaultValue)

public JSONArray optJSONArray(java.lang.String key)

public JSONObject optJSONObject(java.lang.String key)

public long optLong(java.lang.String key)

public long optLong(java.lang.String key, long defaultValue)

public java.lang.String optString(java.lang.String key)

public java.lang.String optString(java.lang.String key, java.lang.String defaultValue)

public JSONObject put(java.lang.String key, boolean value)

public JSONObject put(java.lang.String key, double value)

public JSONObject put(java.lang.String key, int value)

public JSONObject put(java.lang.String key, long value)

public JSONObject put(java.lang.String key, java.lang.Object value)

public java.lang.Object put(java.lang.Object o, java.lang.Object o1)

public void putAll(java.util.Map map)

public JSONObject putOpt(java.lang.String key, java.lang.Object value)

public static java.lang.String quote(java.lang.String string)

public java.lang.Object remove(java.lang.String key)

public java.lang.Object remove(java.lang.Object o)

public int size()

public JSONArray toJSONArray(JSONArray names)

@java.lang.Override public java.lang.String toString()

public java.lang.String toString(int indentFactor)

public java.util.Collection values()

public java.io.Writer write(java.io.Writer writer)

@java.lang.Override public java.io.Writer writeTo(java.io.Writer out)