JsonArray (cat-client 3.0.1 API)

java.lang.Object
- com.dianping.cat.util.json.JsonArray

```
public class JsonArray
extends Object
```
A JSONArray is an ordered sequence of values. Its external form is a string wrapped in square brackets with commas between 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 external form string into an internal form Java object. The toString() method creates an external form string.
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 typing checking and type coersion for you.
The texts produced by the toString() methods are very strict. The constructors are more forgiving in the texts they will accept.
- An extra , (comma) may appear just before the closing bracket.
- The null value will be inserted when there is , (comma) elision.
- 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.
- Values can be followed by ; as well as by ,
- Numbers may have the 0- (octal) or 0x- (hex) prefix.
- Line comments can begin with #
版本:

1

作者:

JSON.org

构造器概要

构造器
构造器和说明
`JsonArray()` Construct an empty JSONArray.
`JsonArray(Collection<Object> collection)` Construct a JSONArray from a Collection.
`JsonArray(JsonTokener x)` Construct a JSONArray from a JSONTokener.
`JsonArray(String string)` Construct a JSONArray from a source string.

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`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.
`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 length of the JSONArray.
`Object`	`opt(int index)` Get the optional object value associated with an index.
`boolean`	`optBoolean(int index)` Get the optional boolean value associated with an index.
`boolean`	`optBoolean(int index, boolean defaultValue)` Get the optional boolean value associated with an index.
`double`	`optDouble(int index)` Get the optional double value associated with an index.
`double`	`optDouble(int index, double defaultValue)` Get the optional double value associated with an index.
`int`	`optInt(int index)` Get the optional int value associated with an index.
`int`	`optInt(int index, int defaultValue)` Get the optional int value associated with an index.
`JsonArray`	`optJSONArray(int index)` Get the optional JSONArray associated with an index.
`JsonObject`	`optJSONObject(int index)` Get the optional JSONObject associated with an index.
`String`	`optString(int index)` Get the optional string value associated with an index.
`String`	`optString(int index, String defaultValue)` Get the optional string associated with an index.
`JsonArray`	`put(boolean value)` Append a boolean value.
`JsonArray`	`put(double value)` Append a double value.
`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, double value)` Put or replace a double value.
`JsonArray`	`put(int index, int value)` Put or replace an int value.
`JsonArray`	`put(int index, Object value)` Put or replace an object value in the JSONArray.
`JsonArray`	`put(Object value)` Append an object value.
`JsonObject`	`toJSONObject(JsonArray names)` Produce a JSONObject by combining a JSONArray of names with the values of this JSONArray.
`String`	`toString()` Make an JSON external form string of this JSONArray.
`String`	`toString(int indentFactor)` Make a prettyprinted JSON string of this JSONArray.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - JsonArray
```
public JsonArray()
```
    Construct an empty JSONArray.
  - JsonArray
```
public JsonArray(JsonTokener x)
          throws ParseException
```
    Construct a JSONArray from a JSONTokener.
    
    参数:
    
    x - A JSONTokener
    
    抛出:
    
    ParseException - A JSONArray must start with '['
    
    ParseException - Expected a ',' or ']'
  - JsonArray
```
public JsonArray(String string)
          throws ParseException
```
    Construct a JSONArray from a source string.
    
    参数:
    
    string - A string that begins with [ (left bracket) and ends with ] (right bracket).
    
    抛出:
    
    ParseException - The string must conform to JSON syntax.
  - JsonArray
```
public JsonArray(Collection<Object> collection)
```
    Construct a JSONArray from a Collection.
    
    参数:
    
    collection - A Collection.
- 方法详细资料
  - get
```
public Object get(int index)
           throws NoSuchElementException
```
    Get the object value associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    An object value.
    
    抛出:
    
    NoSuchElementException
  - getBoolean
```
public boolean getBoolean(int index)
                   throws ClassCastException,
                          NoSuchElementException
```
    Get the boolean value associated with an index. The string values "true" and "false" are converted to boolean.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    The truth.
    
    抛出:
    
    NoSuchElementException - if the index is not found
    
    ClassCastException
  - getDouble
```
public double getDouble(int index)
                 throws NoSuchElementException,
                        NumberFormatException
```
    Get the double value associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    The value.
    
    抛出:
    
    NoSuchElementException - if the key is not found
    
    NumberFormatException - if the value cannot be converted to a number.
  - getInt
```
public int getInt(int index)
           throws NoSuchElementException,
                  NumberFormatException
```
    Get the int value associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    The value.
    
    抛出:
    
    NoSuchElementException - if the key is not found
    
    NumberFormatException - if the value cannot be converted to a number.
  - getJSONArray
```
public JsonArray getJSONArray(int index)
                       throws NoSuchElementException
```
    Get the JSONArray associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    A JSONArray value.
    
    抛出:
    
    NoSuchElementException - if the index is not found or if the value is not a JSONArray
  - getJSONObject
```
public JsonObject getJSONObject(int index)
                         throws NoSuchElementException
```
    Get the JSONObject associated with an index.
    
    参数:
    
    index - subscript
    
    返回:
    
    A JSONObject value.
    
    抛出:
    
    NoSuchElementException - if the index is not found or if the value is not a JSONObject
  - getString
```
public String getString(int index)
                 throws NoSuchElementException
```
    Get the string associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    A string value.
    
    抛出:
    
    NoSuchElementException
  - isNull
```
public boolean isNull(int index)
```
    Determine if the value is null.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    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.
    
    参数:
    
    separator - A string that will be inserted between the elements.
    
    返回:
    
    a string.
  - length
```
public int length()
```
    Get the length of the JSONArray.
    
    返回:
    
    The length (or size).
  - opt
```
public Object opt(int index)
```
    Get the optional object value associated with an index.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    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".
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    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).
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    defaultValue - A boolean default.
    
    返回:
    
    The truth.
  - optDouble
```
public double optDouble(int index)
```
    Get the optional double value associated with an index. NaN is returned if the index is not found, or if the value is not a number and cannot be converted to a number.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    The value.
  - optDouble
```
public double optDouble(int index,
                        double defaultValue)
```
    Get the optional double value associated with an index. The defaultValue is returned if the index is not found, or if the value is not a number and cannot be converted to a number.
    
    参数:
    
    index - subscript
    
    defaultValue - The default value.
    
    返回:
    
    The value.
  - optInt
```
public int optInt(int index)
```
    Get the optional int value associated with an index. Zero is returned if the index is not found, or if the value is not a number and cannot be converted to a number.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    The value.
  - optInt
```
public int optInt(int index,
                  int defaultValue)
```
    Get the optional int value associated with an index. The defaultValue is returned if the index is not found, or if the value is not a number and cannot be converted to a number.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    defaultValue - The default value.
    
    返回:
    
    The value.
  - optJSONArray
```
public JsonArray optJSONArray(int index)
```
    Get the optional JSONArray associated with an index.
    
    参数:
    
    index - subscript
    
    返回:
    
    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.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    A JSONObject 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.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    返回:
    
    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.
    
    参数:
    
    index - The index must be between 0 and length() - 1.
    
    defaultValue - The default value.
    
    返回:
    
    A String value.
  - put
```
public JsonArray put(boolean value)
```
    Append a boolean value.
    
    参数:
    
    value - A boolean value.
    
    返回:
    
    this.
  - put
```
public JsonArray put(double value)
```
    Append a double value.
    
    参数:
    
    value - A double value.
    
    返回:
    
    this.
  - put
```
public JsonArray put(int value)
```
    Append an int value.
    
    参数:
    
    value - An int value.
    
    返回:
    
    this.
  - put
```
public JsonArray put(Object value)
```
    Append an object value.
    
    参数:
    
    value - An object value. The value should be a Boolean, Double, Integer, JSONArray, JSObject, or String, or the JSONObject.NULL object.
    
    返回:
    
    this.
  - put
```
public JsonArray put(int index,
                     boolean value)
```
    Put or replace a boolean value in the JSONArray.
    
    参数:
    
    index - subscript The subscript. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.
    
    value - A boolean value.
    
    返回:
    
    this.
    
    抛出:
    
    NoSuchElementException - The index must not be negative.
  - put
```
public JsonArray put(int index,
                     double value)
```
    Put or replace a double value.
    
    参数:
    
    index - subscript The subscript. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.
    
    value - A double value.
    
    返回:
    
    this.
    
    抛出:
    
    NoSuchElementException - The index must not be negative.
  - put
```
public JsonArray put(int index,
                     int value)
```
    Put or replace an int value.
    
    参数:
    
    index - subscript The subscript. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.
    
    value - An int value.
    
    返回:
    
    this.
    
    抛出:
    
    NoSuchElementException - The index must not be negative.
  - put
```
public JsonArray put(int index,
                     Object value)
              throws NoSuchElementException,
                     NullPointerException
```
    Put or replace an object value in the JSONArray.
    
    参数:
    
    index - The subscript. If the index is greater than the length of the JSONArray, then null elements will be added as necessary to pad it out.
    
    value - An object value.
    
    返回:
    
    this.
    
    抛出:
    
    NoSuchElementException - The index must not be negative.
    
    NullPointerException - The index must not be null.
  - toJSONObject
```
public JsonObject toJSONObject(JsonArray names)
```
    Produce a JSONObject by combining a JSONArray of names with the values of this JSONArray.
    
    参数:
    
    names - A JSONArray containing a list of key strings. These will be paired with the values.
    
    返回:
    
    A JSONObject, or null if there are no names or if this JSONArray has no values.
  - toString
```
public String toString()
```
    Make an JSON external form string of this JSONArray. For compactness, no unnecessary whitespace is added. Warning: This method assumes that the data structure is acyclical.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a printable, displayable, transmittable representation of the array.
  - toString
```
public String toString(int indentFactor)
```
    Make a prettyprinted JSON string of this JSONArray. Warning: This method assumes that the data structure is non-cyclical.
    
    参数:
    
    indentFactor - The number of spaces to add to each level of indentation.
    
    返回:
    
    a printable, displayable, transmittable representation of the object, beginning with [ (left bracket) and ending with ] (right bracket).

类 JsonArray

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

JsonArray

JsonArray

JsonArray

JsonArray

方法详细资料

get

getBoolean

getDouble

getInt

getJSONArray

getJSONObject

getString

isNull

join

length

opt

optBoolean

optBoolean

optDouble

optDouble

optInt

optInt

optJSONArray

optJSONObject

optString

optString

put

put

put

put

put

put

put

put

toJSONObject

toString

toString