java.lang.Object
- com.google.gson.stream.JsonReader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

JsonTreeReader
```
public class JsonReader
extends java.lang.Object
implements java.io.Closeable
```
Reads a JSON (RFC 8259) encoded value as a stream of tokens. This stream includes both literal values (strings, numbers, booleans, and nulls) as well as the begin and end delimiters of objects and arrays. The tokens are traversed in depth-first order, the same order that they appear in the JSON document. Within JSON objects, name/value pairs are represented by a single token.
Parsing JSON
To create a recursive descent parser for your own JSON streams, first create an entry point method that creates a JsonReader.
Next, create handler methods for each structure in your JSON text. You'll need a method for each object type and for each array type.
- Within array handling methods, first call beginArray() to consume the array's opening bracket. Then create a while loop that accumulates values, terminating when hasNext() is false. Finally, read the array's closing bracket by calling endArray().
- Within object handling methods, first call beginObject() to consume the object's opening brace. Then create a while loop that assigns values to local variables based on their name. This loop should terminate when hasNext() is false. Finally, read the object's closing brace by calling endObject().
When a nested object or array is encountered, delegate to the corresponding handler method.
When an unknown name is encountered, strict parsers should fail with an exception. Lenient parsers should call skipValue() to recursively skip the value's nested tokens, which may otherwise conflict.
If a value may be null, you should first check using peek(). Null literals can be consumed using either nextNull() or skipValue().
Configuration
The behavior of this reader can be customized with the following methods:
- setStrictness(Strictness), the default is Strictness.LEGACY_STRICT
- setNestingLimit(int), the default is 255
The default configuration of JsonReader instances used internally by the Gson class differs, and can be adjusted with the various GsonBuilder methods.
Example
Suppose we'd like to parse a stream of messages such as the following:
```
 [
   {
     "id": 912345678901,
     "text": "How do I read a JSON stream in Java?",
     "geo": null,
     "user": {
       "name": "json_newb",
       "followers_count": 41
      }
   },
   {
     "id": 912345678902,
     "text": "@json_newb just use JsonReader!",
     "geo": [50.454722, -104.606667],
     "user": {
       "name": "jesse",
       "followers_count": 2
     }
   }
 ]
 
```
This code implements the parser for the above structure:
```
 public List<Message> readJsonStream(InputStream in) throws IOException {
   JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
   try {
     return readMessagesArray(reader);
   } finally {
     reader.close();
   }
 }

 public List<Message> readMessagesArray(JsonReader reader) throws IOException {
   List<Message> messages = new ArrayList<>();

   reader.beginArray();
   while (reader.hasNext()) {
     messages.add(readMessage(reader));
   }
   reader.endArray();
   return messages;
 }

 public Message readMessage(JsonReader reader) throws IOException {
   long id = -1;
   String text = null;
   User user = null;
   List<Double> geo = null;

   reader.beginObject();
   while (reader.hasNext()) {
     String name = reader.nextName();
     if (name.equals("id")) {
       id = reader.nextLong();
     } else if (name.equals("text")) {
       text = reader.nextString();
     } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) {
       geo = readDoublesArray(reader);
     } else if (name.equals("user")) {
       user = readUser(reader);
     } else {
       reader.skipValue();
     }
   }
   reader.endObject();
   return new Message(id, text, user, geo);
 }

 public List<Double> readDoublesArray(JsonReader reader) throws IOException {
   List<Double> doubles = new ArrayList<>();

   reader.beginArray();
   while (reader.hasNext()) {
     doubles.add(reader.nextDouble());
   }
   reader.endArray();
   return doubles;
 }

 public User readUser(JsonReader reader) throws IOException {
   String username = null;
   int followersCount = -1;

   reader.beginObject();
   while (reader.hasNext()) {
     String name = reader.nextName();
     if (name.equals("name")) {
       username = reader.nextString();
     } else if (name.equals("followers_count")) {
       followersCount = reader.nextInt();
     } else {
       reader.skipValue();
     }
   }
   reader.endObject();
   return new User(username, followersCount);
 }
 
```
Number Handling
This reader permits numeric values to be read as strings and string values to be read as numbers. For example, both elements of the JSON array [1, "1"] may be read using either nextInt() or nextString(). This behavior is intended to prevent lossy numeric conversions: double is JavaScript's only numeric type and very large values like 9007199254740993 cannot be represented exactly on that platform. To minimize precision loss, extremely large values should be written and read as strings in JSON.
Non-Execute Prefix
Web servers that serve private data using JSON may be vulnerable to Cross-site request forgery attacks. In such an attack, a malicious site gains access to a private JSON file by executing it with an HTML <script> tag.
Prefixing JSON files with ")]}'\n" makes them non-executable by <script> tags, disarming the attack. Since the prefix is malformed JSON, strict parsing fails when it is encountered. This class permits the non-execute prefix when lenient parsing is enabled.
Each JsonReader may be used to read a single JSON stream. Instances of this class are not thread safe.
Since:

1.6

Field Summary

Fields
Modifier and Type	Field	Description
`private char[]`	`buffer`	Use a manual buffer to easily read and unread upcoming characters, and also so we can create strings without an intermediate StringBuilder.
`(package private) static int`	`BUFFER_SIZE`
`(package private) static int`	`DEFAULT_NESTING_LIMIT`
`private java.io.Reader`	`in`	The input JSON.
`private int`	`limit`
`private int`	`lineNumber`
`private int`	`lineStart`
`private static long`	`MIN_INCOMPLETE_INTEGER`
`private int`	`nestingLimit`
`private static int`	`NUMBER_CHAR_DECIMAL`
`private static int`	`NUMBER_CHAR_DIGIT`
`private static int`	`NUMBER_CHAR_EXP_DIGIT`
`private static int`	`NUMBER_CHAR_EXP_E`
`private static int`	`NUMBER_CHAR_EXP_SIGN`
`private static int`	`NUMBER_CHAR_FRACTION_DIGIT`
`private static int`	`NUMBER_CHAR_NONE`
`private static int`	`NUMBER_CHAR_SIGN`
`private int[]`	`pathIndices`
`private java.lang.String[]`	`pathNames`
`(package private) int`	`peeked`
`private static int`	`PEEKED_BEGIN_ARRAY`
`private static int`	`PEEKED_BEGIN_OBJECT`
`private static int`	`PEEKED_BUFFERED`	When this is returned, the string value is stored in peekedString.
`private static int`	`PEEKED_DOUBLE_QUOTED`
`private static int`	`PEEKED_DOUBLE_QUOTED_NAME`
`private static int`	`PEEKED_END_ARRAY`
`private static int`	`PEEKED_END_OBJECT`
`private static int`	`PEEKED_EOF`
`private static int`	`PEEKED_FALSE`
`private static int`	`PEEKED_LONG`	When this is returned, the integer value is stored in peekedLong.
`private static int`	`PEEKED_NONE`
`private static int`	`PEEKED_NULL`
`private static int`	`PEEKED_NUMBER`
`private static int`	`PEEKED_SINGLE_QUOTED`
`private static int`	`PEEKED_SINGLE_QUOTED_NAME`
`private static int`	`PEEKED_TRUE`
`private static int`	`PEEKED_UNQUOTED`
`private static int`	`PEEKED_UNQUOTED_NAME`
`private long`	`peekedLong`	A peeked value that was composed entirely of digits with an optional leading dash.
`private int`	`peekedNumberLength`	The number of characters in a peeked number literal.
`private java.lang.String`	`peekedString`	A peeked string that should be parsed on the next double, long or string.
`private int`	`pos`
`private int[]`	`stack`	The nesting stack.
`private int`	`stackSize`
`private Strictness`	`strictness`

Constructor Summary

Constructors
Constructor Description

JsonReader(java.io.Reader in)
Creates a new instance that reads a JSON-encoded stream from in.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`beginArray()`	Consumes the next token from the JSON stream and asserts that it is the beginning of a new array.
`void`	`beginObject()`	Consumes the next token from the JSON stream and asserts that it is the beginning of a new object.
`private void`	`checkLenient()`
`void`	`close()`	Closes this JSON reader and the underlying `Reader`.
`private void`	`consumeNonExecutePrefix()`	Consumes the non-execute prefix if it exists.
`(package private) int`	`doPeek()`
`void`	`endArray()`	Consumes the next token from the JSON stream and asserts that it is the end of the current array.
`void`	`endObject()`	Consumes the next token from the JSON stream and asserts that it is the end of the current object.
`private boolean`	`fillBuffer(int minimum)`	Returns true once `limit - pos >= minimum`.
`int`	`getNestingLimit()`	Returns the nesting limit of this reader.
`java.lang.String`	`getPath()`	Returns a JSONPath in dot-notation to the next (or current) location in the JSON document.
`private java.lang.String`	`getPath(boolean usePreviousPath)`
`java.lang.String`	`getPreviousPath()`	Returns a JSONPath in dot-notation to the previous (or current) location in the JSON document.
`Strictness`	`getStrictness()`	Returns the strictness of this reader.
`boolean`	`hasNext()`	Returns true if the current array or object has another element.
`boolean`	`isLenient()`	Returns true if the `Strictness` of this reader is equal to `Strictness.LENIENT`.
`private boolean`	`isLiteral(char c)`
`(package private) java.lang.String`	`locationString()`
`boolean`	`nextBoolean()`	Returns the `boolean` value of the next token, consuming it.
`double`	`nextDouble()`	Returns the `double` value of the next token, consuming it.
`int`	`nextInt()`	Returns the `int` value of the next token, consuming it.
`long`	`nextLong()`	Returns the `long` value of the next token, consuming it.
`java.lang.String`	`nextName()`	Returns the next token, a `property name`, and consumes it.
`private int`	`nextNonWhitespace(boolean throwOnEof)`	Returns the next character in the stream that is neither whitespace nor a part of a comment.
`void`	`nextNull()`	Consumes the next token from the JSON stream and asserts that it is a literal null.
`private java.lang.String`	`nextQuotedValue(char quote)`	Returns the string up to but not including `quote`, unescaping any character escape sequences encountered along the way.
`java.lang.String`	`nextString()`	Returns the `string` value of the next token, consuming it.
`private java.lang.String`	`nextUnquotedValue()`	Returns an unquoted value as a string.
`JsonToken`	`peek()`	Returns the type of the next token without consuming it.
`private int`	`peekKeyword()`
`private int`	`peekNumber()`
`private void`	`push(int newTop)`
`private char`	`readEscapeCharacter()`	Unescapes the character identified by the character or characters that immediately follow a backslash.
`void`	`setLenient(boolean lenient)`	Deprecated. Please use `setStrictness(Strictness)` instead.
`void`	`setNestingLimit(int limit)`	Sets the nesting limit of this reader.
`void`	`setStrictness(Strictness strictness)`	Configures how liberal this parser is in what it accepts.
`private void`	`skipQuotedValue(char quote)`
`private boolean`	`skipTo(java.lang.String toFind)`
`private void`	`skipToEndOfLine()`	Advances the position until after the next newline character.
`private void`	`skipUnquotedValue()`
`void`	`skipValue()`	Skips the next value recursively.
`private MalformedJsonException`	`syntaxError(java.lang.String message)`	Throws a new `MalformedJsonException` with the given message and information about the current location.
`java.lang.String`	`toString()`
`private java.lang.IllegalStateException`	`unexpectedTokenError(java.lang.String expected)`

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

- Field Detail
  - MIN_INCOMPLETE_INTEGER
```
private static final long MIN_INCOMPLETE_INTEGER
```
    See Also:
    
    Constant Field Values
  - PEEKED_NONE
```
private static final int PEEKED_NONE
```
    See Also:
    
    Constant Field Values
  - PEEKED_BEGIN_OBJECT
```
private static final int PEEKED_BEGIN_OBJECT
```
    See Also:
    
    Constant Field Values
  - PEEKED_END_OBJECT
```
private static final int PEEKED_END_OBJECT
```
    See Also:
    
    Constant Field Values
  - PEEKED_BEGIN_ARRAY
```
private static final int PEEKED_BEGIN_ARRAY
```
    See Also:
    
    Constant Field Values
  - PEEKED_END_ARRAY
```
private static final int PEEKED_END_ARRAY
```
    See Also:
    
    Constant Field Values
  - PEEKED_TRUE
```
private static final int PEEKED_TRUE
```
    See Also:
    
    Constant Field Values
  - PEEKED_FALSE
```
private static final int PEEKED_FALSE
```
    See Also:
    
    Constant Field Values
  - PEEKED_NULL
```
private static final int PEEKED_NULL
```
    See Also:
    
    Constant Field Values
  - PEEKED_SINGLE_QUOTED
```
private static final int PEEKED_SINGLE_QUOTED
```
    See Also:
    
    Constant Field Values
  - PEEKED_DOUBLE_QUOTED
```
private static final int PEEKED_DOUBLE_QUOTED
```
    See Also:
    
    Constant Field Values
  - PEEKED_UNQUOTED
```
private static final int PEEKED_UNQUOTED
```
    See Also:
    
    Constant Field Values
  - PEEKED_BUFFERED
```
private static final int PEEKED_BUFFERED
```
    When this is returned, the string value is stored in peekedString.
    
    See Also:
    
    Constant Field Values
  - PEEKED_SINGLE_QUOTED_NAME
```
private static final int PEEKED_SINGLE_QUOTED_NAME
```
    See Also:
    
    Constant Field Values
  - PEEKED_DOUBLE_QUOTED_NAME
```
private static final int PEEKED_DOUBLE_QUOTED_NAME
```
    See Also:
    
    Constant Field Values
  - PEEKED_UNQUOTED_NAME
```
private static final int PEEKED_UNQUOTED_NAME
```
    See Also:
    
    Constant Field Values
  - PEEKED_LONG
```
private static final int PEEKED_LONG
```
    When this is returned, the integer value is stored in peekedLong.
    
    See Also:
    
    Constant Field Values
  - PEEKED_NUMBER
```
private static final int PEEKED_NUMBER
```
    See Also:
    
    Constant Field Values
  - PEEKED_EOF
```
private static final int PEEKED_EOF
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_NONE
```
private static final int NUMBER_CHAR_NONE
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_SIGN
```
private static final int NUMBER_CHAR_SIGN
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_DIGIT
```
private static final int NUMBER_CHAR_DIGIT
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_DECIMAL
```
private static final int NUMBER_CHAR_DECIMAL
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_FRACTION_DIGIT
```
private static final int NUMBER_CHAR_FRACTION_DIGIT
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_EXP_E
```
private static final int NUMBER_CHAR_EXP_E
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_EXP_SIGN
```
private static final int NUMBER_CHAR_EXP_SIGN
```
    See Also:
    
    Constant Field Values
  - NUMBER_CHAR_EXP_DIGIT
```
private static final int NUMBER_CHAR_EXP_DIGIT
```
    See Also:
    
    Constant Field Values
  - in
```
private final java.io.Reader in
```
    The input JSON.
  - strictness
```
private Strictness strictness
```
  - DEFAULT_NESTING_LIMIT
```
static final int DEFAULT_NESTING_LIMIT
```
    See Also:
    
    Constant Field Values
  - nestingLimit
```
private int nestingLimit
```
  - BUFFER_SIZE
```
static final int BUFFER_SIZE
```
    See Also:
    
    Constant Field Values
  - buffer
```
private final char[] buffer
```
    Use a manual buffer to easily read and unread upcoming characters, and also so we can create strings without an intermediate StringBuilder. We decode literals directly out of this buffer, so it must be at least as long as the longest token that can be reported as a number.
  - pos
```
private int pos
```
  - limit
```
private int limit
```
  - lineNumber
```
private int lineNumber
```
  - lineStart
```
private int lineStart
```
  - peeked
```
int peeked
```
  - peekedLong
```
private long peekedLong
```
    A peeked value that was composed entirely of digits with an optional leading dash. Positive values may not have a leading 0.
  - peekedNumberLength
```
private int peekedNumberLength
```
    The number of characters in a peeked number literal. Increment 'pos' by this after reading a number.
  - peekedString
```
private java.lang.String peekedString
```
    A peeked string that should be parsed on the next double, long or string. This is populated before a numeric value is parsed and used if that parsing fails.
  - stack
```
private int[] stack
```
    The nesting stack. Using a manual array rather than an ArrayList saves 20%.
  - stackSize
```
private int stackSize
```
  - pathNames
```
private java.lang.String[] pathNames
```
  - pathIndices
```
private int[] pathIndices
```
- Constructor Detail
  - JsonReader
```
public JsonReader(java.io.Reader in)
```
    Creates a new instance that reads a JSON-encoded stream from in.
- Method Detail
  - setLenient
```
@Deprecated
public final void setLenient(boolean lenient)
```
    Deprecated.
    Please use setStrictness(Strictness) instead. JsonReader.setLenient(true) should be replaced by JsonReader.setStrictness(Strictness.LENIENT) and JsonReader.setLenient(false) should be replaced by JsonReader.setStrictness(Strictness.LEGACY_STRICT).
    However, if you used setLenient(false) before, you might prefer Strictness.STRICT now instead.
    
    Sets the strictness of this reader.
    
    Parameters:
    
    lenient - whether this reader should be lenient. If true, the strictness is set to Strictness.LENIENT. If false, the strictness is set to Strictness.LEGACY_STRICT.
    
    See Also:
    
    setStrictness(Strictness)
  - isLenient
```
public final boolean isLenient()
```
    Returns true if the Strictness of this reader is equal to Strictness.LENIENT.
    
    See Also:
    
    getStrictness()
  - setStrictness
```
public final void setStrictness(Strictness strictness)
```
    Configures how liberal this parser is in what it accepts.
    In strict mode, the parser only accepts JSON in accordance with RFC 8259. In legacy strict mode (the default), only JSON in accordance with the RFC 8259 is accepted, with a few exceptions denoted below for backwards compatibility reasons. In lenient mode, all sort of non-spec compliant JSON is accepted (see below).
    
    Strictness.STRICT
    In strict mode, only input compliant with RFC 8259 is accepted.
    Strictness.LEGACY_STRICT
    In legacy strict mode, the following departures from RFC 8259 are accepted:
    
    JsonReader allows the literals true, false and null to have any capitalization, for example fAlSe or NULL
    JsonReader supports the escape sequence \', representing a ' (single-quote)
    JsonReader supports the escape sequence \LF (with LF being the Unicode character U+000A), resulting in a LF within the read JSON string
    JsonReader allows unescaped control characters (U+0000 through U+001F)
    
    Strictness.LENIENT
    In lenient mode, all input that is accepted in legacy strict mode is accepted in addition to the following departures from RFC 8259:
    
    Streams that start with the non-execute prefix, ")]'\n"}
    Streams that include multiple top-level values. With legacy strict or strict parsing, each stream must contain exactly one top-level value.
    Numbers may be NaNs or infinities represented by NaN and (-)Infinity respectively.
    End of line comments starting with // or # and ending with a newline character.
    C-style comments starting with /* and ending with */. Such comments may not be nested.
    Names that are unquoted or 'single quoted'.
    Strings that are unquoted or 'single quoted'.
    Array elements separated by ; instead of ,.
    Unnecessary array separators. These are interpreted as if null was the omitted value.
    Names and values separated by = or => instead of :.
    Name/value pairs separated by ; instead of ,.
    Parameters:
    
    strictness - the new strictness value of this reader. May not be null.
    
    Since:
    
    2.11.0
    
    See Also:
    
    getStrictness()
  - getStrictness
```
public final Strictness getStrictness()
```
    Returns the strictness of this reader.
    
    Since:
    
    2.11.0
    
    See Also:
    
    setStrictness(Strictness)
  - setNestingLimit
```
public final void setNestingLimit(int limit)
```
    Sets the nesting limit of this reader.
    The nesting limit defines how many JSON arrays or objects may be open at the same time. For example a nesting limit of 0 means no arrays or objects may be opened at all, a nesting limit of 1 means one array or object may be open at the same time, and so on. So a nesting limit of 3 allows reading the JSON data [{"a":[true]}], but for a nesting limit of 2 it would fail at the inner [true].
    The nesting limit can help to protect against a StackOverflowError when recursive TypeAdapter implementations process deeply nested JSON data.
    The default nesting limit is 255.
    
    Throws:
    
    java.lang.IllegalArgumentException - if the nesting limit is negative.
    
    Since:
    
    2.12.0
    
    See Also:
    
    getNestingLimit()
  - getNestingLimit
```
public final int getNestingLimit()
```
    Returns the nesting limit of this reader.
    
    Since:
    
    2.12.0
    
    See Also:
    
    setNestingLimit(int)
  - beginArray
```
public void beginArray()
                throws java.io.IOException
```
    Consumes the next token from the JSON stream and asserts that it is the beginning of a new array.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not the beginning of an array.
    
    java.io.IOException
  - endArray
```
public void endArray()
              throws java.io.IOException
```
    Consumes the next token from the JSON stream and asserts that it is the end of the current array.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not the end of an array.
    
    java.io.IOException
  - beginObject
```
public void beginObject()
                 throws java.io.IOException
```
    Consumes the next token from the JSON stream and asserts that it is the beginning of a new object.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not the beginning of an object.
    
    java.io.IOException
  - endObject
```
public void endObject()
               throws java.io.IOException
```
    Consumes the next token from the JSON stream and asserts that it is the end of the current object.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not the end of an object.
    
    java.io.IOException
  - hasNext
```
public boolean hasNext()
                throws java.io.IOException
```
    Returns true if the current array or object has another element.
    
    Throws:
    
    java.io.IOException
  - peek
```
public JsonToken peek()
               throws java.io.IOException
```
    Returns the type of the next token without consuming it.
    
    Throws:
    
    java.io.IOException
  - doPeek
```
int doPeek()
    throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - peekKeyword
```
private int peekKeyword()
                 throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - peekNumber
```
private int peekNumber()
                throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - isLiteral
```
private boolean isLiteral(char c)
                   throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - nextName
```
public java.lang.String nextName()
                          throws java.io.IOException
```
    Returns the next token, a property name, and consumes it.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not a property name.
    
    java.io.IOException
  - nextString
```
public java.lang.String nextString()
                            throws java.io.IOException
```
    Returns the string value of the next token, consuming it. If the next token is a number, this method will return its string form.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not a string.
    
    java.io.IOException
  - nextBoolean
```
public boolean nextBoolean()
                    throws java.io.IOException
```
    Returns the boolean value of the next token, consuming it.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not a boolean.
    
    java.io.IOException
  - nextNull
```
public void nextNull()
              throws java.io.IOException
```
    Consumes the next token from the JSON stream and asserts that it is a literal null.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is not a JSON null.
    
    java.io.IOException
  - nextDouble
```
public double nextDouble()
                  throws java.io.IOException
```
    Returns the double value of the next token, consuming it. If the next token is a string, this method will attempt to parse it as a double using Double.parseDouble(String).
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is neither a number nor a string.
    
    java.lang.NumberFormatException - if the next literal value cannot be parsed as a double.
    
    MalformedJsonException - if the next literal value is NaN or Infinity and this reader is not lenient.
    
    java.io.IOException
  - nextLong
```
public long nextLong()
              throws java.io.IOException
```
    Returns the long value of the next token, consuming it. If the next token is a string, this method will attempt to parse it as a long. If the next token's numeric value cannot be exactly represented by a Java long, this method throws.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is neither a number nor a string.
    
    java.lang.NumberFormatException - if the next literal value cannot be parsed as a number, or exactly represented as a long.
    
    java.io.IOException
  - nextQuotedValue
```
private java.lang.String nextQuotedValue(char quote)
                                  throws java.io.IOException
```
    Returns the string up to but not including quote, unescaping any character escape sequences encountered along the way. The opening quote should have already been read. This consumes the closing quote, but does not include it in the returned string.
    
    Parameters:
    
    quote - either ' or ".
    
    Throws:
    
    java.io.IOException
  - nextUnquotedValue
```
private java.lang.String nextUnquotedValue()
                                    throws java.io.IOException
```
    Returns an unquoted value as a string.
    
    Throws:
    
    java.io.IOException
  - skipQuotedValue
```
private void skipQuotedValue(char quote)
                      throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - skipUnquotedValue
```
private void skipUnquotedValue()
                        throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - nextInt
```
public int nextInt()
            throws java.io.IOException
```
    Returns the int value of the next token, consuming it. If the next token is a string, this method will attempt to parse it as an int. If the next token's numeric value cannot be exactly represented by a Java int, this method throws.
    
    Throws:
    
    java.lang.IllegalStateException - if the next token is neither a number nor a string.
    
    java.lang.NumberFormatException - if the next literal value cannot be parsed as a number, or exactly represented as an int.
    
    java.io.IOException
  - close
```
public void close()
           throws java.io.IOException
```
    Closes this JSON reader and the underlying Reader.
    Using the JSON reader after it has been closed will throw an IllegalStateException in most cases.
    
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in interface java.io.Closeable
    
    Throws:
    
    java.io.IOException
  - skipValue
```
public void skipValue()
               throws java.io.IOException
```
    Skips the next value recursively. This method is intended for use when the JSON token stream contains unrecognized or unhandled values.
    The behavior depends on the type of the next JSON token:
    
    Start of a JSON array or object: It and all of its nested values are skipped.
    Primitive value (for example a JSON number): The primitive value is skipped.
    Property name: Only the name but not the value of the property is skipped. skipValue() has to be called again to skip the property value as well.
    End of a JSON array or object: Only this end token is skipped.
    End of JSON document: Skipping has no effect, the next token continues to be the end of the document.
    Throws:
    
    java.io.IOException
  - push
```
private void push(int newTop)
           throws MalformedJsonException
```
    Throws:
    
    MalformedJsonException
  - fillBuffer
```
private boolean fillBuffer(int minimum)
                    throws java.io.IOException
```
    Returns true once limit - pos >= minimum. If the data is exhausted before that many characters are available, this returns false.
    
    Throws:
    
    java.io.IOException
  - nextNonWhitespace
```
private int nextNonWhitespace(boolean throwOnEof)
                       throws java.io.IOException
```
    Returns the next character in the stream that is neither whitespace nor a part of a comment. When this returns, the returned character is always at buffer[pos-1]; this means the caller can always push back the returned character by decrementing pos.
    
    Throws:
    
    java.io.IOException
  - checkLenient
```
private void checkLenient()
                   throws MalformedJsonException
```
    Throws:
    
    MalformedJsonException
  - skipToEndOfLine
```
private void skipToEndOfLine()
                      throws java.io.IOException
```
    Advances the position until after the next newline character. If the line is terminated by "\r\n", the '\n' must be consumed as whitespace by the caller.
    
    Throws:
    
    java.io.IOException
  - skipTo
```
private boolean skipTo(java.lang.String toFind)
                throws java.io.IOException
```
    Parameters:
    
    toFind - a string to search for. Must not contain a newline.
    
    Throws:
    
    java.io.IOException
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - locationString
```
java.lang.String locationString()
```
  - getPath
```
private java.lang.String getPath(boolean usePreviousPath)
```
  - getPath
```
public java.lang.String getPath()
```
    Returns a JSONPath in dot-notation to the next (or current) location in the JSON document. That means:
    
    For JSON arrays the path points to the index of the next element (even if there are no further elements).
    For JSON objects the path points to the last property, or to the current property if its name has already been consumed.
    
    This method can be useful to add additional context to exception messages before a value is consumed, for example when the peeked token is unexpected.
  - getPreviousPath
```
public java.lang.String getPreviousPath()
```
    Returns a JSONPath in dot-notation to the previous (or current) location in the JSON document. That means:
    
    For JSON arrays the path points to the index of the previous element.
    If no element has been consumed yet it uses the index 0 (even if there are no elements).
    For JSON objects the path points to the last property, or to the current property if its name has already been consumed.
    
    This method can be useful to add additional context to exception messages after a value has been consumed.
  - readEscapeCharacter
```
private char readEscapeCharacter()
                          throws java.io.IOException
```
    Unescapes the character identified by the character or characters that immediately follow a backslash. The backslash '\' should have already been read. This supports both Unicode escapes "u000A" and two-character escapes "\n".
    
    Throws:
    
    MalformedJsonException - if the escape sequence is malformed
    
    java.io.IOException
  - syntaxError
```
private MalformedJsonException syntaxError(java.lang.String message)
                                    throws MalformedJsonException
```
    Throws a new MalformedJsonException with the given message and information about the current location.
    
    Throws:
    
    MalformedJsonException
  - unexpectedTokenError
```
private java.lang.IllegalStateException unexpectedTokenError(java.lang.String expected)
                                                      throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - consumeNonExecutePrefix
```
private void consumeNonExecutePrefix()
                              throws java.io.IOException
```
    Consumes the non-execute prefix if it exists.
    
    Throws:
    
    java.io.IOException

Class JsonReader

Parsing JSON

Configuration

Example

Number Handling

Non-Execute Prefix

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MIN_INCOMPLETE_INTEGER

PEEKED_NONE

PEEKED_BEGIN_OBJECT

PEEKED_END_OBJECT

PEEKED_BEGIN_ARRAY

PEEKED_END_ARRAY

PEEKED_TRUE

PEEKED_FALSE

PEEKED_NULL

PEEKED_SINGLE_QUOTED

PEEKED_DOUBLE_QUOTED

PEEKED_UNQUOTED

PEEKED_BUFFERED

PEEKED_SINGLE_QUOTED_NAME

PEEKED_DOUBLE_QUOTED_NAME

PEEKED_UNQUOTED_NAME

PEEKED_LONG

PEEKED_NUMBER

PEEKED_EOF

NUMBER_CHAR_NONE

NUMBER_CHAR_SIGN

NUMBER_CHAR_DIGIT

NUMBER_CHAR_DECIMAL

NUMBER_CHAR_FRACTION_DIGIT

NUMBER_CHAR_EXP_E

NUMBER_CHAR_EXP_SIGN

NUMBER_CHAR_EXP_DIGIT

in

strictness

DEFAULT_NESTING_LIMIT

nestingLimit

BUFFER_SIZE

buffer

pos

limit

lineNumber

lineStart

peeked

peekedLong

peekedNumberLength

peekedString

stack

stackSize

pathNames

pathIndices

Constructor Detail

JsonReader

Method Detail

setLenient

isLenient

setStrictness

getStrictness

setNestingLimit

getNestingLimit

beginArray

endArray

beginObject

endObject

hasNext

peek

doPeek

peekKeyword

peekNumber

isLiteral

nextName

nextString

nextBoolean

nextNull

nextDouble