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Summary: Ctors | Methods | Inherited Methods | [Expand All]

Added in API level 1

public final class

Scanner

extends Object
implements Iterator<E>

java.lang.Object
↳	java.util.Scanner

Class Overview

A parser that parses a text string of primitive types and strings with the help of regular expressions. It supports localized numbers and various radixes. The input is broken into tokens by the delimiter pattern, which is whitespace by default. The primitive types can be obtained via corresponding next* methods. If the token is not in a valid format, an InputMismatchException is thrown.

For example:

 Scanner s = new Scanner("1A true");
 System.out.println(s.nextInt(16));
 System.out.println(s.nextBoolean());

Yields the result: 26 true

A Scanner can also find or skip specific patterns without regard for the delimiter. All these methods and the various next* and hasNext* methods may block.

The Scanner class is not thread-safe.

Summary

Public Constructors
	Scanner(File src) Creates a `Scanner` with the specified `File` as input.
	Scanner(File src, String charsetName) Creates a `Scanner` with the specified `File` as input.
	Scanner(String src) Creates a `Scanner` on the specified string.
	Scanner(InputStream src) Creates a `Scanner` on the specified `InputStream`.
	Scanner(InputStream src, String charsetName) Creates a `Scanner` on the specified `InputStream`.
	Scanner(Readable src) Creates a `Scanner` with the specified `Readable` as input.
	Scanner(ReadableByteChannel src) Creates a `Scanner` with the specified `ReadableByteChannel` as input.
	Scanner(ReadableByteChannel src, String charsetName) Creates a `Scanner` with the specified `ReadableByteChannel` as input.

Public Methods
void	close() Closes this `Scanner` and the underlying input if the input implements `Closeable`.
Pattern	delimiter() Returns the delimiter `Pattern` in use by this `Scanner`.
String	findInLine(String pattern) Compiles the pattern string and tries to find a substing matching it in the input data.
String	findInLine(Pattern pattern) Tries to find the pattern in the input.
String	findWithinHorizon(Pattern pattern, int horizon) Tries to find the pattern in the input between the current position and the specified horizon.
String	findWithinHorizon(String pattern, int horizon) Tries to find the pattern in the input between the current position and the specified `horizon`.
boolean	hasNext() Returns whether this `Scanner` has one or more tokens remaining to parse.
boolean	hasNext(String pattern) Returns `true` if this `Scanner` has one or more tokens remaining to parse and the next token matches a pattern compiled from the given string.
boolean	hasNext(Pattern pattern) Returns whether this `Scanner` has one or more tokens remaining to parse and the next token matches the given pattern.
boolean	hasNextBigDecimal() Returns whether the next token can be translated into a valid `BigDecimal`.
boolean	hasNextBigInteger(int radix) Returns whether the next token can be translated into a valid `BigInteger` in the specified radix.
boolean	hasNextBigInteger() Returns whether the next token can be translated into a valid `BigInteger` in the default radix.
boolean	hasNextBoolean() Returns whether the next token can be translated into a valid `boolean` value.
boolean	hasNextByte() Returns whether the next token can be translated into a valid `byte` value in the default radix.
boolean	hasNextByte(int radix) Returns whether the next token can be translated into a valid `byte` value in the specified radix.
boolean	hasNextDouble() Returns whether the next token translated into a valid `double` value.
boolean	hasNextFloat() Returns whether the next token can be translated into a valid `float` value.
boolean	hasNextInt(int radix) Returns whether the next token can be translated into a valid `int` value in the specified radix.
boolean	hasNextInt() Returns whether the next token can be translated into a valid `int` value in the default radix.
boolean	hasNextLine() Returns whether there is a line terminator in the input.
boolean	hasNextLong(int radix) Returns whether the next token can be translated into a valid `long` value in the specified radix.
boolean	hasNextLong() Returns whether the next token can be translated into a valid `long` value in the default radix.
boolean	hasNextShort(int radix) Returns whether the next token can be translated into a valid `short` value in the specified radix.
boolean	hasNextShort() Returns whether the next token can be translated into a valid `short` value in the default radix.
IOException	ioException() Returns the last `IOException` that was raised while reading from the underlying input.
Locale	locale() Return the `Locale` of this `Scanner`.
MatchResult	match() Returns the result of the last matching operation.
String	next() Returns the next token.
String	next(Pattern pattern) Returns the next token if it matches the specified pattern.
String	next(String pattern) Returns the next token if it matches the specified pattern.
BigDecimal	nextBigDecimal() Returns the next token as a `BigDecimal`.
BigInteger	nextBigInteger(int radix) Returns the next token as a `BigInteger` with the specified radix.
BigInteger	nextBigInteger() Returns the next token as a `BigInteger`.
boolean	nextBoolean() Returns the next token as a `boolean`.
byte	nextByte() Returns the next token as a `byte`.
byte	nextByte(int radix) Returns the next token as a `byte` with the specified radix.
double	nextDouble() Returns the next token as a `double`.
float	nextFloat() Returns the next token as a `float`.
int	nextInt(int radix) Returns the next token as an `int` with the specified radix.
int	nextInt() Returns the next token as an `int`.
String	nextLine() Returns the skipped input and advances the `Scanner` to the beginning of the next line.
long	nextLong(int radix) Returns the next token as a `long` with the specified radix.
long	nextLong() Returns the next token as a `long`.
short	nextShort(int radix) Returns the next token as a `short` with the specified radix.
short	nextShort() Returns the next token as a `short`.
int	radix() Return the radix of this `Scanner`.
void	remove() Remove is not a supported operation on `Scanner`.
Scanner	reset() Resets this scanner's delimiter, locale, and radix.
Scanner	skip(String pattern) Tries to use the specified string to construct a pattern and then uses the constructed pattern to match input starting from the current position.
Scanner	skip(Pattern pattern) Tries to use specified pattern to match input starting from the current position.
String	toString() Returns a string representation of this `Scanner`.
Scanner	useDelimiter(String pattern) Sets the delimiting pattern of this `Scanner` with a pattern compiled from the supplied string value.
Scanner	useDelimiter(Pattern pattern) Sets the delimiting pattern of this `Scanner`.
Scanner	useLocale(Locale l) Sets the `Locale` of this `Scanner` to a specified `Locale`.
Scanner	useRadix(int radix) Sets the radix of this `Scanner` to the specified radix.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

From interface java.util.Iterator

Public Constructors

public Scanner (File src)

Added in API level 1

Creates a Scanner with the specified File as input. The default charset is applied when reading the file.

Parameters

src	the file to be scanned.

Throws

FileNotFoundException	if the specified file does not exist.

public Scanner (File src, String charsetName)

Added in API level 1

Creates a Scanner with the specified File as input. The specified charset is applied when reading the file.

Parameters

src	the file to be scanned.
charsetName	the name of the encoding type of the file.

Throws

FileNotFoundException	if the specified file does not exist.
IllegalArgumentException	if the specified coding does not exist.

public Scanner (String src)

Added in API level 1

Creates a Scanner on the specified string.

Parameters

src	the string to be scanned.

public Scanner (InputStream src)

Added in API level 1

Creates a Scanner on the specified InputStream. The default charset is applied when decoding the input.

Parameters

src	the `InputStream` to be scanned.

public Scanner (InputStream src, String charsetName)

Added in API level 1

Creates a Scanner on the specified InputStream. The specified charset is applied when decoding the input.

Parameters

src	the `InputStream` to be scanned.
charsetName	the encoding type of the `InputStream`.

Throws

IllegalArgumentException	if the specified character set is not found.

public Scanner (Readable src)

Added in API level 1

Creates a Scanner with the specified Readable as input.

Parameters

src	the `Readable` to be scanned.

public Scanner (ReadableByteChannel src)

Added in API level 1

Creates a Scanner with the specified ReadableByteChannel as input. The default charset is applied when decoding the input.

Parameters

src	the `ReadableByteChannel` to be scanned.

public Scanner (ReadableByteChannel src, String charsetName)

Added in API level 1

Creates a Scanner with the specified ReadableByteChannel as input. The specified charset is applied when decoding the input.

Parameters

src	the `ReadableByteChannel` to be scanned.
charsetName	the encoding type of the content.

Throws

IllegalArgumentException	if the specified character set is not found.

Public Methods

public void close ()

Added in API level 1

Closes this Scanner and the underlying input if the input implements Closeable. If the Scanner has been closed, this method will have no effect. Any scanning operation called after calling this method will throw an IllegalStateException.

public Pattern delimiter ()

Added in API level 1

Returns the delimiter Pattern in use by this Scanner.

Returns

the delimiter Pattern in use by this Scanner.

public String findInLine (String pattern)

Added in API level 1

Compiles the pattern string and tries to find a substing matching it in the input data. The delimiter will be ignored. This is the same as invoking findInLine(Pattern.compile(pattern)).

Parameters

pattern	a string used to construct a pattern which is in turn used to match a substring of the input data.

Returns

the matched string or null if the pattern is not found before the next line terminator.

Throws

IllegalStateException	if the `Scanner` is closed.

public String findInLine (Pattern pattern)

Added in API level 1

Tries to find the pattern in the input. Delimiters are ignored. If the pattern is found before line terminator, the matched string will be returned, and the Scanner will advance to the end of the matched string. Otherwise, null will be returned and the Scanner will not advance. When waiting for input, the Scanner may be blocked. All the input may be cached if no line terminator exists in the buffer.

Parameters

pattern	the pattern to find in the input.

Returns

the matched string or null if the pattern is not found before the next line terminator.

Throws

IllegalStateException	if the `Scanner` is closed.

public String findWithinHorizon (Pattern pattern, int horizon)

Added in API level 1

Tries to find the pattern in the input between the current position and the specified horizon. Delimiters are ignored. If the pattern is found, the matched string will be returned, and the Scanner will advance to the end of the matched string. Otherwise, null will be returned and Scanner will not advance. When waiting for input, the Scanner may be blocked.

The Scanner's search will never go more than horizon code points from current position. The position of horizon does have an effect on the result of the match. For example, when the input is "123" and current position is at zero, findWithinHorizon(Pattern.compile("\\p{Digit}{3}"), 2) will return null, while findWithinHorizon(Pattern.compile("\\p{Digit}{3}"), 3) will return "123". horizon is treated as a transparent, non-anchoring bound. (refer to useTransparentBounds(boolean) and useAnchoringBounds(boolean))

A horizon whose value is zero will be ignored and the whole input will be used for search. In this situation, all the input may be cached.

Parameters

pattern	the pattern used to scan.
horizon	the search limit.

Returns

the matched string or null if the pattern is not found within the specified horizon.

Throws

IllegalStateException	if the `Scanner` is closed.
IllegalArgumentException	if `horizon` is less than zero.

public String findWithinHorizon (String pattern, int horizon)

Added in API level 1

Tries to find the pattern in the input between the current position and the specified horizon. Delimiters are ignored. This call is the same as invoking findWithinHorizon(Pattern.compile(pattern)).

Parameters

pattern	the pattern used to scan.
horizon	the search limit.

Returns

the matched string, or null if the pattern is not found within the specified horizon.

Throws

IllegalStateException	if the `Scanner` is closed.
IllegalArgumentException	if `horizon` is less than zero.

public boolean hasNext ()

Added in API level 1

Returns whether this Scanner has one or more tokens remaining to parse. This method will block if the data is still being read.

Returns

true if this Scanner has one or more tokens remaining, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNext (String pattern)

Added in API level 1

Returns true if this Scanner has one or more tokens remaining to parse and the next token matches a pattern compiled from the given string. This method will block if the data is still being read. This call is equivalent to hasNext(Pattern.compile(pattern)).

Parameters

pattern	the string specifying the pattern to scan for

Returns

true if the specified pattern matches this Scanner's next token, false otherwise.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNext (Pattern pattern)

Added in API level 1

Returns whether this Scanner has one or more tokens remaining to parse and the next token matches the given pattern. This method will block if the data is still being read.

Parameters

pattern	the pattern to check for.

Returns

true if this Scanner has more tokens and the next token matches the pattern, false otherwise.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextBigDecimal ()

Added in API level 1

Returns whether the next token can be translated into a valid BigDecimal.

Returns

true if the next token can be translated into a valid BigDecimal, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextBigInteger (int radix)

Added in API level 1

Returns whether the next token can be translated into a valid BigInteger in the specified radix.

Parameters

radix	the radix used to translate the token into a `BigInteger`.

Returns

true if the next token can be translated into a valid BigInteger, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextBigInteger ()

Added in API level 1

Returns whether the next token can be translated into a valid BigInteger in the default radix.

Returns

true if the next token can be translated into a valid BigInteger, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextBoolean ()

Added in API level 1

Returns whether the next token can be translated into a valid boolean value.

Returns

true if the next token can be translated into a valid boolean value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextByte ()

Added in API level 1

Returns whether the next token can be translated into a valid byte value in the default radix.

Returns

true if the next token can be translated into a valid byte value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextByte (int radix)

Added in API level 1

Returns whether the next token can be translated into a valid byte value in the specified radix.

Parameters

radix	the radix used to translate the token into a `byte` value

Returns

true if the next token can be translated into a valid byte value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextDouble ()

Added in API level 1

Returns whether the next token translated into a valid double value.

Returns

true if the next token can be translated into a valid double value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextFloat ()

Added in API level 1

Returns whether the next token can be translated into a valid float value.

Returns

true if the next token can be translated into a valid float value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextInt (int radix)

Added in API level 1

Returns whether the next token can be translated into a valid int value in the specified radix.

Parameters

radix	the radix used to translate the token into an `int` value.

Returns

true if the next token in this Scanner's input can be translated into a valid int value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextInt ()

Added in API level 1

Returns whether the next token can be translated into a valid int value in the default radix.

Returns

true if the next token can be translated into a valid int value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed,

public boolean hasNextLine ()

Added in API level 1

Returns whether there is a line terminator in the input. This method may block.

Returns

true if there is a line terminator in the input, otherwise, false.

Throws

IllegalStateException	if the `Scanner` is closed.

public boolean hasNextLong (int radix)

Added in API level 1

Returns whether the next token can be translated into a valid long value in the specified radix.

Parameters

radix	the radix used to translate the token into a `long` value.

Returns

true if the next token can be translated into a valid long value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextLong ()

Added in API level 1

Returns whether the next token can be translated into a valid long value in the default radix.

Returns

true if the next token can be translated into a valid long value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextShort (int radix)

Added in API level 1

Returns whether the next token can be translated into a valid short value in the specified radix.

Parameters

radix	the radix used to translate the token into a `short` value.

Returns

true if the next token can be translated into a valid short value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public boolean hasNextShort ()

Added in API level 1

Returns whether the next token can be translated into a valid short value in the default radix.

Returns

true if the next token can be translated into a valid short value, otherwise false.

Throws

IllegalStateException	if the `Scanner` has been closed.

public IOException ioException ()

Added in API level 1

Returns the last IOException that was raised while reading from the underlying input.

Returns

the last thrown IOException, or null if none was thrown.

public Locale locale ()

Added in API level 1

Return the Locale of this Scanner.

Returns

the Locale of this Scanner.

public MatchResult match ()

Added in API level 1

Returns the result of the last matching operation.

The next* and find* methods return the match result in the case of a successful match.

Returns

the match result of the last successful match operation

Throws

IllegalStateException	if the match result is not available, of if the last match was not successful.

public String next ()

Added in API level 1

Returns the next token. The token will be both prefixed and postfixed by the delimiter that is currently being used (or a string that matches the delimiter pattern). This method will block if input is being read.

Returns

the next complete token.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.

public String next (Pattern pattern)

Added in API level 1

Returns the next token if it matches the specified pattern. The token will be both prefixed and postfixed by the delimiter that is currently being used (or a string that matches the delimiter pattern). This method will block if input is being read.

Parameters

pattern	the specified pattern to scan.

Returns

the next token.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token does not match the pattern given.

public String next (String pattern)

Added in API level 1

Parameters

pattern	the string specifying the pattern to scan for.

Returns

the next token.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token does not match the pattern given.

public BigDecimal nextBigDecimal ()

Added in API level 1

Returns the next token as a BigDecimal. This method will block if input is being read. If the next token can be translated into a BigDecimal the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting string is passed to BigDecimal(String) .

Returns

the next token as a BigDecimal.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `BigDecimal`.

public BigInteger nextBigInteger (int radix)

Added in API level 1

Returns the next token as a BigInteger with the specified radix. This method will block if input is being read. If the next token can be translated into a BigInteger the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to BigInteger(String, int)} with the specified radix.

Parameters

radix	the radix used to translate the token into a `BigInteger`.

Returns

the next token as a BigInteger

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `BigInteger`.

public BigInteger nextBigInteger ()

Added in API level 1

Returns the next token as a BigInteger. This method will block if input is being read. Equivalent to nextBigInteger(DEFAULT_RADIX).

Returns

the next token as BigInteger.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `BigInteger`.

public boolean nextBoolean ()

Added in API level 1

Returns the next token as a boolean. This method will block if input is being read.

Returns

the next token as a boolean.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `boolean` value.

public byte nextByte ()

Added in API level 1

Returns the next token as a byte. This method will block if input is being read. Equivalent to nextByte(DEFAULT_RADIX).

Returns

the next token as a byte.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `byte` value.

public byte nextByte (int radix)

Added in API level 1

Returns the next token as a byte with the specified radix. Will block if input is being read. If the next token can be translated into a byte the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseByte(String, int)} with the specified radix.

Parameters

radix	the radix used to translate the token into `byte` value.

Returns

the next token as a byte.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `byte` value.

public double nextDouble ()

Added in API level 1

Returns the next token as a double. This method will block if input is being read. If the next token can be translated into a double the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseDouble(String)}. If the token matches the localized NaN or infinity strings, it is also passed to parseDouble(String)}.

Returns

the next token as a double.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `double` value.

public float nextFloat ()

Added in API level 1

Returns the next token as a float. This method will block if input is being read. If the next token can be translated into a float the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseFloat(String)}.If the token matches the localized NaN or infinity strings, it is also passed to parseFloat(String)}.

Returns

the next token as a float.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `float` value.

public int nextInt (int radix)

Added in API level 1

Returns the next token as an int with the specified radix. This method will block if input is being read. If the next token can be translated into an int the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseInt(String, int) with the specified radix.

Parameters

radix	the radix used to translate the token into an `int` value.

Returns

the next token as an int.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `int` value.

public int nextInt ()

Added in API level 1

Returns the next token as an int. This method will block if input is being read. Equivalent to nextInt(DEFAULT_RADIX).

Returns

the next token as an int

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `int` value.

public String nextLine ()

Added in API level 1

Returns the skipped input and advances the Scanner to the beginning of the next line. The returned result will exclude any line terminator. When searching, if no line terminator is found, then a large amount of input will be cached. If no line at all can be found, a NoSuchElementException will be thrown.

Returns

the skipped line.

Throws

IllegalStateException	if the `Scanner` is closed.
NoSuchElementException	if no line can be found, e.g. when input is an empty string.

public long nextLong (int radix)

Added in API level 1

Returns the next token as a long with the specified radix. This method will block if input is being read. If the next token can be translated into a long the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseLong(String, int)} with the specified radix.

Parameters

radix	the radix used to translate the token into a `long` value.

Returns

the next token as a long.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `long` value.

public long nextLong ()

Added in API level 1

Returns the next token as a long. This method will block if input is being read. Equivalent to nextLong(DEFAULT_RADIX).

Returns

the next token as a long.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `long` value.

public short nextShort (int radix)

Added in API level 1

Returns the next token as a short with the specified radix. This method will block if input is being read. If the next token can be translated into a short the following is done: All Locale-specific prefixes, group separators, and Locale-specific suffixes are removed. Then non-ASCII digits are mapped into ASCII digits via digit(char, int), and a negative sign (-) is added if the Locale-specific negative prefix or suffix was present. Finally the resulting String is passed to parseShort(String, int)} with the specified radix.

Parameters

radix	the radix used to translate the token into `short` value.

Returns

the next token as a short.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `short` value.

public short nextShort ()

Added in API level 1

Returns the next token as a short. This method will block if input is being read. Equivalent to nextShort(DEFAULT_RADIX).

Returns

the next token as a short.

Throws

IllegalStateException	if this `Scanner` has been closed.
NoSuchElementException	if input has been exhausted.
InputMismatchException	if the next token can not be translated into a valid `short` value.

public int radix ()

Added in API level 1

Return the radix of this Scanner.

Returns

the radix of this Scanner

public void remove ()

Added in API level 1

Remove is not a supported operation on Scanner.

Throws

UnsupportedOperationException	if this method is invoked.

public Scanner reset ()

Added in API level 9

Resets this scanner's delimiter, locale, and radix.

Returns

this scanner

public Scanner skip (String pattern)

Added in API level 1

Tries to use the specified string to construct a pattern and then uses the constructed pattern to match input starting from the current position. The delimiter will be ignored. This call is the same as invoke skip(Pattern.compile(pattern)).

Parameters

pattern	the string used to construct a pattern which in turn is used to match input.

Returns

the Scanner itself.

Throws

IllegalStateException	if the `Scanner` is closed.

public Scanner skip (Pattern pattern)

Added in API level 1

Tries to use specified pattern to match input starting from the current position. The delimiter will be ignored. If a match is found, the matched input will be skipped. If an anchored match of the specified pattern succeeds, the corresponding input will also be skipped. Otherwise, a NoSuchElementException will be thrown. Patterns that can match a lot of input may cause the Scanner to read in a large amount of input.

Parameters

pattern	used to skip over input.

Returns

the Scanner itself.

Throws

IllegalStateException	if the `Scanner` is closed.
NoSuchElementException	if the specified pattern match fails.

public String toString ()

Added in API level 1

Returns a string representation of this Scanner. The information returned may be helpful for debugging. The format of the string is unspecified.

Returns

a string representation of this Scanner.

public Scanner useDelimiter (String pattern)

Added in API level 1

Sets the delimiting pattern of this Scanner with a pattern compiled from the supplied string value.

Parameters

pattern	a string from which a `Pattern` can be compiled.

Returns

this Scanner.

public Scanner useDelimiter (Pattern pattern)

Added in API level 1

Sets the delimiting pattern of this Scanner.

Parameters

pattern	the delimiting pattern to use.

Returns

this Scanner.

public Scanner useLocale (Locale l)

Added in API level 1

Sets the Locale of this Scanner to a specified Locale.

Parameters

l	the specified `Locale` to use.

Returns

this Scanner.

public Scanner useRadix (int radix)

Added in API level 1

Sets the radix of this Scanner to the specified radix.

Parameters

radix	the specified radix to use.

Returns

this Scanner.

Results

Interfaces

Classes

Enums

Exceptions

Errors

Scanner

Class Overview

Summary

Public Constructors

public Scanner (File src)

Parameters

Throws

public Scanner (File src, String charsetName)

Parameters

Throws

public Scanner (String src)

Parameters

public Scanner (InputStream src)

Parameters

public Scanner (InputStream src, String charsetName)

Parameters

Throws

public Scanner (Readable src)

Parameters

public Scanner (ReadableByteChannel src)

Parameters

public Scanner (ReadableByteChannel src, String charsetName)

Parameters

Throws

Public Methods

public void close ()

See Also

public Pattern delimiter ()

Returns

public String findInLine (String pattern)

Parameters

Returns

Throws

See Also

public String findInLine (Pattern pattern)

Parameters

Returns

Throws

public String findWithinHorizon (Pattern pattern, int horizon)

Parameters

Returns

Throws

public String findWithinHorizon (String pattern, int horizon)

Parameters

Returns

Throws

See Also

public boolean hasNext ()

Returns

Throws

public boolean hasNext (String pattern)

Parameters

Returns

Throws

public boolean hasNext (Pattern pattern)

Parameters

Returns

Throws

public boolean hasNextBigDecimal ()

Returns

Throws

public boolean hasNextBigInteger (int radix)

Parameters

Returns

Throws

public boolean hasNextBigInteger ()

Returns

Throws

public boolean hasNextBoolean ()

Returns

Throws

public boolean hasNextByte ()

Returns

Throws