If horizon is negative, then an IllegalArgumentException is thrown. Parameters: pattern - the pattern to scan for horizon - the search horizon Returns: the text that matched the specified pattern Throws: IllegalStateException - if this scanner is closed IllegalArgumentException - if horizon is negative skip public Scanner skip Pattern pattern Skips input that matches the specified pattern, ignoring delimiters. This method will skip input if an anchored match of the specified pattern succeeds.
If a match to the specified pattern is not found at the current position, then no input is skipped and a NoSuchElementException is thrown. Since this method seeks to match the specified pattern starting at the scanner's current position, patterns that can match a lot of input ". Note that it is possible to skip something without risking a NoSuchElementException by using a pattern that can match nothing, e. Parameters: pattern - a string specifying the pattern to skip over Returns: this scanner Throws: NoSuchElementException - if the specified pattern is not found IllegalStateException - if this scanner is closed skip public Scanner skip String pattern Skips input that matches a pattern constructed from the specified string.
An invocation of this method of the form skip pattern behaves in exactly the same way as the invocation skip Pattern. Parameters: pattern - a string specifying the pattern to skip over Returns: this scanner Throws: IllegalStateException - if this scanner is closed hasNextBoolean public boolean hasNextBoolean Returns true if the next token in this scanner's input can be interpreted as a boolean value using a case insensitive pattern created from the string "true false".
The scanner does not advance past the input that matched. Returns: true if and only if this scanner's next token is a valid boolean value Throws: IllegalStateException - if this scanner is closed nextBoolean public boolean nextBoolean Scans the next token of the input into a boolean value and returns that value. This method will throw InputMismatchException if the next token cannot be translated into a valid boolean value.
If the match is successful, the scanner advances past the input that matched. Returns: the boolean scanned from the input Throws: InputMismatchException - if the next token is not a valid boolean NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextByte public boolean hasNextByte Returns true if the next token in this scanner's input can be interpreted as a byte value in the default radix using the nextByte method.
Returns: true if and only if this scanner's next token is a valid byte value Throws: IllegalStateException - if this scanner is closed hasNextByte public boolean hasNextByte int radix Returns true if the next token in this scanner's input can be interpreted as a byte value in the specified radix using the nextByte method. Parameters: radix - the radix used to interpret the token as a byte value Returns: true if and only if this scanner's next token is a valid byte value Throws: IllegalStateException - if this scanner is closed nextByte public byte nextByte Scans the next token of the input as a byte.
An invocation of this method of the form nextByte behaves in exactly the same way as the invocation nextByte radix , where radix is the default radix of this scanner. Returns: the byte scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed nextByte public byte nextByte int radix Scans the next token of the input as a byte.
This method will throw InputMismatchException if the next token cannot be translated into a valid byte value as described below. If the translation is successful, the scanner advances past the input that matched. If the next token matches the Integer regular expression defined above then the token is converted into a byte value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
Parameters: radix - the radix used to interpret the token as a byte value Returns: the byte scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextShort public boolean hasNextShort Returns true if the next token in this scanner's input can be interpreted as a short value in the default radix using the nextShort method.
Returns: true if and only if this scanner's next token is a valid short value in the default radix Throws: IllegalStateException - if this scanner is closed hasNextShort public boolean hasNextShort int radix Returns true if the next token in this scanner's input can be interpreted as a short value in the specified radix using the nextShort method.
Parameters: radix - the radix used to interpret the token as a short value Returns: true if and only if this scanner's next token is a valid short value in the specified radix Throws: IllegalStateException - if this scanner is closed nextShort public short nextShort Scans the next token of the input as a short. An invocation of this method of the form nextShort behaves in exactly the same way as the invocation nextShort radix , where radix is the default radix of this scanner.
Returns: the short scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed nextShort public short nextShort int radix Scans the next token of the input as a short.
This method will throw InputMismatchException if the next token cannot be translated into a valid short value as described below. If the next token matches the Integer regular expression defined above then the token is converted into a short value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
Parameters: radix - the radix used to interpret the token as a short value Returns: the short scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextInt public boolean hasNextInt Returns true if the next token in this scanner's input can be interpreted as an int value in the default radix using the nextInt method.
Returns: true if and only if this scanner's next token is a valid int value Throws: IllegalStateException - if this scanner is closed hasNextInt public boolean hasNextInt int radix Returns true if the next token in this scanner's input can be interpreted as an int value in the specified radix using the nextInt method.
Parameters: radix - the radix used to interpret the token as an int value Returns: true if and only if this scanner's next token is a valid int value Throws: IllegalStateException - if this scanner is closed nextInt public int nextInt Scans the next token of the input as an int. An invocation of this method of the form nextInt behaves in exactly the same way as the invocation nextInt radix , where radix is the default radix of this scanner. Returns: the int scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed nextInt public int nextInt int radix Scans the next token of the input as an int.
This method will throw InputMismatchException if the next token cannot be translated into a valid int value as described below. If the next token matches the Integer regular expression defined above then the token is converted into an int value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
Parameters: radix - the radix used to interpret the token as an int value Returns: the int scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextLong public boolean hasNextLong Returns true if the next token in this scanner's input can be interpreted as a long value in the default radix using the nextLong method.
Returns: true if and only if this scanner's next token is a valid long value Throws: IllegalStateException - if this scanner is closed hasNextLong public boolean hasNextLong int radix Returns true if the next token in this scanner's input can be interpreted as a long value in the specified radix using the nextLong method. Parameters: radix - the radix used to interpret the token as a long value Returns: true if and only if this scanner's next token is a valid long value Throws: IllegalStateException - if this scanner is closed nextLong public long nextLong Scans the next token of the input as a long.
An invocation of this method of the form nextLong behaves in exactly the same way as the invocation nextLong radix , where radix is the default radix of this scanner. Returns: the long scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed nextLong public long nextLong int radix Scans the next token of the input as a long.
This method will throw InputMismatchException if the next token cannot be translated into a valid long value as described below. If the next token matches the Integer regular expression defined above then the token is converted into a long value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
Parameters: radix - the radix used to interpret the token as an int value Returns: the long scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextFloat public boolean hasNextFloat Returns true if the next token in this scanner's input can be interpreted as a float value using the nextFloat method.
Returns: true if and only if this scanner's next token is a valid float value Throws: IllegalStateException - if this scanner is closed nextFloat public float nextFloat Scans the next token of the input as a float. This method will throw InputMismatchException if the next token cannot be translated into a valid float value as described below. If the next token matches the Float regular expression defined above then the token is converted into a float value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
If the token matches the localized NaN or infinity strings, then either "Nan" or "Infinity" is passed to Float. Returns: the float scanned from the input Throws: InputMismatchException - if the next token does not match the Float regular expression, or is out of range NoSuchElementException - if input is exhausted IllegalStateException - if this scanner is closed hasNextDouble public boolean hasNextDouble Returns true if the next token in this scanner's input can be interpreted as a double value using the nextDouble method.
Returns: true if and only if this scanner's next token is a valid double value Throws: IllegalStateException - if this scanner is closed nextDouble public double nextDouble Scans the next token of the input as a double. This method will throw InputMismatchException if the next token cannot be translated into a valid double value. If the next token matches the Float regular expression defined above then the token is converted into a double value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via Character.
If the token matches the localized NaN or infinity strings, then either "Nan" or "Infinity" is passed to Double. Returns: the double scanned from the input Throws: InputMismatchException - if the next token does not match the Float regular expression, or is out of range NoSuchElementException - if the input is exhausted IllegalStateException - if this scanner is closed hasNextBigInteger public boolean hasNextBigInteger Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the default radix using the nextBigInteger method.
Returns: true if and only if this scanner's next token is a valid BigInteger Throws: IllegalStateException - if this scanner is closed hasNextBigInteger public boolean hasNextBigInteger int radix Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the specified radix using the nextBigInteger method.
Parameters: radix - the radix used to interpret the token as an integer Returns: true if and only if this scanner's next token is a valid BigInteger Throws: IllegalStateException - if this scanner is closed nextBigInteger public BigInteger nextBigInteger Scans the next token of the input as a BigInteger.
An invocation of this method of the form nextBigInteger behaves in exactly the same way as the invocation nextBigInteger radix , where radix is the default radix of this scanner. Parameters: radix - the radix used to interpret the token Returns: the BigInteger scanned from the input Throws: InputMismatchException - if the next token does not match the Integer regular expression, or is out of range NoSuchElementException - if the input is exhausted IllegalStateException - if this scanner is closed hasNextBigDecimal public boolean hasNextBigDecimal Returns true if the next token in this scanner's input can be interpreted as a BigDecimal using the nextBigDecimal method.
Returns: the BigDecimal scanned from the input Throws: InputMismatchException - if the next token does not match the Decimal regular expression, or is out of range NoSuchElementException - if the input is exhausted IllegalStateException - if this scanner is closed reset public Scanner reset Resets this scanner.
Resetting a scanner discards all of its explicit state information which may have been changed by invocations of useDelimiter java. Pattern , useLocale java. Locale , or useRadix int. An invocation of this method of the form scanner. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. All rights reserved. Use is subject to license terms.
Also see the documentation redistribution policy. Skip navigation links. Object java. Constructor Summary Constructors Constructor and Description Scanner File source Constructs a new Scanner that produces values scanned from the specified file.
Constructs a new Scanner that produces values scanned from the specified file. Constructs a new Scanner that produces values scanned from the specified input stream. Constructs a new Scanner that produces values scanned from the specified source. Constructs a new Scanner that produces values scanned from the specified channel.
Constructs a new Scanner that produces values scanned from the specified string. Returns the Pattern this Scanner is currently using to match delimiters. Attempts to find the next occurrence of the specified pattern ignoring delimiters. Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.
Returns true if the next token matches the pattern constructed from the specified string. Returns true if the next token in this scanner's input can be interpreted as a BigDecimal using the nextBigDecimal method. Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the default radix using the nextBigInteger method.
Returns true if the next token in this scanner's input can be interpreted as a BigInteger in the specified radix using the nextBigInteger method. Returns true if the next token in this scanner's input can be interpreted as a boolean value using a case insensitive pattern created from the string "true false".
Returns true if the next token in this scanner's input can be interpreted as a byte value in the default radix using the nextByte method. Returns true if the next token in this scanner's input can be interpreted as a byte value in the specified radix using the nextByte method. Returns true if the next token in this scanner's input can be interpreted as a double value using the nextDouble method. Returns true if the next token in this scanner's input can be interpreted as a float value using the nextFloat method.
Returns true if the next token in this scanner's input can be interpreted as an int value in the default radix using the nextInt method. Returns true if the next token in this scanner's input can be interpreted as an int value in the specified radix using the nextInt method. In the above example, we have used the nextDouble method to read a floating-point value.
In the above example, we have used the next method to read a string from the user. Here, we have provided the full name. However, the next method only reads the first name. This is because the next method reads input up to the whitespace character. Once the whitespace is encountered, it returns the string excluding the whitespace. In the first example, we have used the nextLine method to read a string from the user.
Unlike next , the nextLine method reads the entire line of input including spaces. Recommended Reading: Java Scanner skipping the nextLine. In the above example, we have used the java. BigInteger and java. The Scanner class reads an entire line and divides the line into tokens.
Tokens are small elements that have some meaning to the Java compiler. For example,. In this case, the scanner object will read the entire line and divides the string into tokens: " He ", " is " and " 22 ".
The object then iterates over each token and reads each token using its different methods. Course Index Explore Programiz. Java for Loop. Arrays in Java. Interfaces in Java. Scanner class is one of them. The Java Scanner class breaks the input into tokens using a delimiter which is whitespace by default. It provides many methods to read and parse various primitive values. The Java Scanner class is widely used to parse text for strings and primitive types using a regular expression.
It is the simplest way to get input in Java. By the help of Scanner in Java, we can get input from the user in primitive types such as int, long, double, byte, float, short, etc.
To get a single character from the scanner, you can call next. To get the instance of Java Scanner which reads input from the user, we need to pass the input stream System.
For Example:. To get the instance of Java Scanner which parses the strings, we need to pass the strings in the constructor of Scanner class. Let's see a simple example of Java Scanner where we are getting a single input from the user. Here, we are asking for a string through in. JavaTpoint offers too many high quality services.
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