Thanks once again I got it to work yesterday. Though there is one small problem when I read the files and I try to convert the String to booleans and ints etc.. I get just an empty value I am parsing it. Does it mean the scanner is also reading the white space in my textfile?
Any ideas. I get just an empty value. Too much code to just read a file. Also you forgot to post the contents of the file.
Make a small program lines that reads the file and displays its contents. If you can't make a small program, then try debugging your code by adding printlns to every place that the data goes from when it is read in to where it is becoming empty. Print out all the values of all the variables the data is assigned to. If you read the data ok, then somewhere in the process of getting it to the variables it is being lost. Print out the history of where it goes and maybe you'll see where.
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It's also possible that there was a typo when posting the URL. We redirect you to this notice instead of stripping out the link to preserve the integrity of the post. This is a custom class BTW. Answered by NormR1 in a post from 10 Years Ago. To copy the contents of the command prompt window: … Jump to Post. Answered by Taywin in a post from 10 Years Ago. The problem is that if the line you are calling has only 3 characters, the last one will … Jump to Post.
Answered by JamesCherrill 4, in a post from 10 Years Ago. Hi Taywin - I think this must have been a keyboard error I'm sure you know what next does really ;- public String next Finds and returns the next complete token from this scanner. A complete token is preceded and followed by input … Jump to Post. I'm actually suppose to use 4 arrays of Strings, booleans, ints, and doubles Are you sure?
The problem description you gave us says Create a custom class that could be used to describe the animal. Your class should have at least one String, one int, one boolean, and one double … Jump to Post. Each Animal has its own name, weight etc with methods to get those values when you need them Jump to Post. Last Seen 6 Hours Ago. Success name is null By the way the text file says. Are you sure? A null string has no value and makes a string null by assigning a null keyword as a value to it.
Let's take an example of it to understand how we can use it for null checking. Date and DateTime both are the non-primitive data types, so they can store a null value. Let's take an example of a date and time object to understand how we can check a null date or datetime object.
In order to check whether a Java object is Null or not, we can either use the isNull method of the Objects class or comparison operator. Let's take an example to understand how we can use the isNull method or comparison operator for null check of Java object. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week.
Java Training Java Tutorial. Abstract class Interface Abstract vs Interface. Package Access Modifiers Encapsulation. ParseException; importjava. SimpleDateFormat; importjava. Active Oldest Votes. Improve this answer. Ari Ari 1 2 2 bronze badges. I tried this and it didn't change the error. Thanks for trying to help though. For instance, let's say your text file is this: , August, , September, , October, , April The Overflow Blog. Podcast Making Agile work for data science.
Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. CharBuffer method throws an IOException then the scanner assumes that the end of the input has been reached.
The most recent IOException thrown by the underlying readable can be retrieved via the ioException method. When a Scanner is closed, it will close its input source if the source implements the Closeable interface. A Scanner is not safe for multithreaded use without external synchronization. Unless otherwise mentioned, passing a null parameter into any method of a Scanner will cause a NullPointerException to be thrown.
A scanner will default to interpreting numbers as decimal unless a different radix has been set by using the useRadix int method. The reset method will reset the value of the scanner's radix to 10 regardless of whether it was previously changed. Localized numbers An instance of this class is capable of scanning numbers in the standard formats as well as in the formats of the scanner's locale.
A scanner's initial locale is the value returned by the Locale. Locale method. The reset method will reset the value of the scanner's locale to the initial locale regardless of whether it was previously changed. The localized formats are defined in terms of the following parameters, which for a particular locale are taken from that locale's DecimalFormat object, df , and its and DecimalFormatSymbols object, dfs.
LocalGroupSeparator The character used to separate thousands groups, i. DecimalNumeral Exponent? Since: 1. Scanner File source, String charsetName Constructs a new Scanner that produces values scanned from the specified file.
Scanner InputStream source Constructs a new Scanner that produces values scanned from the specified input stream. Scanner InputStream source, String charsetName Constructs a new Scanner that produces values scanned from the specified input stream. Scanner Path source Constructs a new Scanner that produces values scanned from the specified file.
Scanner Path source, String charsetName Constructs a new Scanner that produces values scanned from the specified file. Scanner Readable source Constructs a new Scanner that produces values scanned from the specified source. Scanner ReadableByteChannel source Constructs a new Scanner that produces values scanned from the specified channel.
Scanner ReadableByteChannel source, String charsetName Constructs a new Scanner that produces values scanned from the specified channel. Scanner String source Constructs a new Scanner that produces values scanned from the specified string. Pattern delimiter Returns the Pattern this Scanner is currently using to match delimiters.
String findInLine Pattern pattern Attempts to find the next occurrence of the specified pattern ignoring delimiters. String findInLine String pattern Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters. String findWithinHorizon Pattern pattern, int horizon Attempts to find the next occurrence of the specified pattern. String findWithinHorizon String pattern, int horizon Attempts to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters.
Locale locale Returns this scanner's locale. MatchResult match Returns the match result of the last scanning operation performed by this scanner. String next Finds and returns the next complete token from this scanner. 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 pattern constructed from the specified string. String nextLine Advances this scanner past the current line and returns the input that was skipped. Scanner reset Resets this scanner. Scanner skip Pattern pattern Skips input that matches the specified pattern, ignoring delimiters. Scanner skip String pattern Skips input that matches a pattern constructed from the specified string.
String toString Returns the string representation of this Scanner. Scanner useDelimiter Pattern pattern Sets this scanner's delimiting pattern to the specified pattern. Scanner useDelimiter String pattern Sets this scanner's delimiting pattern to a pattern constructed from the specified String. Scanner useLocale Locale locale Sets this scanner's locale to the specified locale.
Scanner useRadix int radix Sets this scanner's default radix to the specified radix. Methods inherited from class java. Object clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait Constructor Detail Scanner public Scanner Readable source Constructs a new Scanner that produces values scanned from the specified source.
Parameters: source - A character source implementing the Readable interface Scanner public Scanner InputStream source Constructs a new Scanner that produces values scanned from the specified input stream. Bytes from the stream are converted into characters using the underlying platform's default charset. Parameters: source - An input stream to be scanned Scanner public Scanner InputStream source, String charsetName Constructs a new Scanner that produces values scanned from the specified input stream.
Bytes from the stream are converted into characters using the specified charset. Parameters: source - An input stream to be scanned charsetName - The encoding type used to convert bytes from the stream into characters to be scanned Throws: IllegalArgumentException - if the specified character set does not exist Scanner public Scanner File source throws FileNotFoundException Constructs a new Scanner that produces values scanned from the specified file.
Bytes from the file are converted into characters using the underlying platform's default charset. Bytes from the file are converted into characters using the specified charset. Parameters: source - A file to be scanned charsetName - The encoding type used to convert bytes from the file into characters to be scanned Throws: FileNotFoundException - if source is not found IllegalArgumentException - if the specified encoding is not found Scanner public Scanner Path source throws IOException Constructs a new Scanner that produces values scanned from the specified file.
Parameters: source - A string to scan Scanner public Scanner ReadableByteChannel source Constructs a new Scanner that produces values scanned from the specified channel.
Bytes from the source are converted into characters using the underlying platform's default charset. Parameters: source - A channel to scan Scanner public Scanner ReadableByteChannel source, String charsetName Constructs a new Scanner that produces values scanned from the specified channel.
Bytes from the source are converted into characters using the specified charset. Parameters: source - A channel to scan charsetName - The encoding type used to convert bytes from the channel into characters to be scanned Throws: IllegalArgumentException - if the specified character set does not exist Method Detail close public void close Closes this scanner.
If this scanner has not yet been closed then if its underlying readable also implements the Closeable interface then the readable's close method will be invoked.
If this scanner is already closed then invoking this method will have no effect. Attempting to perform search operations after a scanner has been closed will result in an IllegalStateException.
This method returns null if no such exception exists. Returns: the last exception thrown by this scanner's readable delimiter public Pattern delimiter Returns the Pattern this Scanner is currently using to match delimiters. Returns: this scanner's delimiting pattern. Parameters: pattern - A delimiting pattern Returns: this scanner useDelimiter public Scanner useDelimiter String pattern Sets this scanner's delimiting pattern to a pattern constructed from the specified String.
An invocation of this method of the form useDelimiter pattern behaves in exactly the same way as the invocation useDelimiter Pattern. Invoking the reset method will set the scanner's delimiter to the default. Parameters: pattern - A string specifying a delimiting pattern Returns: this scanner locale public Locale locale Returns this scanner's locale.
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