java qr code reader webcam The Scanner Constructors in Java

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The Scanner Constructors
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Creates a Scanner that uses the Readable object specified by from as a source for input Creates a Scanner that uses the ReadableByteChannel specified by from as a source for input Creates a Scanner that uses the ReadableByteChannel specified by from with the encoding specified by charset as a source for input Creates a Scanner that uses the string specified by from as a source for input
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18:
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javautil Part 2: More Utility Classes
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This next line creates a Scanner that reads from standard input, which is the keyboard by default:
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Scanner conin = new Scanner(Systemin);
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This works because Systemin is an object of type InputStream Thus, the call to the constructor maps to Scanner(InputStream) The next sequence creates a Scanner that reads from a string
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String instr = "10 9988 scanning is easy"; Scanner conin = new Scanner(instr);
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Scanning Basics
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Once you have created a Scanner, it is a simple matter to use it to read formatted input In general, a Scanner reads tokens from the underlying source that you specified when the Scanner was created As it relates to Scanner, a token is a portion of input that is delineated by a set of delimiters, which is whitespace by default A token is read by matching it with a particular regular expression, which defines the format of the data Although Scanner allows you to define the specific type of expression that its next input operation will match, it includes many predefined patterns, which match the primitive types, such as int and double, and strings Thus, often you won t need to specify a pattern to match In general, to use Scanner, follow this procedure: 1 Determine if a specific type of input is available by calling one of Scanner s hasNextX methods, where X is the type of data desired 2 If input is available, read it by calling one of Scanner s nextX methods 3 Repeat the process until input is exhausted As the preceding indicates, Scanner defines two sets of methods that enable you to read input The first are the hasNextX methods, which are shown in Table 18-15 These methods determine if the specified type of input is available For example, calling hasNextInt( ) returns true only if the next token to be read is an integer If the desired data is available, then you read it by calling one of Scanner s nextX methods, which are shown in Table 18-16 For example, to read the next integer, call nextInt( ) The following sequence shows how to read a list of integers from the keyboard
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Scanner conin = new Scanner(Systemin); int i; // Read a list of integers while(coninhasNextInt()) { i = coninnextInt(); // }
Part II:
The Java Library
Method boolean hasNext( ) boolean hasNext(Pattern pattern) boolean hasNext(String pattern) boolean hasNextBigDecimal( ) boolean hasNextBigInteger( )
Description Returns true if another token of any type is available to be read Returns false otherwise Returns true if a token that matches the pattern passed in pattern is available to be read Returns false otherwise Returns true if a token that matches the pattern passed in pattern is available to be read Returns false otherwise Returns true if a value that can be stored in a BigDecimal object is available to be read Returns false otherwise Returns true if a value that can be stored in a BigInteger object is available to be read Returns false otherwise The default radix is used (Unless changed, the default radix is 10)
boolean hasNextBigInteger(int radix) Returns true if a value in the specified radix that can be stored in a BigInteger object is available to be read Returns false otherwise boolean hasNextBoolean( ) boolean hasNextByte( ) Returns true if a boolean value is available to be read Returns false otherwise Returns true if a byte value is available to be read Returns false otherwise The default radix is used (Unless changed, the default radix is 10) Returns true if a byte value in the specified radix is available to be read Returns false otherwise Returns true if a double value is available to be read Returns false otherwise Returns true if a float value is available to be read Returns false otherwise Returns true if an int value is available to be read Returns false otherwise The default radix is used (Unless changed, the default radix is 10) Returns true if an int value in the specified radix is available to be read Returns false otherwise Returns true if a line of input is available Returns true if a long value is available to be read Returns false otherwise The default radix is used (Unless changed, the default radix is 10) Returns true if a long value in the specified radix is available to be read Returns false otherwise Returns true if a short value is available to be read Returns false otherwise The default radix is used (Unless changed, the default radix is 10) Returns true if a short value in the specified radix is available to be read Returns false otherwise
boolean hasNextByte(int radix) boolean hasNextDouble( ) boolean hasNextFloat( ) boolean hasNextInt( )
boolean hasNextInt(int radix) boolean hasNextLine( ) boolean hasNextLong( )
boolean hasNextLong(int radix) boolean hasNextShort( )
boolean hasNextShort(int radix) TABLE 18-15
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