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The Scanner class in Java is used for parsing primitive types and strings using regular expressions. This class can be used to read input from various sources like input streams, files, or strings. The Scanner class is a part of the java.util package and provides many methods for reading and processing different types of input.
This guide covers various methods available in the Scanner class. Each method is described in simple terms to help beginners understand how to use them. These methods enable reading different data types, checking for available input, and parsing tokens from the input.
For more detailed information, please refer to the official Java SE Documentation.
Java Scanner Class Methods
The table below contains various methods of the Java Scanner class, each with a link to a detailed explanation, examples, and real-world uses. Click on the method names to learn more about how to use them effectively in your applications.
| Method | Description |
|---|---|
| close() | Closes the scanner, releasing any resources associated with it. |
| delimiter() | Returns the current delimiter used by the scanner. |
| findAll() | Finds and returns a stream of match results for the specified pattern. |
| findInLine() | Attempts to find the next occurrence of a pattern within the current line. |
| hasNext() | Returns true if the scanner has another token in its input. |
| hasNextInt() | Returns true if the next token in the scanner can be interpreted as an int value. |
| hasNextLine() | Returns true if there is another line in the input of this scanner. |
| match() | Returns the match result for the last scanning operation performed by this scanner. |
| next() | Finds and returns the next complete token from this scanner. |
| nextBigDecimal() | Scans the next token as a BigDecimal. |
| nextBigInteger() | Scans the next token as a BigInteger. |
| nextBoolean() | Scans the next token as a boolean value. |
| nextByte() | Scans the next token as a byte value. |
| nextDouble() | Scans the next token as a double value. |
| nextFloat() | Scans the next token as a float value. |
| nextInt() | Scans the next token as an int value. |
| nextLine() | Advances the scanner past the current line and returns the input that was skipped. |
| nextLong() | Scans the next token as a long value. |
| nextShort() | Scans the next token as a short value. |
| tokens() | Returns a stream of delimiter-separated tokens from this scanner. |
| useDelimiter() | Sets the scanner's delimiting pattern. |
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