Скачать или смотреть java util scanner api

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sure! the `java.util.scanner` class is a part of the java standard library and is used to read input from various sources, including keyboard input, files, and streams. it provides methods to parse primitive types and strings using regular expressions.

overview of scanner

the `scanner` class provides methods to read different types of data such as:
strings
integers
doubles
booleans

how to use scanner

1. **import the scanner class**: before using `scanner`, you need to import it.
2. **create a scanner object**: you can create a `scanner` object by passing an `inputstream` (like `system.in` for keyboard input) or a `file` object for reading from a file.
3. **read input**: use the appropriate methods to read the desired data type.
4. **close the scanner**: it’s a good practice to close the `scanner` object when you're done to free up resources.

example code

here is a simple example that demonstrates how to use the `scanner` class to read different types of input from the user:



explanation of the code

1. **import statement**: we import the `scanner` class from the `java.util` package.

2. **creating a scanner object**: we create a `scanner` object named `scanner` that reads from `system.in`, which is the standard input stream (usually the keyboard).

3. **reading different types of input**:
`nextline()`: reads a line of text input (string).
`nextint()`: reads an integer value.
`nextdouble()`: reads a double (floating-point) value.
`nextboolean()`: reads a boolean value (true/false).

4. **printing output**: we print messages to the console based on the input received.

5. **closing the scanner**: after finishing the input reading, we close the `scanner` using `scanner.close()` to release the resources associated with it.

important points

**input type mismatch**: if the input does not match the expected type (e.g., entering a letter when an integer is expected), a `inputmismatchexception` will be thrown. it ...

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