java read keyboard input
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reading keyboard input in java can be accomplished using several methods. the most common approaches are using the `scanner` class and the `bufferedreader` class. below, i’ll provide an informative tutorial on both methods along with code examples.
method 1: using the scanner class
the `scanner` class is a part of the `java.util` package and provides a simple way to read input from various sources, including keyboard input.
#### step-by-step guide
1. **import the scanner class**: to use the `scanner` class, you need to import it at the beginning of your java program.
2. **create a scanner object**: instantiate a `scanner` object to read input from `system.in`, which represents the standard input stream (keyboard).
3. **read input**: use methods such as `nextline()`, `nextint()`, `nextdouble()`, etc., to read different types of input.
4. **close the scanner**: it's a good practice to close the `scanner` object to free up resources.
#### code example
method 2: using bufferedreader
the `bufferedreader` class is part of the `java.io` package and is used to read text from a character input stream efficiently. it reads data in larger chunks, which can be more efficient than using `scanner`.
#### step-by-step guide
1. **import the required classes**: you'll need to import `bufferedreader` and `inputstreamreader`.
2. **create a bufferedreader object**: initialize a `bufferedreader` to read from `system.in`.
3. **read input**: use the `readline()` method to read a line of text.
4. **handle exceptions**: since `bufferedreader` can throw `ioexception`, you should handle this exception.
5. **close the bufferedreader**: just like with the `scanner`, it’s important to close the `bufferedreader`.
#### code example
summary
**scanner**: easier to use and provides methods to parse different types of input directly.
**bufferedreader**: more efficient for reading large amounts of text, but requires more code for parsing.
both methods are commonly used, ...
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