Скачать или смотреть java using scanner

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java scanner tutorial

the `scanner` class in java is part of the `java.util` package and is used for obtaining input from various sources like keyboard input, files, or strings. this tutorial will focus on using the `scanner` class to read input from the keyboard.

#### step 1: importing the scanner class

before using the `scanner` class, you need to import it from the `java.util` package. you can do this by adding the following line at the beginning of your java program:



#### step 2: creating a scanner object

to read input, you need to create an instance of the `scanner` class. this is typically done by creating a new `scanner` object that takes `system.in` as an argument, which represents standard input (usually the keyboard).



#### step 3: reading input

the `scanner` class provides several methods to read different types of input, such as:

`nextint()`: reads an integer.
`nextdouble()`: reads a double.
`nextline()`: reads a line of text (string).
`next()`: reads the next token (word).

#### step 4: closing the scanner

it's good practice to close the `scanner` object after you're done using it. this will free up resources associated with it.



complete code example

here’s a complete example that demonstrates how to use the `scanner` class to read various types of user input:



explanation of the code:

1. **import statement**: `import java.util.scanner;` imports the `scanner` class.

2. **scanner object creation**: `scanner scanner = new scanner(system.in);` creates a `scanner` object that reads from the standard input.

3. **reading input**:
`string name = scanner.nextline();` reads a full line of input and stores it in the `name` variable.
`int age = scanner.nextint();` reads an integer input and stores it in the `age` variable.
`double height = scanner.nextdouble();` reads a double value for height.

4. **output**: the program then outputs the collected information.

5. **closing the scanner**: `scanner.close(); ...

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