new scanner
时间: 2023-09-01 17:09:44 浏览: 52
回答: 如果你想要创建一个新的Scanner对象,你可以使用以下代码:
```java
Scanner scan = new Scanner(System.in);
```
这将创建一个可以从标准输入中读取数据的Scanner对象。记得在使用完Scanner对象后调用`scan.close()`来关闭Scanner对象。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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相关问题
new Scanner
The `Scanner` class in Java is used for reading input from various sources, such as the console, files, or streams. It provides various methods for reading different data types, such as `nextInt()` for reading integers, `nextDouble()` for reading double values, and `nextLine()` for reading strings.
To create a new `Scanner` object, you can use one of the following constructors:
1. `Scanner(System.in)` - creates a new `Scanner` object to read input from the console.
2. `Scanner(File)` - creates a new `Scanner` object to read input from a file.
3. `Scanner(InputStream)` - creates a new `Scanner` object to read input from an input stream.
For example, to create a new `Scanner` object to read input from the console, you can use the following code:
```
Scanner scanner = new Scanner(System.in);
```
Then, you can use various methods of the `Scanner` class to read input from the console. For example, to read an integer, you can use the `nextInt()` method:
```
int num = scanner.nextInt();
```
Similarly, to read a string, you can use the `nextLine()` method:
```
String str = scanner.nextLine();
```
scanner scanner = new scanner是什么意思
这段代码有语法错误,应该是小写的 `Scanner scanner = new Scanner(System.in);`。
这行代码的作用是创建一个 `Scanner` 对象,用于从控制台读取用户的输入。`Scanner` 是 Java 标准库中提供的一个类,可以方便地从各种来源读取数据,例如控制台、文件等。`System.in` 表示从控制台读取数据,而 `new Scanner(System.in)` 则是创建一个使用控制台输入的 `Scanner` 对象。 `scanner` 是创建的 `Scanner` 对象的名称,可以根据需要自己命名。