Scanner scanner = new Scanner(System.in);

This line of code creates a new instance of the Scanner class and assigns it to the variable named "scanner". The Scanner class is used to read user input from the console. The argument "System.in" specifies that the Scanner should read from the standard input stream, which is typically the keyboard. This line of code is commonly used at the beginning of a program when the program needs to accept input from the user.

相关问题

scanner in=new scanner(system.

in)是什么意思？

"scanner in=new scanner(system.in)" 意思是创建一个名为 "in" 的 Scanner 对象,并将其关联到标准输入。这样就可以使用该对象来读取用户在控制台输入的数据。

Scanner input=new Scanner(System.in);和Scanner scanner = new Scanner(System.in)区别

两者的作用都是创建一个Scanner对象来接收用户的输入，但是变量名不同。

第一种方式创建的Scanner对象的变量名为input。使用方法如下：

Scanner input = new Scanner(System.in);
int num = input.nextInt();

第二种方式创建的Scanner对象的变量名为scanner。使用方法如下：

Scanner scanner = new Scanner(System.in);
int num = scanner.nextInt();

实际上，变量名的选择没有具体的规定，可以根据个人喜好来选择。