Java 如何将扫描仪对象设为静态
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how to make scanner object as static
提问by Tethys0
how can i refer to Scanner object which is defined globally from a static method(say main() ).. That is, how to make Scanner object as static.
我如何引用从静态方法（比如 main() ）全局定义的 Scanner 对象。也就是说，如何将 Scanner 对象设为静态。
Program (# for reference to my problem) :
程序（# 参考我的问题）：
import java.util.Scanner;
class spidy {
Scanner input = new Scanner(System.in); /*DECLARING SCANNER OBJECT OUTSIDE MAIN METHOD i.e Static method */
public static void main(String args[]) {
System.out.println("Enter a number");
int n = input.nextInt();
}
}
Error: non static variable input cannot be referenced from the static content
错误：不能从静态内容中引用非静态变量输入
采纳答案by adityaekawade
I had faced a similar doubt while solving a problem on Static Initializer Block. And there is a simple solution to it.
在解决静态初始化程序块的问题时，我也遇到过类似的疑问。并且有一个简单的解决方案。
Write as:
写成：
static Scanner input = new Scanner(System.in);
Instead of :
代替 ：
Scanner input = new Scanner(System.in);
回答by Elliott Frisch
If I understand your question, then you could change this
如果我理解你的问题，那么你可以改变这个
Scanner input = new Scanner(System.in);
to (visible to all other classes - you said global)
to（对所有其他类可见 - 你说的是global）
public static Scanner input = new Scanner(System.in);
or (visible to the current class - any other static method (main()in your case) )
或（对当前类可见 - 任何其他静态方法（main()在您的情况下））
private static Scanner input = new Scanner(System.in);
回答by Suthan Srinivasan
Just use statickeyword before Scannerclass.
只需static在Scanner上课前使用关键字。
Example:
例子：
static Scanner scan=new Scanner(System.in);
By using the scan object we refer anywhere in the code
通过使用 scan 对象，我们可以在代码中的任何地方引用
