java - 简单的字符串错误

Question

我正在尝试在java中创建一个字符串方法，它提示某人输入长度超过三个字符的字符串。输入后，我想显示该字符串的中间三个字符。有问题，因为它没有编译。谁能看到我的错误吗？我找不到它。谢谢。

//MyString.java
import java.util.Scanner; 
 public class MyString .java {


    public static void main (String[] args) 
    {    

String string;


Scanner scan = new Scanner(System.in);
System.out.println ("Enter a string with a minimum of three characters: " + string); 
string = scan.nextLine();

System.out.println ("You entered: " + string);

String middle3;

System.out.println ("The middle three characters of the string: " + middle3);


    }


}

Answer 1

public class MyString .java {

这是错误的。删除“.java”