Java程序不喜欢这个词 "Scanner"

Question

import java.lang.*;
import java.util.*;
import java.io.PrintWriter;
import java.io.FileReader;
import java.io.IOException;

public class Test
{
  public static void main(String[] args) throws IOException
  {
    Scanner infile = new Scanner(new FileReader("historyGrades.txt"));
    boolean[] correctAnswers = new boolean[20];
    infile.close();
  }
}

由于某种原因我收到这些错误:

C:\Users\Rawr\Documents\Test.java:11: cannot resolve symbol
symbol  : class Scanner 
location: class Test
    Scanner infile = new Scanner(new FileReader("historyGrades.txt"));
    ^
C:\Users\Rawr\Documents\Test.java:11: cannot resolve symbol
symbol  : class Scanner 
location: class Test
    Scanner infile = new Scanner(new FileReader("historyGrades.txt"));
                         ^
2 errors

Tool completed with exit code 1

我不知道发生了什么。 感谢您的帮助，谢谢。

Answer 1

您使用的是哪个版本的 Java？ 扫描仪是在1.5中添加的。