当我从命令行运行 Main 时，Java 在同一个 package 中找不到 class

Question

I moved a class from Main.java into their own.java files and now the IDE (IntelliJ) can't find them, even though they are in the same package. Here are the first lines of Main...

package readability;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        var filePath = args[0];
        var textAnalyser = new TextAnalyser(filePath);

... and here's the error I get when I run it from the command line:

C:\Users\123md\IdeaProjects\Readability Score\Readability Score\task\src\readability>java Main.java in.txt
Main.java:8: error: cannot find symbol
        var textAnalyser = new TextAnalyser(filePath);
                               ^
  symbol:   class TextAnalyser
  location: class Main

Interestingly, when I just say String filePath = "in.txt" and run it in the console, it does find the class and runs fine, so why can't it find the class when I run it from the command line? Thanks!

Answer 1

You can only run single *.java file with java command. If your program uses mutiple files, you have to compile it first:

javac readability/Main.java readability/TextAnalyser.java

and then run:

java readability.Main in.txt

For more info see: https://openjdk.java.net/jeps/330