Hey Andrew, those compilation errors are all down to using non-existent methods with the Scanner class—let's fix them step by step:

1. Why nextChar() and nextString() are causing issues #

The Java Scanner class doesn't have a nextChar() or nextString() method. These are the straightforward replacements you need:

• To get a single character: Use input.next().charAt(0) (reads the next whitespace-separated token as a string, then grabs its first character)
• To get a string: Use input.next() (reads the next whitespace-separated token) or input.nextLine() (reads an entire line of input)

2. Corrected Code #

Here's your code with the fixes applied, plus comments explaining each change:

import java.util.Scanner;
import java.io.*;

public class Tester{
    public static void main(String[] args){
        Scanner input=new Scanner(new File(args[0]));
        while(input.hasNextLine()){
            // Replace non-existent nextChar() with next().charAt(0)
            char posit = input.next().charAt(0);
            String compar = Character.toString(posit);
            
            if(compar.equals("#")){//If using manager symbol
                // Replace non-existent nextString() with next() for string input
                String firstN = input.next();
                String lastN = input.next();
                double var1 = input.nextDouble();
                Employee.Manager(firstN, lastN, var1);
            }//End if manager statement
            else if(compar.equals("*")){//If using hourly symbol
                // Replace non-existent nextString() with next() for string input
                String firstN = input.next();
                String lastN = input.next();
                double var1 = input.nextDouble();
                double var2 = input.nextDouble();
                Employee.HourlyWorker(firstN, lastN, var1, var2);
            }//End if hourly statement
        }//End while loop
    }//End main method
}//End class

3. Quick Additional Tip #

If your input lines have the symbol and all values on the same line, you might want to read the entire line first to avoid issues with leftover newline characters. Here's a quick adjustment for that:

while(input.hasNextLine()){
    String line = input.nextLine();
    Scanner lineScanner = new Scanner(line);
    char posit = lineScanner.next().charAt(0);
    // Rest of your logic using lineScanner instead of the main input scanner
}

Also, double-check that your Employee class actually has static Manager and HourlyWorker methods—if these are constructors instead, you'll need to assign them to variables (e.g., Employee manager = new Employee.Manager(...)).

内容的提问来源于stack exchange，提问作者Andrew Kubat