cannot find symbol -- symbol : method lastIndexOf(java.lang.String) location: class java.util.Scanner

My code tries to extract a filename to load a file from reading another file that contains the filename:

public static void main(String[] args) throws IOException
{
    Scanner scan;
    String transFilename;
    String filename;

    scan = new Scanner(System.in);
    System.out.print("Enter the name of your transaction file please (include .txt extension): ");
    transFilename = scan.nextLine();
    scan = new Scanner(new FileReader(transFilename));

    filename = readLine.next(2,readLine.lastIndexOf(""));    
    Scanner input = new Scanner( new FileReader(filename));   
}

the Error generated:

blah.java:72: cannot find symbol
symbol  : method lastIndexOf(java.lang.String)
location: class java.util.Scanner
            filename = readLine.ne开发者_JAVA百科xt(2,readLine.lastIndexOf(""));    
                                               ^
1 error

The same error is generated when i tried to use ".length" method that should be built into java...

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It seems readLine is of type Scanner and you are trying to invoke lastIndexOf() but thi method doesn't belong to Scanner class

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Your readLine is java.util.Scanner... I guess you're thinking that it's a java.lang.String.