compiling error should be a simple fix.

[bottlecap]

I'm using the Deitel Java how to program 7th edition and am totally stuck on this 1 error. It's really bugging me, I'm usually able to figure out the error on my own, but can't in this case...

import java.util.Scanner; // imports Scanner

public class GradeBookTest
{
	// main method begins program execution
	public static void main( String args[] )
	{
		// create Scanner to obtain input
		Scanner input = new Scanner( System.in );
		
		// create a GradeBook object and assign it to myGradeBook
		GradeBook myGradeBook = new GradeBook();
		
		// prompt for and input course name
		System.out.println( "Please enter the course name:" );
		String nameOfCourse = input.nextLine(); // read a line of text
		System.out.println(); // outputs a blank line
		
		// call myGradeBooks displayMessage method
		// and pass nameOfCourse as an argument.
		myGradeBook.displayMessage( nameOfCourse ); *** error **
		} // end main

} // end class GradeBook Test

The compiler error is:

GradeBookTest.java:24: displayMessage() in GradeBook cannot be applied to (java.lang.String)
myGradeBook.displayMessage( nameOfCourse );
^
1 error

Here's the code for GradeBook:

public class GradeBook
{
	public void displayMessage()
	{
		System.out.println( "Welcome to the Grade Book!");
	}
}

For what it's worth GradeBook compiles w/o issue.


Thanks for the help!

[Fubarable]

The problem as I see it is that GradeBook has a displayMessage() method, but not a displayMessage method that takes a String as a parameter.

For a more helpful reply though, you'll need to post the code of the GradeBook class, no?

[Fubarable]

OK, I'm right: you're calling displayMessage by passing a String parameter:

myGradeBook.displayMessage( nameOfCourse ); // nameOfCourse is the String parameter

Your displayMessage method as written accepts no parameters:

	public void displayMessage() // *** this method accepts no parameters
	{
		System.out.println( "Welcome to the Grade Book!");
	}

The solution: either call the method without a parameter, or create an overload that accepts a String parameter.