CODEWITHSUNDEEP
javaeclipseimportpackageprogram-entry-point
woollyMammoth
woollyMammoth

Reputation: 105

Eclipse error when trying to run Java application - "Selection does not contain a main type" - But it does?

I have created a Java package, Matrix. When I attempt to run it, I get the error "Selection does not contain a main type". But, as the code that I've copied and pasted from the class DriverMatrix shows, there is a main method declaration. I have attempted to restart Eclipse and I still get the error. I created the package called Matrix, then imported .java files for each class. Anyone know what's going on here? Here is the main declaration along with just a bit of code: 

package Matrix;

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

public class DriverMatrix 
{

static private IntegerArithmetics integerArithmetics = new IntegerArithmetics();
static private DoubleArithmetics doubleArithmetics = new DoubleArithmetics();

public static void main(String[] args) throws FileNotFoundException
{
    Scanner inFile = new Scanner (new FileReader("in.txt"));
    PrintWriter outFile = new PrintWriter("out.txt");

    Matrix<Integer,IntegerArithmetics> matrix1 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,3);
    Matrix<Integer,IntegerArithmetics> matrix2 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,3);
    Matrix<Integer,IntegerArithmetics> matrix3 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,3);
    Matrix<Integer,IntegerArithmetics> matrix4 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,3);
    Matrix<Integer,IntegerArithmetics> matrix5 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,3,2);
    Matrix<Integer,IntegerArithmetics> matrix6 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,2);

Upvotes: 0

Views: 587

Answers (2)

Arif Samin
Arif Samin

Reputation: 257

According to your code

Matrix<Integer,IntegerArithmetics> matrix1 = new Matrix<Integer,IntegerArithmetics>(integerArithmetics,2,3);

it seems that you have a package and class with both entitled as Matrix. Try to change this first as naming conflict will obviously cause error.

Source: Naming a package

Upvotes: 1

Juned Ahsan
Juned Ahsan

Reputation: 68715

There seems to be a Matrix class and package name conflict in your project and it may be leading to eclipse error. Try renaming one of those and then run your application.

Upvotes: 2

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