Scrittura su file con JFileChooser

[rugrag]

Ecco il Main

import java.io.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
import javax.swing.JFileChooser;

public class ProveVarie {

    public static void main(String[] args) throws FileNotFoundException, IOException {
        
        
        StampaMat st = new StampaMat();
        boolean ff = st.MakeMat(); 
        if (ff == true)
            
                    st.PrintMat();
    }
    
}