import java.io.*;
import java.lang.*;

class Database {
	public String filename;
	private BufferedReader fh;
	public void Database( String filename ) throws FileNotFoundException{
		fh = new BufferedReader(new FileReader(filename));
	};
};


public class ProjectMain {
	/** doc */
	public static void main(String[] args) {
	    /* doc */
            System.out.println("---");
	    Database db = new Database("sample.txt");
	    System.out.println("---");
	}
}



on compile gives this:
---------- JavaC ----------
D:\_PRO\Pi\proj\ProjectMain.java:18: cannot find symbol
symbol  : constructor Database(java.lang.String)
location: class Database
		Database db = new Database("sample.txt");
                              ^
1 error

Output completed (0 sec consumed) - Normal Termination