import java.io.FileWriter;
import java.io.IOException;

public class Program01 {
	public static FileWriter openFile() {
		FileWriter fw = null;
		try {
			fw = new FileWriter("adat.txt", true);
		} catch(IOException ex) {
			System.err.println("Hiba a fájl megnyitása során!");
		}
		return fw;
	}
	public static void writeFile(FileWriter fw) {
		try {
			tryWriteFile(fw);
		}catch(IOException ex) {
			System.err.println("Hiba a fájlba írás során!");
		}
	}
	public static void tryWriteFile(FileWriter fw) throws IOException {		
		fw.write("alma");		
	}
	public static void closeFile(FileWriter fw) {
		try {
			fw.close();
		} catch(IOException ex) {
			System.err.println("Hiba fájl bezárása során!");
		}
	}
	public static void main (String args[]) {
		FileWriter fw = openFile();
		writeFile(fw);
		closeFile(fw);
	}
}