FileReaderDemo.java

import java.io.IOException;
import java.io.FileReader;
import java.io.BufferedReader;

public class FileReaderDemo
{
    private BufferedReader reader;

    public void open(String path)
    {
        try
        {
            FileReader finReader = new FileReader(path);
            reader = new BufferedReader(finReader);
        }
        catch (IOException e)
        {
            e.printStackTrace();
            reader = null;
        }
    }

    public String readLine()
    {
        if (reader == null)
            return null;

        try
        {
            return reader.readLine();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public String[] readTokens(String pattern)
    {
        if (reader == null)
            return null;

        String line;
        try
        {
            line = reader.readLine();
        }
        catch (IOException e)
        {
            e.printStackTrace();
            return null;
        }

        if (line == null)
            return null;

        return line.split(pattern);
    }

    public void close()
    {
        try
        {
            reader.close();
            reader = null;
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    public boolean isOpen()
    {
        return reader != null;
    }

    public static void main(String[] args) {
        FileReaderDemo demo = new FileReaderDemo();
        demo.open("demo.txt");

        String[] tokens;
        while ((tokens = demo.readTokens(";")) != null)
        {
            System.out.print("Zeile:");
            for (int i = 0; i < tokens.length; i++)
            {
                System.out.print(" - " + tokens[i]);
            }
            System.out.println();
        }
    }
}