GUI.java

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package homework;

import java.awt.Dimension;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

/**
 *
 * @author Marlon
 */
public class GUI {

    String fileName;
    File file;
    FileReader fr;
    BufferedReader br;
    StringTokenizer tk;
    StringTokenizer tk2;
    JFrame frame;
    JTable table;
    ArrayList<String> daten = new ArrayList<>();

    public void start() {
        String[] spalten = new String[4];
        Object[][] zeilen = new Object[100][100];
        daten = dateiEinlesen();
        int i = 0;
        for (i = 0; i < daten.size(); i++) {

            if (i == 0) {

                String ersteZeile = daten.get(i);
                tk = new StringTokenizer(ersteZeile, ";");
                for (int o = 0; tk.hasMoreTokens(); o++) {

                    spalten[o] = tk.nextToken();
                }

            } else {

                String zweitezeile = daten.get(i);
                tk2 = new StringTokenizer(zweitezeile, ";");
                for (int k = 0; tk2.hasMoreTokens(); k++) {

                    zeilen[i-1][k] = tk2.nextToken();
                }

            }

        }
        // JTable erstellen
        frame = new JFrame();
        table = new JTable(zeilen, spalten);
        table.setPreferredScrollableViewportSize(new Dimension(500, 50));
        table.setFillsViewportHeight(true);
        JScrollPane scrollPane = new JScrollPane(table);
        frame.add(scrollPane);
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        frame.setVisible(true);
        frame.pack();
    }

    public ArrayList<String> dateiEinlesen() {
        ArrayList<String> array = new ArrayList<>();

        try {
            fr = new FileReader("liste.txt");
            br = new BufferedReader(fr);
            try {
                String line;
                while (br.ready()) {

                    line = br.readLine();
                    System.out.println(line);
                    array.add(line);

                }
            } catch (IOException ex) {
                Logger.getLogger(GUI.class.getName()).log(Level.SEVERE, null, ex);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(GUI.class.getName()).log(Level.SEVERE, null, ex);
        }

        return array;
    }

}

Homework.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package homework;

/**
 *
 * @author Marlon
 */
public class Homework {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        GUI gui = new GUI();
        
        gui.start();
    }
    
}