Schriftart über einen Button ändern

Bitte aktiviere JavaScript!
Hallo. Ich habs leider immer noch nicht geschaft bei diesem SpeedReader einen Button der die Schriftart ändert einzufügen und wollte deshalb erneut um Hilfe fragen ^^

package reader;

import javax.swing.*;   //used for user interface
import javax.swing.text.SimpleAttributeSet; //used for changing fonts
import javax.swing.text.StyleConstants; //text styles
import javax.swing.text.StyledDocument; //text styles
import java.awt.*;
import java.awt.event.ActionListener;   //listens for mouse clicks on buttons
import java.awt.event.ActionEvent;  //handles button press events
import;   //handles file exceptions
import;  //file reader for file input
import java.util.Scanner;   //scanner for input
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class Reader {

    JFrame guiFrame;    //initiate main window frame
    JPanel optPanel;    //initiate option panel
    JFileChooser fileDialog;    //initiate fileDialog
    JTextPane textPane;     //initiate textPane

    int pause = 265;    //set initial reading speed to 200wpm
    int f = 1;      //tracks the colour scheme
    String filePath;    //holds location of the selected file

    public static void main(String[] args) {
         //Use the event dispatch thread for Swing components
         EventQueue.invokeLater(new Runnable()
             public void run()
                 new Reader();

    public Reader() //Create JFrame and all components
        guiFrame = new JFrame();    //create new instance of the main window
        guiFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);   //program will exit if window closed
        guiFrame.setTitle("Reader Window");     //title of main window
        guiFrame.setSize(500,200);      //set the size of the main window
        guiFrame.setLocationRelativeTo(null);   //put the window in the middle of the screen
        guiFrame.setLayout(new BorderLayout()); //initiate layout of guiframe

        fileDialog = new JFileChooser();//"C:\\Documents and Settings\\Owner\\My Documents" used to select file to read

        textPane = new JTextPane();     //create new instance of the textpane
        textPane.setEditable(false);    //user cannot edit text in textpane
        Font font = new Font("Serif", Font.BOLD, 22);   //set font and size
        textPane.setFont(font); //set font of textpane
        StyledDocument doc = textPane.getStyledDocument();  //styled document allows allignment options
        SimpleAttributeSet center = new SimpleAttributeSet();       //attribute set to control center alignment
        StyleConstants.setAlignment(center, StyleConstants.ALIGN_CENTER);   //Align text to the center
        doc.setParagraphAttributes(0, doc.getLength(), center, false);  //set formatting options
        textPane.setText("Choose a speed, open a file and start reading");  //initial contents of textpane
        textPane.setVisible(true);      //set textpane to visible
        guiFrame.add(textPane, BorderLayout.CENTER);    //add textpane with word output in center to guiframe

        optPanel = new JPanel();        //add an instance of optPanel
        optPanel.setLayout(new GridLayout(1,3));   //set layout of buttons 1 high by 3 wide
        guiFrame.add(optPanel,BorderLayout.NORTH);  //Put the buttons at the bottom of the window

        JButton openButton = new JButton("Open File");  //Create new button
        openButton.setActionCommand("Open File");
        openButton.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)
            {   //event happens if file button pressed
                try {
                    openFile();     //call open file method to display file selection window
                } catch (Exception e) {     //catch exception
                    e.printStackTrace();    //used to identify problems
        optPanel.add(openButton);   //add open file button to option panel

        JButton speedButton = new JButton("Select WPM");  //Create new button
        speedButton.setActionCommand("Select WPM");
        speedButton.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)
            {   //event happens if user clicks button
                try {
                    setSpeed();     //call set speed method to display speed window
                } catch (Exception e) { //catch exception
                    e.printStackTrace();    //used to identify problems
        optPanel.add(speedButton);  //Add speed selection button to option panel

        JButton changeColours = new JButton("change color");  //Add button to invert colour scheme
        changeColours.setActionCommand("change color");
        changeColours.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {    //event happens when user clicks button---
                try {
                    if (f == 1) {       //check the current color settings. Currently black on white
                        textPane.setForeground(;    //set text colour to white
                        f = 0;          //tracks colour settings
                    } else {                //check the current color settings. currently white on black
                        f = 1;          //tracks colour settings
                } catch (Exception e) {   //catch exception
                    e.printStackTrace();    //used to identify problems
        optPanel.add(changeColours);    //add the colour button to option panel
         JSpinner changeFontSize = new JSpinner(
                new SpinnerNumberModel(22, 10, 78, 2));

        changeFontSize.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {

    //Show a open file dialog box
    private void openFile() throws Exception {  //exception needed to handle files
        int openChoice = fileDialog.showOpenDialog(guiFrame);   //display file chooser window
        if (openChoice == JFileChooser.APPROVE_OPTION){     //user selects a file from file chooser window
            filePath = fileDialog.getSelectedFile().getPath();  //set filepath as the path of the file selected in the filedialog window
            (new Thread(new displayText())).start();    //Start displayText method in separate thread to avoid gui freeze
    private void setSpeed(){        //Method called if speed button pressed
        String[] speeds = { "200", "300", "500", "800" };   //String holds values for drop down box
        JFrame frame = new JFrame("Input required speed in words per minute");  //new frame to select speed
        String speedChoice = (String) JOptionPane.showInputDialog(frame,    //option pane used for easy speed selection
                "What speed would you like?",   //display question to user
                "WPM",          //window title
                JOptionPane.QUESTION_MESSAGE,   //standard for option pane
                speeds, //add the string of speeds as options
                speeds[0]); //default is 200
            pause = 265;                    //187 words in 59.877s that's 187.38414wpm (without natural reading pauses)
        else if(speedChoice.equals("300"))
            pause = 160;                    //187 words in 38.522s that's 291.26215wpm (without natural reading pauses)
        else if(speedChoice.equals("500"))
            pause = 75;                     //187 words in 22.451s that's 499.75504wpm (without natural reading pauses)
        else if(speedChoice.equals("800"))
            pause = 28;                     //187 words in 14.006s that's 801.08527wpm (without natural reading pauses)

    public class displayText implements Runnable {  //Run all the display text method within its own thread. Prevents the GUI from becoming unresponsive
        public void run(){
            Scanner in = null;     //Scanner to read the file at chosen location
            try {
                in = new Scanner(new FileReader(filePath));
            } catch (FileNotFoundException e) {   //ignore exception
                e.printStackTrace();    //used to identify problems
            int i =0;       //Number of words in document
            while(in.hasNextLine()){        //read every line of file
      ;      //move to next word
                i++;            //increment word counter
            in.close();     //Close Scanner after words have been counted

            try {
                in = new Scanner(new FileReader(filePath));     //New Scanner to start at top of file
            } catch (FileNotFoundException e) {   //ignore exception
                e.printStackTrace();    //used to identify problems
            String[] word = new String[i];      //Array stores each word

            int n = 0;
            long start =0, end; //used to calculate words per minute
            float time;     //will hold time taken to finish article
            float wPM;         //will hold number of words per minute

            for(int k=0; k<i; k++){ //loop cycles through every word in file
                //FROM HERE
                if(k==0){       //check if at start of loop
                    start = System.currentTimeMillis();    //Start time used to calculate words per minute
                else if(k==(i-1)){      //check if at end of loop
                    end = System.currentTimeMillis();   //end time used to calculate words per minute
                    time = (end-start);     //time taken = end time - start time
                    wPM = (60/(time/1000))*i;     //words per minute = time in minutes * words read
                    System.out.println(i + " words in " + (time/1000) + "s" + " that's " + wPM + "wpm");    //print results in system dialog
                //TO HERE is just used to show how many words were read. Used to calculate how much pause to set.

                word[k] =;        //get next word from file
                //Natural reading speeds and pauses attempt (needs research)
                if(word[k].length()>=5 && word[k].length()<=8) n = 100;     //short pause for words with 5-8 characters
                else if(word[k].length()>=9 && word[k].length()<=12) n = 150;   //medium pause for words with 9-12 characters
                else if(word[k].length()>12) n = 200;       //long pause for words over 12 characters
                for(int j=0; j<word[k].length(); j++){      //loop cycles through length of word
                    if(word[k].charAt(word[k].length()-1) == '.')   //Add pause after a full stop
                        n += 50;
                    if(word[k].charAt(word[k].length()-1) == ',')   //Add slight pause after a comma
                        n += 30;
                textPane.setText(word[k]);  //Set the word in the text pane to the word read from file
                sleep(pause+n);     //call sleep method to add a pause after the word. n adds custom pause
                n=0;            //n set back to 0 after each word

    private void sleep(int i) {     //Adds a pause between words. i changes length of pause
        try {
            Thread.sleep(i);        //sleep thread for pause+n milliseconds
        } catch(InterruptedException e) {   //exception needed for sleep
            //do nothing


        JComboBox<String> changeFont = new JComboBox<>(GraphicsEnvironment.
        changeFont.addActionListener(e -> 
                textPane.setFont(new Font(changeFont.getItemAt(changeFont.getSelectedIndex()), 
Wieder vor guiFrame.setVisible(true); einfügen.
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