How do I resize the text inside my JScrollpane - JAVA

Question

I'm currently learning more about Java. I'm working on creating a GUI which is able to 'translate' amino-acid characters into their 3-letter codes.

I've got everything working as intended, but I'm still struggling to understand how I can resize the text inside my JScrollpane to not exceed the width. (Example in picture)

Do I just need to change some settings or maybe add ' 's to fit the JTextArea? Here's the code:

Thanks in advance!

private void createGUI() {
    Container window = this.getContentPane();
    window.setLayout(new FlowLayout());

    panel = new JPanel();
    inputField = new JTextField();
    startButton = new JButton("Convert to 3-letter code");
    display = new JTextPane();
    scroll = new JScrollPane(display);

    //CUSTOMIZE GUI OBJECTS
    inputField.setPreferredSize(new Dimension(200, 20));
    display.setPreferredSize(new Dimension(400, 300));
    startButton.addActionListener(this);

    //SETTING UP TEXTAREA
    display.setEditable(false);

    scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    
    panel.setLayout(new BorderLayout());
    panel.add(scroll, BorderLayout.CENTER);
    //

    window.add(inputField);
    window.add(startButton);
    window.add(panel);
}

Mihnea Andrei Ciorica · Answer

Better use a JTextArea instead of a JScrollPane since the best that the JScrollPane can do is to dynamically resize (Dynamically Resize a JScrollPane?)

Maarten van Vliet · Answer

I changed JTextPane display to a JTextArea object and changed 'display.setLineWrap(true);'

This fixed the issue I was having with JTextPane.

Hiran Chaudhuri · Answer

To answer the question in the title: How do I resize the text inside my JScrollpane

Inside your scrollpane you have some JComponent. Either that JComponent is fully visible since it is smaller or equal to the JScrollpane's viewport. Or it is bigger, in which case the JScrollpane will start displaying scrollbars and the relevant part.

To resize the text you will just have to tell the JComponent inside the JScrollpane to display the text differently. Depending on the JComponent you use this method may vary. Here some examples:

In a JLabel and most other components, increase the font size (How to change the size of the font of a JLabel to take the maximum size)
In a JLabel, switch to a multiline label (Multiline text in JLabel)
In a JTextArea, turn on word wrapping and line wrapping
In a JEditorPane you can even use markup inside the document to use different font sizes at the same time

How do I resize the text inside my JScrollpane - JAVA

3 Answers