Centering Text in a JTextArea or JTextPane – Horizontal Text Alignment

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You need to use a JTextPane and use attributes. The following should center all the text:

StyledDocument doc = textPane.getStyledDocument();
SimpleAttributeSet center = new SimpleAttributeSet();
StyleConstants.setAlignment(center, StyleConstants.ALIGN_CENTER);
doc.setParagraphAttributes(0, doc.getLength(), center, false);

Edit:

Vertical centering is not supported as far as I know. Here is some code you might find useful: Vertical Alignment of JTextPane

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