After adding JTextArea into JScrollPane here: scroll = new JScrollPane(display); You don’t need to add it again into other container like you do: middlePanel.add(display); Just remove that last line of code and it will work fine. Like this: middlePanel=new JPanel(); middlePanel.setBorder(new TitledBorder(new EtchedBorder(), “Display Area”)); // create the middle panel components display = new JTextArea(16, … Read more
JTextArea.setWrapStyleWord(true)?
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
Use the JTextArea#setLineWrap method. This is also illustrated in the Swing JTextArea tutorial
JTextArea is meant to entertain Plain Text. The settings applied to a single character applies to whole of the document in JTextArea. But with JTextPane or JEditorPane you have the choice, to colour your String Literals as per your liking. Here with the help of JTextPane, you can do it like this : import java.awt.*; … Read more
public static boolean isParsable(String input) { try { Integer.parseInt(input); return true; } catch (final NumberFormatException e) { return false; } }
When using JDK1.4.2 (or earlier) the most common suggestion you will find in the forums is to use code like the following: textArea.append(…); textArea.setCaretPosition(textArea.getDocument().getLength()); However, I have just noticed that in JDK5 this issue has actually been resolved by an API change. You can now control this behaviour by setting a property on the DefaultCaret … Read more