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I'm trying to clear the JTextArea.
Currently, I'm using
jtextarea.setText(null); What is the difference if I use
jtextarea.setText(""); 
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Press Enter to accept the completion or continue typing. The following code adds a document listener to the text area's document: textArea.
To disable JtextField/JTextArea, call the method setEnabled() and pass the value “false” as parameter. JTextField textField = new JTextField(); textField.
Java Program to Clear JTextArea by Clicking JButton: super("Clear the contents of a JTextArea"); JButton clearButton = new JButton("Clear"); clearButton.
Syntax: JButton jb_clear=new JButton("Clear"); Many times you have to clear the text field in java. This can be done by calling the clear() method of the JTextField class.
There is no difference. They both have the effect of deleting the old text. From the java TextComponent page:
setText
public void setText(String t) Sets the text of this TextComponent to the specified text. If the text is null or empty, has the effect of simply deleting the old text. When text has been inserted, the resulting caret location is determined by the implementation of the caret class. Note that text is not a bound property, so no PropertyChangeEvent is fired when it changes. To listen for changes to the text, use DocumentListener. Parameters: t - the new text to be set See Also: getText(int, int), DefaultCaret What the author was trying to was clear the JTextArea, not add a null character to it!
JTextArea0.selectAll(); JTextArea0.replaceSelection(""); This selects the entire textArea and then replaces it will a null string, effectively clearing the JTextArea.
Not sure what the misunderstanding was here, but I had the same question and this answer solved it for me.
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