Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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What is the purpose of the JTextArea's append() method?

  1. Sets new text in the JTextArea

  2. Adds text at the specified index

  3. Appends text to the existing content

  4. Clears the current text and adds new content

The correct answer is: Appends text to the existing content

The append() method in JTextArea is specifically used to add text to the existing content in the JTextArea. This means that the current content will not be cleared and the new text will be added at the end, making it useful for continuous updates or adding on to previous text. Option A is incorrect because setText() is the method used to completely change the text in JTextArea. Option B is incorrect because insert() is the method used to add text at a specific index, not append(). Option D is incorrect because replaceAll() is the method used to clear the current text and add new content.

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