JTextField textField = new JTextField("Enter text here"); Border currentBorder = textField.getBorder(); if (currentBorder != null) { currentBorder = BorderFactory.createLineBorder(Color.GREEN); textField.setBorder(currentBorder); }
JTextField textField = new JTextField("Enter text here"); Border currentBorder = textField.getBorder(); if (currentBorder == null) { System.out.println("Border is empty!"); }This code creates a new `JTextField` with the initial text "Enter text here". It gets the current border of the text field and checks if it is null. If there is no border set for the text field, it prints out "Border is empty!". In both examples, the package library used is `javax.swing`.