Exam 10: Graphical User Interfaces

Consider the following code snippet: JPanel panel = new JPanel(); JFrame frame = new JFrame(); JButton button = new JButton("Click me"); JLabel label = new JLabel("Show the answer"); Frame.add(label); Frame.add(button); Panel.add(frame); Which of the following statements is true?

Complete this code fragment to ensure that the application exits properly when the user closes the frame: JFrame frame = new JFrame();

Which of the following statements about events and graphical user interface programs is true?

Consider the following code snippet: Public static void main(String[] args) { Order myOrder = new Order(); JButton button = new JButton("Calculate"); JLabel label = new JLabel("Total amount due"); ) . . Class MyListener implements ActionListener { Public void actionPerformed(ActionEvent event) { Label.setText("Total amount due " + myOrder.getAmountDue()); } } } What is wrong with this code?

Consider the following code snippet: JPanel panel = new JPanel(); JFrame frame = new JFrame(); JLabel label = new JLabel("Show the answer"); JTextField field = new JTextField(5); Frame.add(label); Frame.add(field); Panel.add(frame); Which of the following statements is true?

Place drawing instructions inside the __________ method, which is called whenever the component needs to be repainted.

Which of the following is an event source?

Which of the following statements should be added to this code fragment to set the frame size to a width of 400 and a height of 200? Final int FRAME_WIDTH = 400; Final int FRAME_HEIGHT = 200; JFrame frame = new JFrame();

Event listeners are often installed as ____ classes so that they can have access to the surrounding fields, methods, and final variables.

Which container is used to group multiple user-interface components together?

What's the difference between a text field and a text area?

Which java package must be imported if a program wishes to respond to button events?

The Graphics class is part of the ____________________ package.

Consider the following code snippet: JFrame frame = new JFrame(); JPanel panel = new JPanel(); Which statement would add the panel to the frame?