Exam 10: Graphical User Interfaces

To associate an event listener with a JButton component, you must use the ___ method of the JButton class.

Which of the following statements about an inner class is true?

What happens if a text field's width is set to 10 characters and the user types more characters into it?

You have a class that extends the JComponent class. In this class you have created a painted graphical object. Your code will change the data in the graphical object. What additional code is needed to ensure that the graphical object will be updated with the changed data?

Which of the following statements will compile without error?

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

____ are generated when the user presses a key, clicks a button, or selects a menu item.

Which of the following statements about event listeners is true?

User-interface components are arranged by placing them inside ____________________.

Consider the following code snippet: Public static void main(String[] args) { Final Order myOrder = new Order(); JButton button = new JButton("Calculate"); Final JLabel label = new JLabel("Total amount due"); ) . . Class MyListener implements ActionListener { Public void actionPerformed(ActionEvent event) { ) . . } } } Which of the local variables can be accessed within the actionPerformed method?

Which statement should be added to this code fragment to ensure that the frame is shown? JFrame frame = new JFrame();

Which of the following statements is correct?

What is the nickname for the graphical user interface library in Java?

To draw an ellipse, you must include which of the following import statements?

Complete the following statement to construct a circle. Graphics g; g.____________________(x, y, width, height);

When added to the code below, which statement will set the color of the next item drawn to green? Public class ItalianFlagComponent extends JComponent { Public void paintComponent(Graphics g) { g.drawRect(100, 100, 30, 60); ) . . ____________________________ ) . . } }

When drawing complex shapes, provide a(n) ____ to set the position of the shape.

Use the ____ method to specify the height and width of a graphical component when you add it to a panel.

To build a user interface that contains multiple graphical components, the components ____.

A(n) ____ has an instance method addActionListener() for specifying which object is responsible for implementing the action associated with the object.