Which of the following corrects defines a ButtonListener as an inner class and c
ID: 3847567 • Letter: W
Question
Which of the following corrects defines a ButtonListener as an inner class and creates an instance of ButtonListener as a listener for the button? class ButtonListener implements ActionListener { public void actionPerformed (AnEvent event) { System.out.println("Button clicked"); } } button.addActionListener (new ButtonListener ()); class ButtonListener implements ActionEvent { public void actionPerformed (ActionListener event) { System. out.println ("Button clicked"); } } ActionListener listener = new ButtonListener (); button.addActionListener (listener); class ButtonListener implements ActionListener { public void actionPerformed (ActionEvent event) { System.out.println ("Button clicked"); } } ActionListener listener = new ButtonListener (); listener.actionPerformed (event); class ButtonListener implements ActionListener { public void actionPerformed (ActionEvent event) { System.out.println ("Button clicked"); } } button. addActionListener(new ButtonListener ()); Using the given definition of the Measurable interface: public interface Measurable { double getMeasure(); } Consider the following code snippet, assuming that BankAccount has a getBalance method and implements the Measurable interface by providing an implementation for the getMeasure method: Measurable m = new BankAccount (); System.out.println(m.getBalance ()); Which of the following statements is true? The code does not compile because a variable of type Measurable does not have a getBalance method. The code compiles but generates an exception at run time because a Measurable object reference does not have a getBalance method. The code executes, displaying the balance of the bank account. The code does not compile because you cannot assign a BankAccount object to a variable of type Measurable. Which of the following is the correct class header for a MouseclickListener class that wants to take advantage of the do-nothing methods provided by the MouseAdapter class? class MouseClickListener implements MouseAdapter class MouseClickListener extends MouseAdapter interface MouseClickListener extends MouseAdapter class MouseClick Listener implements MouseListenerExplanation / Answer
(1) The answer is option (d)
class ButtonListener implements ActionListener{
public void actionPerformed(ActionEvent event)
{
System.out.println("Button Clicked");
}
}
button.addActionListener(new ButtonListener());
(2) The answer is option (a)
The code does not compile because a variable of type Measurable does not have a getBalance method
(3) The answer is:
class MouseClickListener extends MouseAdapter
This is because, both MouseClickListener and MouseAdapter are classes. And one class can only be extended from the other class, but not implemented.