The code below will not compile successfully unless the argument to the makeMenuItem method is final.Why not?
public JMenuItem makeMenuItem(final String menuLabel)
{
JMenuItem mi = new JMenuItem(menuLabel);
class MyMenuListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
doSomethingElse();
System.out.println(menuLabel);
}
}
mi.addActionListener(new MyMenuListener());
return mi;
}
A)JMenuItem labels must be final
B)This prevents the menuLabel argument from being modified
C)Because a local variable is being accessed from an inner classes
D)Because the String class is final

Question

Quizplus · Accepted Answer

Inner classes, like the MyMenuListener class in this case, cannot access non-final local variables from their enclosing methods. Therefore, in order to access the menuLabel argument in the actionPerformed method, it must be declared final.

The Code Below Will Not Compile Successfully Unless the Argument