Consider the scope of the three objects menuLabel, mi, and the anonymous object new MyMenuListener() within the JmenuItem class.How do thier lifetimes compare?
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)all have the same lifetimes
B)menuLabel and new MyMenuListener() are the same and both longer than mi
C)mi and new MyMenuListener() are the same and both longer than menuLabel
D)from shortest to longest:menuLabel, new MyMenuListener(), mi

Question

Quizplus · Accepted Answer

The lifetimes of menuLabel, mi, and the anonymous object new MyMenuListener() are all tied to the instance of JMenuItem returned by the makeMenuItem method. They all have the same lifetime as they are all used within the scope of the method and are associated with the JMenuItem object.

Consider the Scope of the Three Objects MenuLabel, Mi, and the Anonymous