message dialog error

I get this error:

cannot find symbol
symbol: method showMessageDialog(<anonymous javax.swing.AbstractAction>,java.lang.String,java.lang.String,int)

Can someone help me? Thanks

 exitAction = new
 AbstractAction("Esci") {

             public void actionPerformed(ActionEvent e) {

             if (rcStatus ==1) {

  开发者_JAVA百科  JOptionPane.showMessageDialog(this,
 "Thread running. Choose STOP before
 exit",
                     "Error", JOptionPane.ERROR_MESSAGE);


         }
          else {

                 System.exit(0);}

             }
         };
         exitAction.putValue(Action.NAME,
         "Exit");

         exitAction.putValue(Action.SHORT_DESCRIPTION,"Close");

---

There is no method in JOptionPane with that signature. Are you sure that the this you're passing in is an AbstractAction, which is not a Component. For showMessageDialog(), these are your options.

I think you want JOptionPane.showMessageDialog(Component parentComponent, Object message, String title, int messageType). If you don't have a suitable parent component to pass in, pass null instead of this:

JOptionPane.showMessageDialog(null, "Thread running. Choose STOP before exit", "Error", JOptionPane.ERROR_MESSAGE);

---

In your method call, this refers to the anonymous class that you are creating (that extends AbstractAction).

If this code is inside of a Component, such as:

public class MyComponent extends JComponent {
...
(your code)

then you can change your method call to:

JOptionPane.showMessageDialog(MyComponent.this, "Thread running", ...

MyComponent.this refers to the outer class object.