java - Can't get a Message Dialog box to come from an Action Listener -


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I I am receiving an error message as a result of an action listener in my program that receives an error that can not be changed to 'incompatible source code-incompatible type: zero to java.lang.String'. I can not understand what I am doing, especially when I can get input dialog and confirm the dialog box as I want the message dialog box, using a lot of code. Here is the code I used ... 

  // Search menu item srch.addActionListener (New ActionListener) {@Override Public Null ActionPerformed (ActionEvent e) {if (Database_Name =) Adding an ActionListener else if (Database_Name = null) {jta.setText ("this works");}; = null) {error = JOptionPane.showMessageDialog (zero, "error", JOptionPane.ERROR_MESSAGE) "This is an error Message? "}! // end if statement} // end actionPerformed}); // Find the end MENUITEM action listener

The error says just as, Error variable is most likely a string while does not return a value as 

   Code> (if database_name == null) {JOptionPane.showMessageDialog (null, "This is an error message", "Error", Joppanpan. ARROOS_OSSS); }

Will work fine.


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