GUI ComboBox Opens Other GUIs

[MiziaQ]

Hey, I have a problem which I need to resolve for my project. I want to open a different GUI class based on the selection made from a combobox:

 public void actionPerformed(ActionEvent event) { 
         JComboBox comboBox = (JComboBox)event.getSource(); 
         String selection = (String)comboBox.getSelectedItem(); 
         if (selection == "Price Elasticity of Demand") { 
            runGUI 
         }

How can I do this in java ?
Furthermore, how can i call a method from a different class when a button is clicked ?

Cheers in advance ;)

[Nepomuk]

 public void actionPerformed(ActionEvent event) { 
         JComboBox comboBox = (JComboBox)event.getSource(); 
         String selection = (String)comboBox.getSelectedItem(); 
         if (selection == "Price Elasticity of Demand") { 
            runGUI 
         }

First of all, you don't compare Strings like that in Java. Try

selection.equals("Price Elasticity of Demand")

instead.

Then, your idea seems to be good: use if's and elses. So for example:

String selection = (String)comboBox.getSelectedItem(); 
if (selection.equals("First option")) { 
   runGUI1();
} else if (selection.equals("Second option")) { 
  runGUI2();
} else if (selection.equals("Third option")) { 
  runGUI3();
} // etc.

Greetings,
Nepomuk