How to use actionPerformed( ActionEvent e ) with more that one button?

Question

So my assignment says to create a sequential file. My professor gave me this simple code for the actionperformed:

    public void actionPerformed( ActionEvent e          


        

Answer 1

I found the solution, it was right in front of my eyes, here it is for future users.

public void actionPerformed(ActionEvent e){ 

  //FOR STATE AND COUNTRY
  String country = (String)comboBox_1.getSelectedItem();
  Object o = states.get(country);
  if (o == null){
      comboBox_2.setModel(new DefaultComboBoxModel());
  }
  else{
      comboBox_2.setModel(new DefaultComboBoxModel((String[])o));
  }
  //****DONE WITH THE STATE AND COUNTRY COMBOBOXES*****

  // this was the solution for my problem
  if(e.getSource==buttonToAddRecords){
      addRecord( ) ;
  }

  if(e.getSource( ) == btnDone){
    try{
      output.close( ); 
    }
    catch(IOException io){
      System.err.println("File not closed properly\n" +
         e.toString( ));
      System.exit(1);
    }
    System.exit(0); 
  }
}