/** * Class ButtonEx5 is an example of a java gui program that uses another class to store data. * It uses the Cartesian class to store a pair of numbers. * Works when Cartesian Class is in same folder * * @author G. Greer modified M. Booth * @version 1.0 */ //import section import javax.swing.*; import java.awt.*; import java.awt.event.*; public class ButtonEx5 extends JFrame { //fields private Cartesian car;// cartesion object available to listeners private JTextField xTextField;// define a text field private JTextField yTextField; private JLabel aLabel; // define a label //constructor public ButtonEx5 () { //variables for gui and events JFrame aFrame; // define frame JButton button1;//define buttons JButton button2; JButton button3; ActionListener button1Listener; // define listeners ActionListener button2Listener; ActionListener button3Listener; car = new Cartesian(); //construct cartesian object // create, size and name the frame aFrame = new JFrame ("Button Example 5"); aFrame.setSize (400, 350); aFrame.setResizable(false); //cannot resize frame // set up frame to exit when it closes aFrame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); // create the label aLabel = new JLabel ("Output"); // create a text field xTextField = new JTextField ("0", 10); yTextField = new JTextField ("0", 10); // create buttons button1 = new JButton ("Save"); button2 = new JButton ("Retrieve"); button3 = new JButton ("Exit"); button1.setToolTipText ("Save the cartesian coordinates"); button2.setToolTipText ("Retrieve the cartesian coordinates"); button3.setToolTipText ("Exit the program"); // creating the action listeners button1Listener = new Button1Listener (); button2Listener = new Button2Listener (); button3Listener = new Button3Listener (); // connecting buttons to the action listeners button1.addActionListener (button1Listener); button2.addActionListener (button2Listener); button3.addActionListener (button3Listener); // add components to frame aFrame.getContentPane ().setLayout (new FlowLayout ()); aFrame.getContentPane ().add (xTextField);//add text aFrame.getContentPane ().add (yTextField); aFrame.getContentPane ().add (button1);//add buttons aFrame.getContentPane ().add (button2); aFrame.getContentPane ().add (button3); aFrame.getContentPane ().add (aLabel);//add label aFrame.setVisible (true); //make visible } // the inner classes that do the work //listen for activity at save button public class Button1Listener implements ActionListener { //when values are entered and button clicked public void actionPerformed (ActionEvent e) { try //make attempt to get values { int intX; //declare x and y variables int intY; //get x and y variables from textfield intX = Integer.valueOf (xTextField.getText ()).intValue (); intY = Integer.valueOf (yTextField.getText ()).intValue (); car.setX(intX);//save values as cartesian x, y values car.setY(intY); //display values saved in cartesian x, y aLabel.setText ("Saved ( " + Integer.toString (car.getX()) + " , " + Integer.toString (car.getY())+ " )"); } catch (Exception anError) //no value entered { aLabel.setText ( "Error: you must enter a number:" ); } } //end of action to get values from textfields } //end of save button listener //listen to retrieve button for activity public class Button2Listener implements ActionListener { //when there is action public void actionPerformed (ActionEvent e) { //display cartesian x, y values aLabel.setText ("Retrieved ( " + Integer.toString (car.getX()) + " , " + Integer.toString (car.getY())+ " )"); } } //end of retrieve button listener //listen to exit button public class Button3Listener implements ActionListener { //do this when exit button clicked public void actionPerformed (ActionEvent e) { System.exit (0); //exit } } //end exit button listener }