Question

public class X extends JFrame JLabel AL; JTextField ATF; JButton AB; ABButtonHandler aBButtonHandler; private class ABButtonHandler implements ActionListener public void actionPerformed (ActionEvent e) t public X) < setTitle("X Window") setSize (300,50); setDefaultClose0peration (EXIT_ON_CLOSE) Container XwindowPane = XWindowPane.setLayout( AL = ATF = AB XWindowPane.add (AL); XWindowPane.add (ATF); XWindowPane.add (AB); aBButtonHand ler setVisible(true) J; Complete the above code to create the window shown below X Window AB When the button AB is clicked the text field will end up with the concatenation its content to its own. For example, if the text field had the string ME before the click, it should have ME, ME after the click.

in java.

Answer 1

public class X extends JFrame{
    JLabel AL;
    JTextField ATF;
    JButton AB;
    ABButtonHandler aBButtonHandler;
    private class ABButtonHandler implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            ATF.setText(ATF.getText() + ATF.getText()); // concatenate the current text one more time on button press
        }
    }
    public X(){
        setTitle("X window");
        setSize(300, 50);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container XwindowPane = getContentPane(); //get Content Pane of the frame
        XwindowPane.setLayout(new FlowLayout());  // set Layout to new FLowLayout
        AL = new JLabel("A");       // Initialize the Label 
        ATF = new JTextField();     //Initialize the Text field
        AB = new JButton("AB");      // initialize the Button
        // add everthing to frame
        XwindowPane.add(AL);        
        XwindowPane.add(ATF);
        XwindowPane.add(AB);
        //initialize action handler of button and add it to button
        aBButtonHandler = new ABButtonHandler();
        AB.addActionListener(aBButtonHandler);
        setVisible(true);
    }

}