import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GreeterGUIPanel extends JPanel implements ActionListener {
    private JTextArea display;
    private JTextField inField;
    private JButton goButton;
    private Greeter greeter;
	    
    public GreeterGUIPanel() {
        greeter = new Greeter();  
    	buildGUI();
    }
        
    private void buildGUI() {
        display = new JTextArea(10,30);
        inField = new JTextField(10);
        inField.addActionListener(this);
        goButton = new JButton("Click here for a greeting!");
        goButton.addActionListener(this);
        JPanel inputPanel = new JPanel();
        inputPanel.add(new JLabel("Input your name here: "));
        inputPanel.add(inField);
        inputPanel.add(goButton);
        add("Center", display);
        add("South", inputPanel);
    }
    
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == goButton || e.getSource() == inField) {
            String name = inField.getText();
            display.append(greeter.greet(name) + "\n");
        }
    }
}