TextAreaEx.java

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import javax.swing.*;  
import java.awt.*;  
import java.awt.event.*;
 
public class TextAreaEx implements ActionListener {  
    JTextArea text;
    
    public static void main(String[] args) {  
        TextAreaEx gui = new TextAreaEx();  
        gui.go();
    }
 
    public void go() {
        JFrame frame = new JFrame();  
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        JButton button = new JButton("Just Click It");  
        button.addActionListener(this);
        text = new JTextArea(10, 20);  
        text.setLineWrap(true);
        JScrollPane scroller = new JScrollPane(text);  
        scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);  
        scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        panel.add(scroller);
        frame.add(panel, BorderLayout.CENTER);  
        frame.add(button, BorderLayout.SOUTH);
        frame.setSize(350, 300);  
        frame.setVisible(true);
    }
 
    public void actionPerformed(ActionEvent event) {  
        text.append("button clicked\n");
    }
}