Hi friend,

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

public class MainApp extends Frame {

MyTextArea textArea = new MyTextArea("");

public MainApp() {
setLayout(new BorderLayout());
Button button = new Button("Measure");
Button buttonExit = new Button("Exit");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int width = textArea.getWidth();
Graphics graphics = textArea.getGraphics();
FontMetrics fm = graphics.getFontMetrics();
System.out.println(fm.stringWidth(textArea.getText()));
System.out.println(width);
}
});
buttonExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.exit(0);
}
});

addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
System.exit(0);
}

public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

Panel panel = new Panel();
panel.add(button);
panel.add(buttonExit);

add(textArea, BorderLayout.CENTER);
add(panel, BorderLayout.SOUTH);
setSize(400,400);
setLocation(400,400);
setVisible(true);
}

public static void main (String args[]) {
new MainApp();
}

public class MyTextArea extends TextArea {
MyTextArea(String text) {
super(text, 0, 0, SCROLLBARS_NONE);
}
}
}

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Thanks