import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import javax.swing.JFrame;
public class CenterTextRectangle extends JFrame {
public static void main(String[] a) {
CenterTextRectangle f = new CenterTextRectangle();
f.setSize(300, 300);
f.setVisible(true);
}
final Font f = new Font("SansSerif", Font.BOLD, 18);
public void paint(Graphics g) {
Dimension d = this.getSize();
g.setColor(Color.white);
g.fillRect(0, 0, d.width, d.height);
g.setColor(Color.black);
g.setFont(f);
drawCenteredString("This is centered.", d.width, d.height, g);
g.drawRect(0, 0, d.width - 1, d.height - 1);
}
public void drawCenteredString(String s, int w, int h, Graphics g) {
FontMetrics fm = g.getFontMetrics();
int x = (w - fm.stringWidth(s)) / 2;
int y = (fm.getAscent() + (h - (fm.getAscent() + fm.getDescent())) / 2);
g.drawString(s, x, y);
}
}