Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {

    public void paint(Graphics g) {
        int fontSize = 20;

        g.setFont(new Font("TimesRoman", Font.PLAIN, fontSize));

        FontMetrics fm = g.getFontMetrics();

        String s = "www.java2s.com";

        int stringWidth = fm.stringWidth(s);

        int w = 200;
        int h = 200;

        int x = (w - stringWidth) / 2;
        int baseline = fm.getMaxAscent() + (h - (fm.getAscent() + fm.getMaxDecent())) / 2;
        int ascent = fm.getMaxAscent();
        int descent = fm.getMaxDecent();
        int fontHeight = fm.getMaxAscent() + fm.getMaxDecent();

        g.setColor(Color.white);
        g.fillRect(x, baseline - ascent, stringWidth, fontHeight);

        g.setColor(Color.gray);
        g.drawLine(x, baseline, x + stringWidth, baseline);

        g.setColor(Color.red);
        g.drawLine(x, baseline + descent, x + stringWidth, baseline + descent);

        g.setColor(Color.blue);
        g.drawLine(x, baseline - ascent, x + stringWidth, baseline - ascent);
        g.setColor(Color.black);
        g.drawString(s, x, baseline);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().add(new Main());

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setVisible(true);
    }
}