Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;

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

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(new TestPane());
        frame.pack();
        frame.setVisible(true);
        System.out.println("Frame size = " + frame.getSize());
    }
}

class TestPane extends JPanel {
    @Override
    public Dimension getPreferredSize() {
        return new Dimension(200, 200);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        String text = getWidth() + "x" + getHeight();
        FontMetrics fm = g2d.getFontMetrics();
        int x = (getWidth() - fm.stringWidth(text)) / 2;
        int y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();
        g2d.drawString(text, x, y);
        g2d.dispose();
    }
}