JavaでPNG画像を描く

ちょいとテスト．黄色い線が一本引かれるだけ．→な感じ．

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;

public class PNGWriter {
	public static void main(String[] args) {
		PNGWriter write = new PNGWriter();
		write.process();
	}

	private void process() {
		BufferedImage img = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
		Graphics2D g = img.createGraphics();
		drawFigs(g);
		try {
			ImageIO.write(img, "png", new File("test.png"));
		} catch (IOException e) {
			e.printStackTrace();
			System.err.print("File Output Error");
		}
		
	}

	private void drawFigs(Graphics2D g) {
		g.setPaint(Color.yellow);
		g.drawLine(10, 10, 90, 80);
	}
}