JPanelで描画処理 | Codetter（こーどったー）

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import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Sample {
    public static void main(String[] args) {
        JPanel panel = new JPanel() {
            @Override
            public void paintComponent(Graphics g) {
                /* paintComponent内に描画処理 */
                g.drawLine(40, 20, 20, 80);
                g.drawLine(20, 80, 80, 80);
                g.drawLine(80, 80, 40, 20);
            }
        };
        JFrame frame = new JFrame();
        frame.getContentPane().add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBounds(20, 20, 100, 120);
        frame.setVisible(true);
    }
}
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