绘图技术、事件监听 Java

1.绘图技术

JPanel

class MyPanle extends JPanel
{
public void paint(Graphics g)
{
super.paint(g);//必须要
g.drawOval(10, 10, 30, 10);
}
}

绘制图片/字符串

Image img = Toolkit.getDefaultToolkit().getImage(Panel.class.getResource("/caocao.jpg"));
g.drawImage(img,90,90,800,600,this);//this 为 jpanel

Image img = ImageIO.read(new File("1.gif"));

g.setFont(new Font("华文彩云", Font.BOLD, 30));
g.setColor(Color.red);
g.drawString(string, x, y);

2.事件监听

2.1包 java.awt.event

2.2

JButton.addActionListener(this)；
JButton.setActionCommand("黑色");

ActionListener
void actionPerformed
{
e.getCommand();
}