画笔

画笔

• public class Demo05 {
      public static void main(String[] args) {
          new MyPaint().loadFrame();
      }
  }
  class MyPaint extends Frame{
      public void loadFrame(){
          setBounds(200,200,600,500);
          setVisible(true);
          addWindowListener(new WindowAdapter() {
              @Override
              public void windowClosing(WindowEvent e) {
                  System.exit(0);
              }
          });
      }
      @Override    //ctrl + INS
      public void paint(Graphics g) {
          //super.paint(g);
          //画笔需要有颜色
          g.setColor(Color.cyan);
          //g.drawOval(100,100,100,100);  //空心的圆
          g.fillOval(100,100,100,100);  //实心的圆
          g.setColor(Color.BLUE);
          g.fillRect(150,200,200,200);
  
          //养成习惯，画笔用完，还原最初颜色
          g.setColor(Color.BLACK);
      }
  }