frame1.java

jbuilder2005

package ovaltest;

import java.awt.*;
import javax.swing.*;

public class Frame1
    extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();

  public Frame1() {
    try {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch (Exception exception) {
      exception.printStackTrace();
    }
  }

  /**
   * Component initialization.
   *
   * @throws java.lang.Exception
   */
  private void jbInit() throws Exception {
    contentPane = (JPanel) getContentPane();
    contentPane.setLayout(borderLayout1);
    setSize(new Dimension(300, 200));
    setTitle("绘制图形");
  }
  public void paint(Graphics g)
    {
      g.drawRect(20, 30, 150, 90);   //画空心矩形
      g.drawOval(20, 30, 150, 90);   //使用同样参数，画空心椭圆
      g.setColor(Color.BLUE);
      g.fillRect(190, 30, 90, 90);  //画蓝色实心矩形
      g.setColor(Color.cyan);
      g.fillOval(190, 30, 90, 90);  //画青色实心圆
    }

}