frame1.java

jbuilder2005

package polygontest;

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("绘制多边形");
  }
  public void paint(Graphics g)
    {
        int[] x1={70,10,40,100,130};
        int[] x2={220,160,190,250,280};
        int[] y={50,90,150,150,90};   //两个图形的y坐标相同
        g.drawPolygon(x1,y,x1.length);    //空心
        g.fillPolygon(x2,y,x2.length);    //实心
    }

}