frame1.java

jbuilder2005

package recttest;

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("绘制矩形");
  }
  public void paint(Graphics g) {
    g.setColor(Color.green);    //绿色
    g.fillRect(20, 20, 100, 80); //画实心矩形，左上角坐标(20,20)，宽100、高80
    g.clearRect(40, 40, 60, 40);//清除矩形区域，左上角坐标(40,40)，宽60、高40
    g.setColor(Color.red);
    g.setClip(100, 20, 60, 60); //限定图形范围
    g.fillRect(120, 20, 100, 80);//画实心矩形
  }
}