马凯军201771010116《面向对象与程序设计java》第十二周学习总结(代码片段)

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

/**
 * @version 1.33 2015-05-12
 * @author Cay Horstmann
 */
public class SimpleFrameTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            SimpleFrame frame = new SimpleFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
         );
   


class SimpleFrame extends JFrame

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   public SimpleFrame()
   
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
   

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

/**
 * @version 1.34 2015-06-16
 * @author Cay Horstmann
 */
public class SizedFrameTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new SizedFrame();
            frame.setTitle("SizedFrame");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
         );
   


class SizedFrame extends JFrame

   public SizedFrame()
   
      // get screen dimensions

      Toolkit kit = Toolkit.getDefaultToolkit();
      Dimension screenSize = kit.getScreenSize();
      int screenHeight = screenSize.height;
      int screenWidth = screenSize.width;

      // set frame width, height and let platform pick screen location

      setSize(screenWidth / 2, screenHeight / 2);
      setLocationByPlatform(true);

      // set frame icon

      Image img = new ImageIcon("icon.gif").getImage();
      setIconImage(img);      
   

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

/**
 * @version 1.34 2015-06-16
 * @author Cay Horstmann
 */
public class SizedFrameTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new SizedFrame();
            frame.setTitle("SizedFrame");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
         );
   


class SizedFrame extends JFrame

   public SizedFrame()
   
      // get screen dimensions

      Toolkit kit = Toolkit.getDefaultToolkit();
      Dimension screenSize = kit.getScreenSize();
      int screenHeight = screenSize.height;
      int screenWidth = screenSize.width;

      // set frame width, height and let platform pick screen location

      setSize(screenWidth / 2, screenHeight / 2);
      setLocationByPlatform(true);

      // set frame icon

      Image img = new ImageIcon("icon.gif").getImage();
      setIconImage(img);      
   

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

/**
 * @version 1.34 2015-05-12
 * @author Cay Horstmann
 */
public class FontTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new FontFrame();
            frame.setTitle("FontTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
         );
   


/**
 * A frame with a text message component
 */
class FontFrame extends JFrame

   public FontFrame()
         
      add(new FontComponent());
      pack();
   


/**
 * A component that shows a centered message in a box.
 */
class FontComponent extends JComponent

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   public void paintComponent(Graphics g)
   
      Graphics2D g2 = (Graphics2D) g;

      String message = "Hello, World!";

      Font f = new Font("Serif", Font.BOLD, 36);
      g2.setFont(f);

      // measure the size of the message

      FontRenderContext context = g2.getFontRenderContext();
      Rectangle2D bounds = f.getStringBounds(message, context);

      // set (x,y) = top left corner of text

      double x = (getWidth() - bounds.getWidth()) / 2;
      double y = (getHeight() - bounds.getHeight()) / 2;

      // add ascent to y to reach the baseline

      double ascent = -bounds.getY();
      double baseY = y + ascent;

      // draw the message

      g2.drawString(message, (int) x, (int) baseY);

      g2.setPaint(Color.LIGHT_GRAY);

      // draw the baseline

      g2.draw(new Line2D.Double(x, baseY, x + bounds.getWidth(), baseY));

      // draw the enclosing rectangle

      Rectangle2D rect = new Rectangle2D.Double(x, y, bounds.getWidth(), bounds.getHeight());
      g2.draw(rect);
   
   
   public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); 

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

/**
 * @version 1.34 2015-05-12
 * @author Cay Horstmann
 */
public class ImageTest

   public static void main(String[] args)
   
      EventQueue.invokeLater(() ->
         
            JFrame frame = new ImageFrame();
            frame.setTitle("ImageTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
         );
   


/**
 * A frame with an image component
 */
class ImageFrame extends JFrame

   public ImageFrame()
   
      add(new ImageComponent());
      pack();
   


/**
 * A component that displays a tiled image
 */
class ImageComponent extends JComponent

   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   private Image image;

   public ImageComponent()
   
      image = new ImageIcon("book.jpg.jpg").getImage();
   

   public void paintComponent(Graphics g)
   
      if (image == null) return;

      int imageWidth = image.getWidth(null);
      int imageHeight = image.getHeight(null);

      // draw the image in the upper-left corner

      g.drawImage(image, 0, 0, null);
      // tile the image across the component

      for (int i = 0; i * imageWidth <= getWidth(); i++)
         for (int j = 0; j * imageHeight <= getHeight(); j++)
            if (i + j > 0) 
               g.copyArea(0, 0, imageWidth, imageHeight, i * imageWidth, j * imageHeight);
   
   
   public Dimension getPreferredSize()  return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);