徐思201771010132《面向对象程序设计（java）》第十二周学习总结(代码片段)

import javax.swing.*;
public class SimpleFrameTest

   public static void main(String[] args)
   
     JFrame  frame = new JFrame(); 
     frame.setBounds(0, 0,300, 200);//设置窗口的位置，长宽
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置用户在此窗体上发起 "close" 时默认执行的操作
     frame.setVisible(true);//设置窗口是否可见    
   

package simpleFrame;

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);
    

package sizedFrame;

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(() -> // lambda表达式
        
            JFrame frame = new SizedFrame();
            frame.setTitle("SizedFrame");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 设置用户在此窗体上发起 "close" 时默认执行的操作
            frame.setVisible(true);// 设置窗口可见
        );
    


class SizedFrame extends JFrame 
    public SizedFrame() 
        // get screen dimensions

        Toolkit kit = Toolkit.getDefaultToolkit();// 生成Toolkit对象
        Dimension screenSize = kit.getScreenSize();// 返回Dimension对象的屏幕大小
        int screenHeight = screenSize.height;// 获得Dimension对象屏幕的高度
        int screenWidth = screenSize.width;// 获得Dimension对象屏幕的宽度

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

        setSize(screenWidth / 2, screenHeight / 2);// 调整组件的大小
        setLocationByPlatform(true);// 设置窗口下次可见时应该出现的位置

        // set frame icon

        Image img = new ImageIcon("icon.gif").getImage();
        setIconImage(img);// 设置要作为此窗口图标显示的图像
    

package notHelloWorld;

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

/**
 * @version 1.33 2015-05-12
 * @author Cay Horstmann
 */
public class NotHelloWorld 
    public static void main(String[] args) 
        EventQueue.invokeLater(() -> 
            JFrame frame = new NotHelloWorldFrame();
            frame.setTitle("NotHelloWorld");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        );
    


/**
 * A frame that contains a message panel
 */
class NotHelloWorldFrame extends JFrame 
    public NotHelloWorldFrame() 
        add(new NotHelloWorldComponent());
        pack();
    


/**
 * A component that displays a message.
 */
class NotHelloWorldComponent extends JComponent 
    public static final int MESSAGE_X = 75;
    public static final int MESSAGE_Y = 100;

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

    public void paintComponent(Graphics g) 
        g.drawString("Not a Hello, World program", MESSAGE_X, MESSAGE_Y);
    

    public Dimension getPreferredSize() 
        return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    

package draw;

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

/**
 * @version 1.33 2007-05-12
 * @author Cay Horstmann
 */
public class DrawTest 
    public static void main(String[] args) 
        EventQueue.invokeLater(() -> 
            JFrame frame = new DrawFrame();
            frame.setTitle("DrawTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        );
    


/**
 * A frame that contains a panel with drawings
 */
class DrawFrame extends JFrame 
    public DrawFrame() 
        add(new DrawComponent());
        pack();
    


/**
 * A component that displays rectangles and ellipses.
 */
class DrawComponent extends JComponent 
    private static final int DEFAULT_WIDTH = 400;
    private static final int DEFAULT_HEIGHT = 400;

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

        // draw a rectangle

        double leftX = 100;
        double topY = 100;
        double width = 200;
        double height = 150;

        Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);
        g2.draw(rect);

        // draw the enclosed ellipse

        Ellipse2D ellipse = new Ellipse2D.Double();
        ellipse.setFrame(rect);
        g2.draw(ellipse);

        // draw a diagonal line

        g2.draw(new Line2D.Double(leftX, topY, leftX + width, topY + height));

        // draw a circle with the same center

        double centerX = rect.getCenterX();
        double centerY = rect.getCenterY();
        double radius = 150;

        Ellipse2D circle = new Ellipse2D.Double();
        circle.setFrameFromCenter(centerX, centerY, centerX + radius, centerY + radius);
        g2.draw(circle);
    

    public Dimension getPreferredSize() 
        return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    

package font;

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);
    

package image;

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 = 350;
    private static final int DEFAULT_HEIGHT = 250;

    private Image image;

    public ImageComponent() 
        image = new ImageIcon("blue-ball.gif").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);