第十二周作业
本人学号：201771010138
姓名：邹丰蔚
《面向对象程序设计（java）》第十二周学习总结
1、实验目的与要求
(1) 掌握Java GUI中框架创建及属性设置中常用类的API；
(2) 掌握Java GUI中2D图形绘制常用类的API；
(3) 了解Java GUI中2D图形中字体与颜色的设置方法；
(4) 了解Java GUI中2D图像的载入方法。
2、实验内容和步骤
实验1： 导入第10章示例程序，测试程序并进行代码注释。
测试程序1：
l 运行下列程序，观察程序运行结果。
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import javax.swing.*; public class SimpleFrameTest { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setBounds(0, 0,300, 200); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } |
得出结果：
l 在elipse IDE中调试运行教材407页程序10-1，结合程序运行结果理解程序；与上面程序对比，思考异同；
l 掌握空框架创建方法；
l 了解主线程与事件分派线程概念；
l 掌握GUI顶层窗口创建技术。
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simpleFrame: 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); } }
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得出结果：
测试程序2：
l 在elipse IDE中调试运行教材412页程序10-2，结合程序运行结果理解程序；
l 掌握确定框架常用属性的设置方法。
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sizedFrame: 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(() -> { 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); } }
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得出结果：
测试程序3：
l 在elipse IDE中调试运行教材418页程序10-3，结合运行结果理解程序；
l 掌握在框架中添加组件；
掌握自定义组件的用法。
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notHelloWorld: 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); } }
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得出结果：
测试程序4：
l 在elipse IDE中调试运行教材424 -425页程序10-4，结合程序运行结果理解程序；
l 掌握2D图形的绘制方法。
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Draw: 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); } }
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得出结果：
测试程序5：
l 在elipse IDE中调试运行教材432页-433程序10-5，结合程序运行结果理解程序；
l 了解2D图形中字体的设置的方法；
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Font: 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); } } |
得出结果：
测试程序6：
l 在elipse IDE中调试运行教材436页-437程序10-6，结合程序运行结果理解程序；
l 了解2D图形图像的显示方法。
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Image: 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 = 300; private static final int DEFAULT_HEIGHT = 200;
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); } } |
得出结果：
实验2：课后完成PTA平台题目集：2018秋季西北师范大学面向对象程序设计（Java）练习题集（ch6-ch9)
总结：掌握了Java GUI中框架创建及属性设置中常用类的API、Java GUI中2D图形绘制常用类的API； 了解了Java GUI中2D图形中字体与颜色的设置方法以及Java GUI中2D图像的载入方法。感觉这是创建页面必不可少的一环。
