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  • 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结

    张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结

    第二部分:实验部分

    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9章示例程序,测试程序并进行代码注释。

    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:

    运行下列程序,观察程序运行结果。

    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);    

       }

    }

    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;

    掌握GUI顶层窗口创建技术。

    测试程序1:

    package 测试程序1;

    import javax.swing.*;

    public class SimpleFrameTest

    {

       public static void main(String[] args)

       {

         JFrame  frame = new JFrame();

         frame.setBounds(0, 0,300, 200);//确定窗口的位置以及大小

         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         //关闭方法默认

         frame.setVisible(true);    //窗口可见

       }

    }

    测试结果:

     

    测试程序2:

    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。

    测试程序2:

    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);

       }

    }

    测试结果:

     

    测试程序3:

    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;

    l 掌握自定义组件的用法。

    测试程序3:

    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); }

    }

    测试结果:

     

    测试程序4:

    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;

    掌握2D图形的绘制方法。

    测试程序:

    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); }

    }

    测试结果:

     

    测试程序5:

    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;

    了解2D图形中字体的设置的方法;

    测试程序5:

    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); }

    }

    测试结果:

     

    测试程序6:

    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;

    了解2D图形图像的显示方法。

    测试程序SetDemo

    import java.util.*;

    public class SetDemo {

        public static void main(String[] argv) {

            HashSet h = new HashSet(); //也可以 Set h=new HashSet()

            h.add("One");

            h.add("Two");

            h.add("One"); // DUPLICATE

            h.add("Three");

            Iterator it = h.iterator();

            while (it.hasNext()) {

                 System.out.println(it.next());

            }

        }

    }

    测试结果:

     

    第三部分:实验总结:

         在这一周的学习中我第一次接触了怎样用Java编程来设计一个自己的窗口,虽然设计的窗口十分简洁,只能设计大小和插入基本文字图案,但也算在Java设计窗口方面开了一个好头。另外,在本周的测试中,我发现我对前几周学习的知识有所遗忘,好几道题目都是查找资料才做出来的,今后要加强对以前学习知识的巩固。

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  • 原文地址:https://www.cnblogs.com/Alex-Morcer/p/9978004.html
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