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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第1张图片

 

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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第2张图片

 

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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第3张图片

 

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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第4张图片

 

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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第5张图片

 

 

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:

 张季跃 201771010139《面向对象程序设计(java)》第十二周学习总结_第6张图片

 

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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