1. 程式人生 > >張季躍 201771010139《面向對象程序設計(java)》第十二周學習總結

張季躍 201771010139《面向對象程序設計(java)》第十二周學習總結

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張季躍 201771010139《面向對象程序設計(java)》第十二周學習總結

第二部分:實驗部分

1、實驗目的與要求

(1) 掌握Java GUI中框架創建及屬性設置中常用類的API;

(2) 掌握Java GUI中2D圖形繪制常用類的API;

(3) 了解Java GUI中2D圖形中字體與顏色的設置方法;

(4) 了解Java GUI中2D圖像的載入方法。

2、實驗內容和步驟

實驗1: 導入第9章示例程序,測試程序並進行代碼註釋。

2、實驗內容和步驟

實驗1: 導入第10章示例程序,測試程序並進行代碼註釋。

測試程序1:

l 運行下列程序,觀察程序運行結果。

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);

}

}

l elipse IDE中調試運行教材407頁程序10-1,結合程序運行結果理解程序;與上面程序對比,思考異同;

l 掌握空框架創建方法;

l 了解主線程與事件分派線程概念;

l 掌握GUI頂層窗口創建技術。

測試程序1:

package 測試程序1;

import javax.swing.*;

public class SimpleFrameTest

{

public static void main(String[] args)

{

JFrame frame = new JFrame();

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

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE

);

//關閉方法默認

frame.setVisible(true); //窗口可見

}

}

測試結果:

技術分享圖片

測試程序2:

l elipse IDE中調試運行教材412頁程序10-2,結合程序運行結果理解程序;

l 掌握確定框架常用屬性的設置方法。

測試程序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);

}

}

測試結果:

技術分享圖片

測試程序3:

l elipse IDE中調試運行教材418頁程序10-3,結合運行結果理解程序;

l 掌握在框架中添加組件;

l 掌握自定義組件的用法。

測試程序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); }

}

測試結果:

技術分享圖片

測試程序4:

l elipse IDE中調試運行教材424 -425頁程序10-4,結合程序運行結果理解程序;

l 掌握2D圖形的繪制方法。

測試程序:

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); }

}

測試結果:

技術分享圖片

測試程序5:

l elipse IDE中調試運行教材432頁-433程序10-5,結合程序運行結果理解程序;

l 了解2D圖形中字體的設置的方法;

測試程序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); }

}

測試結果:

技術分享圖片

測試程序6:

l elipse IDE中調試運行教材436頁-437程序10-6,結合程序運行結果理解程序;

l 了解2D圖形圖像的顯示方法。

測試程序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());

}

}

}

測試結果:

技術分享圖片

第三部分:實驗總結:

在這一周的學習中我第一次接觸了怎樣用Java編程來設計一個自己的窗口,雖然設計的窗口十分簡潔,只能設計大小和插入基本文字圖案,但也算在Java設計窗口方面開了一個好頭。另外,在本周的測試中,我發現我對前幾周學習的知識有所遺忘,好幾道題目都是查找資料才做出來的,今後要加強對以前學習知識的鞏固。

張季躍 201771010139《面向對象程序設計(java)》第十二周學習總結