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宿題スレPart55 >>172 への回答　ゲーム †

	import java.awt.*;
	import java.awt.image.*;
	import java.awt.event.*;
	import javax.swing.*;
	    
	public class HW116 extends JApplet {
		private static final int[][] CONTEXT = {
				{ 5, 900},	
				{ 10, 800},	
				{ 15, 700},	
				{ 20, 600},	
		};
		private static final int SCREEN_W = 600;
		private static final int SCREEN_H = 500;
		private static final String IMG_NAME = "img1.png";
		
		private Game game;
		private int score;
		
		private JLabel screen = new JLabel();
		private JLabel status = new JLabel();
		private JButton startBtn = new JButton("スタート");
		private JButton stopBtn = new JButton("ストップ");	
		
		private BufferedImage scrImg = new BufferedImage(SCREEN_W, SCREEN_H,
				BufferedImage.TYPE_INT_ARGB);
		private Graphics2D scrG = scrImg.createGraphics();
		private Image image;
		private int imgW;
		private int imgH;
		
		
		public void init () {
			image = getImage(getCodeBase(), IMG_NAME);
			MediaTracker mt = new MediaTracker(this);
			mt.addImage(image, 0);
			while (mt.checkAll() == false) {
				try {
					mt.waitForAll();
				} catch (InterruptedException ex) {
					// nop
				}
			}
			imgW = image.getWidth(null);
			imgH = image.getHeight(null);
			
			scrG.setBackground(new Color(230, 230, 240));
			scrG.clearRect(0, 0, scrImg.getWidth(), scrImg.getHeight());
			
			screen.setIcon(new ImageIcon(scrImg));
			screen.setBorder(BorderFactory.createEtchedBorder());
			screen.setHorizontalAlignment(SwingConstants.CENTER);
			screen.setVerticalAlignment(SwingConstants.CENTER);
			screen.setHorizontalTextPosition(SwingConstants.CENTER);
			screen.setFont(new Font("Dialog", 1, 20));
			screen.addMouseListener(new MouseAdapter() {
				public void mousePressed (MouseEvent e) {
					if (game == null) {
						return;
					}
					if (game.getRect().contains(e.getPoint())) {
						status.setText("スコア：" + (++score) + "点");
						game.interrupt();
					}
				}
			});
			
			status.setHorizontalAlignment(SwingConstants.CENTER);
			status.setPreferredSize(new Dimension(1000, 32));
			status.setFont(new Font("Dialog", 1, 15));
			
			startBtn.addActionListener(new ActionListener () {
				public void actionPerformed (ActionEvent e) {
					screen.setText("");
					score = 0;
					status.setText("スコア：" + score + "点");
					
					startBtn.setEnabled(false);
					stopBtn.setEnabled(true);
					game = new Game();
					game.start();
				}
			});
			stopBtn.addActionListener(new ActionListener () {
				public void actionPerformed (ActionEvent e) {
					game.setStopFlag();
					game = null;
					status.setText("中止しました");
					startBtn.setEnabled(true);
					stopBtn.setEnabled(false);
				}
			});
			stopBtn.setEnabled(false);
			JPanel bottom = new JPanel(new FlowLayout(FlowLayout.CENTER, 64, 4));
			bottom.add(startBtn);
			bottom.add(stopBtn);
			
			add(screen, BorderLayout.CENTER);
			add(bottom, BorderLayout.SOUTH);
			add(status, BorderLayout.NORTH);
		}
		
		private class Game extends Thread {
			private Rectangle rect = new Rectangle();
			private volatile boolean stopFlag;
			
			public void run () {
				for (int i = 0; i < CONTEXT.length; i++) {
					int count = CONTEXT[i][0];
					int interval = CONTEXT[i][1];
					
					for (int k = 0; k < count; k++) {
						if (stopFlag) {
							scrG.clearRect(0, 0, SCREEN_W, SCREEN_H);
							screen.repaint();
							return;
						}
						int x = (int) (Math.random() * (SCREEN_W - imgW));
						int y = (int) (Math.random() * (SCREEN_H - imgH));
						setRect(x, y, imgW, imgH);	
						scrG.drawImage(image, x, y, null);
						screen.repaint();
						
						try {
							Thread.sleep(interval);
						} catch (InterruptedException e) {
							// nop
						}
						
						setRect(0, 0, 0, 0);	
						scrG.clearRect(x, y, imgW, imgH);
						screen.repaint();
					}
				}
				
				screen.setText("<html> ゲーム終了 <br> スコア" + score + "点 </html>");
				status.setText("");
				startBtn.setEnabled(true);
				stopBtn.setEnabled(false);
			}
			
			private synchronized void setRect (int x, int y, int w, int h) {
				rect.setBounds(x, y, w, h);
			}
			
			private synchronized Rectangle getRect () {
				return rect;
			}
			
			private void setStopFlag () {
				stopFlag = true;
			}
		}
	}

宿題スレPart55 >>168 への回答　JavaMLの解析 †

	import java.io.*;
	import java.util.*;
	import java.util.Map.Entry;
	import javax.xml.parsers.*;
	import org.w3c.dom.*;
	
	public class HW114 {
		private static final Map keyToText = new HashMap() {
			{
				put("root_type", "ソースファイル");
				put("class_type", "クラス名");
				put("method_type", "メソッド名");
				put("class_count", "クラスの数");
				put("method_count", "メソッドの数");
				put("field_count", "属性の数");
				put("public", "publicメンバの数");
				put("protected", "protectedメンバの数");
				put("package", "packageメンバの数");
				put("private", "privateメンバの数");
				put("line_count", "ステートメントの数");
				put("call_count", "メソッド呼出の回数");
			}
		};
		private static final Set modifySet = new TreeSet(
				Arrays.asList(new String[] { "public", "protected", "package", "private" }));
		
		
		public static void main (String[] args) {
			Document doc = null;
			try {
				if (args.length == 0) {
					throw new Exception();
				}
				DocumentBuilder db = DocumentBuilderFactory.newInstance()
				.newDocumentBuilder();
				doc = db.parse(new File(args[0]));
			} catch (Exception ex) {
				System.out.println("ＸＭＬファイル読み込みエラー");
				System.exit(0);
			}
			
			Map rootMap = new LinkedHashMap();
			rootMap.put("type", "root_type");
			rootMap.put("name", "");
			Element root = doc.getDocumentElement();
			inspect(root, rootMap);
			
			StringBuffer sb = new StringBuffer();
			output(sb, rootMap, "");
			
			try {
				File file = new File("output.txt");
				FileWriter fw = new FileWriter(file);
				BufferedWriter bw = new BufferedWriter(fw);
				bw.write(sb.toString());
				bw.flush();
				bw.close();
			} catch (Exception ex) {
				System.out.println("書き込みエラー");
			}
		}
		
		private static void inspect (Node elm, Map param) {
			NodeList list = elm.getChildNodes();
			
			for (int i = 0; i < list.getLength(); i++) {
				Node node = list.item(i);
				if (node.getNodeType() != Node.ELEMENT_NODE) {
					continue;
				}
				
				if (node.getNodeName().equals("class")) {
					processClass(node, param);
				} else if (node.getNodeName().equals("method")) {
					processMember(node, param, true);
				} else if (node.getNodeName().equals("field")) {
					processMember(node, param, false);
				} else if (node.getNodeName().equals("block")) {
					processLine(node, param, true);
				} else if (node.getNodeName().equals("send")) {
					processLine(node, param, false);
				} else if (node.getNodeName().equals("modifier")) {
					processModifier(node, param);
				} else {
					inspect(node, param);
				}
			}
		}
		
		private static void processClass (Node node, Map map) {
			if (map.get("type").equals("root_type") == false) {
				return;
			}
			
			Integer itg = (Integer) map.get("class_count");
			if (itg == null) {
				itg = new Integer(0);
			}
			map.put("class_count", new Integer(itg.intValue() + 1));
			
			NamedNodeMap attrs = node.getAttributes();
			Attr att = (Attr) attrs.getNamedItem("name");
			String className = att.getValue();
			
			Map newMap = new LinkedHashMap();
			newMap.put("type", "class_type");
			newMap.put("name", className);
			newMap.put("parent", map);
			map.put("child@" + className, newMap);
			
			inspect(node, newMap);
		}
		
		private static void processMember (Node node, Map map, boolean isMethod) {
			if (map.get("type").equals("class_type") == false) {
				return;
			}
			
			String countName = (isMethod) ? "method_count" : "field_count";
			Integer itg = (Integer) map.get(countName);
			if (itg == null) {
				itg = new Integer(0);
			}
			map.put(countName, new Integer(itg.intValue() + 1));
			
			if (isMethod) {
				NamedNodeMap attrs = node.getAttributes();
				Attr att = (Attr) attrs.getNamedItem("name");
				String metName = att.getValue();
				
				Map newMap = new LinkedHashMap();
				newMap.put("type", "method_type");
				newMap.put("name", metName);
				newMap.put("parent", map);
				map.put("child@" + metName, newMap);
				
				inspect(node, newMap);
			}
		}
		
		private static void processLine (Node node, Map map, boolean isBlock) {
			if (map.get("type").equals("method_type") == false) {
				return;
			}
			
			String countName = (isBlock) ? "line_count" : "call_count";
			Integer itg = (Integer) map.get(countName);
			if (itg == null) {
				itg = new Integer(0);
			}
			map.put(countName, new Integer(itg.intValue() + 1));
			
			if (isBlock) {
				inspect(node, map);
			}
		}
		
		private static void processModifier (Node node, Map map) {
			if (map.get("type").equals("method_type") == false) {
				return;
			}
			
			NamedNodeMap attrs = node.getAttributes();
			Attr att = (Attr) attrs.getNamedItem("name");
			if (att == null
					|| modifySet.contains(att.getValue()) == false)
			{
				return;
			}
			String visName = att.getValue();
			
			Map parentMap = (Map) map.get("parent"); 
			Integer itg = (Integer) parentMap.get(visName);
			if (itg == null) {
				itg = new Integer(0);
			}
			parentMap.put(visName, new Integer(itg.intValue() + 1));
		}
		
		private static void output (StringBuffer sb, Map map, String tab) {
			List childList = new ArrayList();
			String newTab = tab + "    ";
			
			for (Iterator it = map.entrySet().iterator(); it.hasNext(); ) {
				Entry entry = (Entry) it.next();
				String name = (String) entry.getKey();
				Object value = entry.getValue();
				if (name.startsWith("child@")) {
					childList.add(value);
					continue;
				}
				if (name.equals("parent")) {
					continue;
				}
				
				Object text = keyToText.get(name);
				name = (text != null) ? (String) text : name;
				text = keyToText.get(value);
				value = (text != null) ? (String) text : value;
				
				if (name.equals("type")) {
					sb.append("\n" + tab + value + ":");
				} else if (name.equals("name")) {
					sb.append(value + "\n");
				} else {
					sb.append(newTab + name + ":" + value + "\n");
				}
			}
			
			for (int i = 0; i < childList.size(); i++) {
				output(sb, (Map) childList.get(i), newTab);
			}
		}
	}

宿題スレPart55 >>149 への回答　ＪＳＰ †

web.xmlファイル

<?xml version="1.0" encoding="Shift_JIS" ?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	version="2.4" >
	<welcome-file-list>
		<welcome-file> /WEB-INF/jsp/start.jsp </welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name> Start </servlet-name>
		<jsp-file> /WEB-INF/jsp/start.jsp </jsp-file>
	</servlet>
	<servlet-mapping>
		<servlet-name> Start </servlet-name>
		<url-pattern> /start </url-pattern>
	</servlet-mapping>
	<servlet>
		<servlet-name> TableList </servlet-name>
		<jsp-file> /WEB-INF/jsp/tablelist.jsp </jsp-file>
	</servlet>
	<servlet-mapping>
		<servlet-name> TableList </servlet-name>
		<url-pattern> /tablelist </url-pattern>
	</servlet-mapping>
	<servlet>
		<servlet-name> Table </servlet-name>
		<jsp-file> /WEB-INF/jsp/table.jsp </jsp-file>
	</servlet>
	<servlet-mapping>
		<servlet-name> Table </servlet-name>
		<url-pattern> /table </url-pattern>
	</servlet-mapping>
</web-app>

start.jspファイル

<%@page contentType="text/html; charset=Shift_JIS" pageEncoding="Shift_JIS" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<head>
	<meta http-equiv="content-type" content="text/html; charset="Shift_JIS" >
</head>
<body>
	<c:if test = "${datasrc == null}">
		<sql:setDataSource url="jdbc:mysql://localhost:3306/homework" driver="com.mysql.jdbc.Driver"
			user="root" password="root" var="datasrc" scope="application" />
	</c:if>
	<form action="tablelist" method="GET">
	<table align="center" border="1">
		<tr>
			<td colspan="2" align="center"> ユーザー認証 </td>
		</tr>
		<tr>
			<td> 名前 </td>
			<td> <input type="text" maxlength="10" name="username"> </td>
		</tr>
		<tr>
			<td> パスワード </td>
			<td> <input type="password" maxlength="10" name="password"> </td>
		</tr>
		<tr>
			<td colspan="2" align="center"> <input type="submit" value="select"> </td>
		</tr>
	</table>
	</form>
</body>

tablelist.jspファイル

<%@page contentType="text/html; charset=Shift_JIS" pageEncoding="Shift_JIS" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<head>
	<meta http-equiv="content-type" content="text/html; charset="Shift_JIS" >
</head>
<body>
	<sql:query var="rowset" dataSource="${datasrc}">
		show tables;
	</sql:query>
	<center> テーブル一覧 </center>
	<br>
	<table align="center" border="1" cellpadding="4">
		<c:forEach var="row" items="${rowset.rows}">
			<tr>
				<td> ${row.Tables_in_homework} </td>
				<td> 
					<form action="table" method="GET">
						<input type="hidden" name="table" value="${row.Tables_in_homework}" />
						<input type="submit" value="select" /> 
					</form>
				</td>			
			</tr>
		</c:forEach>
	</table>
	<br>
	<center>
	<form action="start" method="GET">
		<input type="submit" value="back">
	</form>
	</center>
</body>

table.jspファイル

<%@page contentType="text/html; charset=Shift_JIS" pageEncoding="Shift_JIS" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<head>
	<meta http-equiv="content-type" content="text/html; charset="Shift_JIS" >
</head>
<body>
	<sql:query var="rowset" dataSource="${datasrc}">
		select * from ${param.table} ;
	</sql:query>
	<center> ${param.table} </center>	
	<br>
	<table align="center" border="1" cellpadding="8">
		<tr>
			<td align="center"> No </td>
			<td align="center"> Name </td>
			<td align="center"> Money </td>
		</tr>
		<c:forEach var="row" items="${rowset.rows}">
			<tr>
				<td> ${row.No} </td>
				<td> ${row.Name} </td>
				<td> ${row.Money} </td>
			</tr>
		</c:forEach>
	</table>
	<br>
	<center>
	<form action="tablelist" method="GET">
		<input type="submit" value="back">
	</form>
	</center>
</body>

宿題スレPart55 >>121-122 への回答　棒グラフ †

   // GraphDemo.java
   import java.applet.Applet;
   import java.awt.Color;
   import java.awt.Graphics;
   import java.util.Iterator;
   import java.util.LinkedHashMap;
   import java.util.Set;
   
   /*
    *<applet code="GraphDemo.class" width="900" height="200">aaa</applet>
    */
   public class GraphDemo extends Applet {
   
       public static final String COMPANY_A = "A社";
       public static final String COMPANY_B = "B社";
       public static final String COMPANY_C = "C社";
       public static final String COMPANY_D = "D社";
       
       public static final String TERM_NEW     = "新人";
       public static final String TERM_FRESH   = "若手";
       public static final String TERM_MID     = "中堅";
       public static final String TERM_VETERAN = "ベテラン";
       
       public static final String SEX_MAN   = "男";
       public static final String SEX_WOMAN = "女";
       
       private LinkedHashMap<Data, Integer> distribution = new LinkedHashMap<Data, Integer>();
       
       public void init() {
           distribution.put( new Data(COMPANY_A, TERM_NEW, false),  95 );
           distribution.put( new Data(COMPANY_A, TERM_NEW, true),  10 );
           distribution.put( new Data(COMPANY_A, TERM_FRESH, false),    85 );
           distribution.put( new Data(COMPANY_A, TERM_FRESH, true),  10 );
           distribution.put( new Data(COMPANY_A, TERM_MID, false),    98 );
           distribution.put( new Data(COMPANY_A, TERM_MID, true),   8 );
           distribution.put( new Data(COMPANY_A, TERM_VETERAN, false),    77 );
           distribution.put( new Data(COMPANY_A, TERM_VETERAN, true),   6 );
   
           distribution.put( new Data(COMPANY_B, TERM_NEW, false),  56 );
           distribution.put( new Data(COMPANY_B, TERM_NEW, true),  16 );
           distribution.put( new Data(COMPANY_B, TERM_FRESH, false),    44 );
           distribution.put( new Data(COMPANY_B, TERM_FRESH, true),  19 );
           distribution.put( new Data(COMPANY_B, TERM_MID, false),    66 );
           distribution.put( new Data(COMPANY_B, TERM_MID, true),   25 );
           distribution.put( new Data(COMPANY_B, TERM_VETERAN, false),    86 );
           distribution.put( new Data(COMPANY_B, TERM_VETERAN, true),  24 );
           
           distribution.put( new Data(COMPANY_C, TERM_NEW, false),  28 );
           distribution.put( new Data(COMPANY_C, TERM_NEW, true),  13 );
           distribution.put( new Data(COMPANY_C, TERM_FRESH, false),    31 );
           distribution.put( new Data(COMPANY_C, TERM_FRESH, true),  18 );
           distribution.put( new Data(COMPANY_C, TERM_MID, false),    25 );
           distribution.put( new Data(COMPANY_C, TERM_MID, true),  16 );
           distribution.put( new Data(COMPANY_C, TERM_VETERAN, false),    0 );
           distribution.put( new Data(COMPANY_C, TERM_VETERAN, true),   0 );
   
           distribution.put( new Data(COMPANY_D, TERM_NEW, false),  105 );
           distribution.put( new Data(COMPANY_D, TERM_NEW, true),  13 );
           distribution.put( new Data(COMPANY_D, TERM_FRESH, false),    73 );
           distribution.put( new Data(COMPANY_D, TERM_FRESH, true),  6 );
           distribution.put( new Data(COMPANY_D, TERM_MID, false),    141 );
           distribution.put( new Data(COMPANY_D, TERM_MID, true),   18 );
           distribution.put( new Data(COMPANY_D, TERM_VETERAN, false),   0 );
           distribution.put( new Data(COMPANY_D, TERM_VETERAN, true),   0 );
       }
       
       public void paint( Graphics g ) {
           // 各社のx座標
           int xA = 30, xB = 30, xC = 30, xD = 30;
           // 各社のy座標
           int yA = 20, yB = 70, yC = 120, yD = 170;
           // タイトル部分に会社名を書く。
           g.drawString( COMPANY_A, 10, yA+10 );
           g.drawString( COMPANY_B, 10, yB+10 );
           g.drawString( COMPANY_C, 10, yC+10 );
           g.drawString( COMPANY_D, 10, yD+10 );
           // HashMapのkeyを全部とってIteratorでまわす。
           Set keySet = distribution.keySet();
           Iterator iterator = keySet.iterator();
           while( iterator.hasNext() ) {
               Data key = (Data)iterator.next();
               // 棒グラフの開始地点座標
               int y = 0;
               int x = 0;
               // 棒の長さは人数に比例(比例定数は2にしてみた。)
               int width = distribution.get(key) * 2;
               // keyから会社名を取得。
               String keyCompany = key.getCompanyName();
               // 会社が違えば、y座標が異なる。
               // x座標は棒を書いた最右端になるようにする。
               if( keyCompany.equals( COMPANY_A ) ) {
                   y = yA; x = xA; xA += width;
               } else if( keyCompany.equals( COMPANY_B ) ) {
                   y = yB; x = xB; xB += width;
               } else if( keyCompany.equals( COMPANY_C ) ) {
                   y = yC; x = xC; xC += width;
               } else {
                   y = yD; x = xD; xD += width;
               }
               // 性別が違えば、色が異なる。
               String keySex = key.getSex();
               if( keySex.equals( SEX_MAN ) ) g.setColor( Color.BLUE );
               else g.setColor( Color.RED );
               // 棒を書く。
               g.drawRect( x, y, width, 10 );
               // 黒字でキャリアを書いておく。
               g.setColor( Color.BLACK );
               String keyTerm = key.getTerm();
               if(width != 0) {
                   g.drawString( keyTerm, (x + width/2 -keyTerm.length()*5), y );
                   g.drawString( "" + (width/2), (x + width/2 -5), y+10 );
               }
           }
       }
   }
   // Data.java
   public class Data {
       private String companyName;
       private String term;
       private boolean isFemale;
       
       public Data( String companyName, String term, boolean isFemale ) {
           this.companyName = companyName;
           this.term = term;
           this.isFemale = isFemale;
       }
   
       public String getCompanyName() {
           return companyName;
       }
   
       public boolean isFemale() {
           return isFemale;
       }
   
       public String getTerm() {
           return term;
       }
       
       public String toString() {
           return this.companyName + this.term + getSex();
       }
       
       public String getSex() {
           return this.isFemale ? GraphDemo.SEX_WOMAN : GraphDemo.SEX_MAN;
       }
   }

宿題スレPart54 >>956-957 への回答　ひらがなカウンター †

   // HiraganaCounter.java
   import java.io.FileReader;
   import java.io.IOException;
   
   public class HiraganaCounter {
       public static void main(String[] args) {
           FileReader fr = null;
           try {
               fr = new FileReader(args[0]);
               int[] letter = new int[83];// ぁ〜ん までの83個を作成
               for( int c; (c=fr.read()) != -1; ) {
                   if (12353 <= c && c <= 12435 ) {
                       letter[c - 12353]++;
                   }
               }
               for( int i=0; i<letter.length; i++ ) {
                   System.out.println( (char)(i+12353) + ":" + letter[i] );
               }
           } catch (IOException ioe) {
               ioe.printStackTrace();
           } finally {
               try {
                   if( fr != null ) fr.close();
               } catch( IOException ioe ) {}
           }
       }
   }
written by iys

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