長留裕平のブログ - http://www.tyosuke20xx.com/

MySQL NULL

DROP TABLE IF EXISTS posts;
CREATE TABLE posts (
  id INT NOT NULL AUTO_INCREMENT,
  message VARCHAR(140),
  likes INT,
  PRIMARY KEY (id)
);

INSERT INTO posts (message, likes) VALUES
  ('Thanks', 12),
  ('Arigato', 4),
  ('Merci', NULL),
  ('Gracias', 15),
  ('Danke', NULL);

-- SELECT * FROM posts;
-- SELECT * FROM posts WHERE likes != 12;
-- SELECT * FROM posts WHERE likes != 12 OR likes IS NULL;
SELECT * FROM posts WHERE likes IS NOT NULL;

MySQL SELECT

DROP TABLE IF EXISTS posts;
CREATE TABLE posts (
  id INT NOT NULL AUTO_INCREMENT,
  message VARCHAR(140),
  likes INT,
  PRIMARY KEY (id)
);

INSERT INTO posts (message, likes) VALUES
  ('Thanks', 12),
  ('Arigato', 4),
  ('Merci', 4),
  ('Gracias', 15),
  ('Danke', 23);

-- SELECT * FROM posts;
-- SELECT id, message FROM posts;

-- > >= < <=
-- SELECT * FROM posts WHERE likes >= 10;

-- = != <>
SELECT * FROM posts WHERE message = 'Danke';
SELECT * FROM posts WHERE message != 'Danke';
SELECT * FROM posts WHERE message <> 'Danke';

Java break､continue

import java.util.Scanner;

public class MyApp {
  public static void main(String[] args) {
    int[] scores = {70, -10, 80, 90};
    for (int score: scores) {
      if (score < 0) {
        // break;
        continue;
      }
      System.out.println(score);
    }
    System.out.println("Finished");
  }
}

Java While

import java.util.Scanner;

public class MyApp {
  public static void main(String[] args) {
    String password;
    do {
      password = new Scanner(System.in).next();
    } while (password.equals("d0t1nsta11") == false);
    System.out.println("Password matched");
  }
}

Java 配列と反復処理

import java.util.Scanner;

public class MyApp {
  public static void main(String[] args) {
    int[] scores = {70, 90, 80, 60};
    // System.out.println(scores[0]);
    // System.out.println(scores[1]);
    // System.out.println(scores[2]);
    // for (int i = 0; i < 3; i++) {
    for (int i = 0; i < scores.length; i++) {
      System.out.println(scores[i]);
    }
  }

Java for

import java.util.Scanner;

public class MyApp {
  public static void main(String[] args) {
    for (int i = 0; i <= 10; i++){
      System.out.println(i + " Hello");
    }
  }
}

Bootstrapフッターを配置

<!doctype html>
<html lang="ja">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
    <title>My Site</title>
</head>

<body>
    <header class="bg-primary text-center text-light p-5">
        <h1 class="fs-3">My Admin</h1>
    </header>

    <div class="container mt-5">
        <section class="row">
            <section class="col-md-4 mb-5">
                こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。
            </section>
            <section class="col-md-8">
                こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。こんにちは。
            </section>
        </section>
    </div>

    <footer class="bg-secondary text-center text-light p-5 mt-5">
        (c) chodomeyuhei
    </footer>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js"
        integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW"
        crossorigin="anonymous"></script>
</body>

</html>

python AIChatBOT

import re
import datetime

class Chatbot:
    def __init__(self):
        self.context = {}
        self.history = []
        self.user_name = None
        self.current_intent = None  # 現在の意図を保持
        self.emotion_state = "neutral"  # ユーザーの感情状態
        self.long_term_memory = {}  # ユーザーの好みなどを記憶する

    # コンテキストと履歴を更新
    def update_context(self, key, value):
        self.context[key] = value

    def add_to_history(self, user_input, bot_response):
        self.history.append({"user": user_input, "bot": bot_response})

    # 感情を分析
    def analyze_emotion(self, user_input):
        if re.search(r"疲れた|悲しい", user_input):
            return "sad"
        elif re.search(r"嬉しい|楽しい", user_input):
            return "happy"
        else:
            return "neutral"

    # 意図の認識
    def intent_recognition(self, user_input):
        if re.search(r"こんにちは|おはよう", user_input):
            return "greeting"
        elif re.search(r"名前は|あなたは誰", user_input):
            return "identity"
        elif re.search(r"ありがとう", user_input):
            return "thanks"
        elif re.search(r"天気|天候", user_input):
            return "weather"
        elif re.search(r"日付|時間", user_input):
            return "time"
        elif re.search(r"さようなら|バイバイ", user_input):
            return "farewell"
        elif re.search(r"趣味", user_input):
            return "hobby"
        elif re.search(r"タスク|予定", user_input):
            return "task_management"
        else:
            return "unknown"

    # 意図に応じた応答生成
    def handle_intent(self, intent, user_input):
        if intent == "greeting":
            return self.greet_user()
        elif intent == "identity":
            return self.ask_for_name()
        elif intent == "thanks":
            return "どういたしまして！"
        elif intent == "weather":
            return self.get_weather()
        elif intent == "time":
            return self.get_time()
        elif intent == "farewell":
            return "さようなら！またお会いしましょう。"
        elif intent == "hobby":
            return self.ask_hobby()
        elif intent == "task_management":
            return self.manage_task()
        else:
            return "すみません、よくわかりません。もう一度お願いします。"

    # 挨拶応答
    def greet_user(self):
        if self.user_name:
            return f"こんにちは、{self.user_name}さん！今日はどうされましたか？"
        else:
            return "こんにちは！お名前を教えていただけますか？"

    # 名前を聞く
    def ask_for_name(self):
        if not self.user_name:
            self.current_intent = "ask_name"
            return "私はあなたの名前をまだ聞いていませんね。教えていただけますか？"
        else:
            return f"あなたのお名前は{self.user_name}ですね！"

    # 趣味について聞く
    def ask_hobby(self):
        if "hobby" not in self.long_term_memory:
            self.current_intent = "ask_hobby"
            return "趣味は何ですか？"
        else:
            hobby = self.long_term_memory['hobby']
            return f"以前おっしゃった趣味は{hobby}ですね！"

    # タスク管理（例: カレンダーに予定を追加）
    def manage_task(self):
        self.current_intent = "task_management"
        return "新しい予定を追加したいのですか？詳細を教えてください。"

    # 天気情報の取得（仮想）
    def get_weather(self):
        return "今日は晴れで、気温は22度です。"

    # 日付・時間を取得
    def get_time(self):
        now = datetime.datetime.now()
        return f"今は{now.strftime('%Y年%m月%d日 %H:%M:%S')}です。"

    # 応答を感情に基づいて調整
    def adjust_response_by_emotion(self, response):
        if self.emotion_state == "sad":
            return f"元気出してくださいね。{response}"
        elif self.emotion_state == "happy":
            return f"素晴らしいですね！{response}"
        else:
            return response

    # 名前を更新
    def update_name(self, user_input):
        self.user_name = user_input
        self.long_term_memory['name'] = user_input

    # 趣味を保存
    def update_hobby(self, user_input):
        self.long_term_memory['hobby'] = user_input

    # 応答のメインロジック
    def chatbot_response(self, user_input):
        if self.current_intent == "ask_name":
            self.update_name(user_input)
            return f"お名前は{self.user_name}さんですね！よろしくお願いします！"
        elif self.current_intent == "ask_hobby":
            self.update_hobby(user_input)
            return f"{self.user_name}さんの趣味は{user_input}ですね！"

        # 感情分析
        self.emotion_state = self.analyze_emotion(user_input)

        # 意図解析
        intent = self.intent_recognition(user_input)

        # 応答生成
        response = self.handle_intent(intent, user_input)

        # コンテキストと履歴の更新
        self.add_to_history(user_input, response)
        return self.adjust_response_by_emotion(response)

# チャットボットを実行
def run_chatbot():
    chatbot = Chatbot()
    
    # 初回挨拶
    print("ボット: こんにちは！お名前を教えてください。")
    
    while True:
        user_input = input("あなた: ")
        
        if user_input == "終了":
            print("チャットを終了します。")
            break
        
        bot_response = chatbot.chatbot_response(user_input)
        print("ボット: " + bot_response)

# チャットボットを実行
run_chatbot()

Java ペイントソフト

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.util.Stack;
import javax.imageio.ImageIO;
import java.io.File;

public class AdvancedPaintAppWithUndoRedo extends JFrame {

    private DrawPanel drawPanel;
    private Color currentColor = Color.BLACK;
    private int brushSize = 4;
    private String currentTool = "Brush";
    private Stack<BufferedImage> undoStack = new Stack<>();
    private Stack<BufferedImage> redoStack = new Stack<>();

    public AdvancedPaintAppWithUndoRedo() {
        setTitle("Advanced Paint Application with Undo/Redo");
        setSize(800, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        drawPanel = new DrawPanel();
        add(drawPanel, BorderLayout.CENTER);

        // メニューバーの作成
        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("File");
        JMenuItem saveItem = new JMenuItem("Save");
        JMenuItem openItem = new JMenuItem("Open");
        JMenuItem clearItem = new JMenuItem("Clear");
        saveItem.addActionListener(e -> saveImage());
        openItem.addActionListener(e -> openImage());
        clearItem.addActionListener(e -> drawPanel.clearCanvas());
        fileMenu.add(saveItem);
        fileMenu.add(openItem);
        fileMenu.add(clearItem);
        menuBar.add(fileMenu);

        JMenu toolMenu = new JMenu("Tools");
        JMenuItem colorItem = new JMenuItem("Choose Color");
        JMenuItem brushItem = new JMenuItem("Brush Size");
        JMenuItem toolBrush = new JMenuItem("Brush");
        JMenuItem toolLine = new JMenuItem("Line");
        JMenuItem toolRect = new JMenuItem("Rectangle");
        JMenuItem toolOval = new JMenuItem("Oval");
        JMenuItem toolText = new JMenuItem("Text");

        colorItem.addActionListener(e -> chooseColor());
        brushItem.addActionListener(e -> chooseBrushSize());
        toolBrush.addActionListener(e -> currentTool = "Brush");
        toolLine.addActionListener(e -> currentTool = "Line");
        toolRect.addActionListener(e -> currentTool = "Rectangle");
        toolOval.addActionListener(e -> currentTool = "Oval");
        toolText.addActionListener(e -> currentTool = "Text");

        toolMenu.add(colorItem);
        toolMenu.add(brushItem);
        toolMenu.add(toolBrush);
        toolMenu.add(toolLine);
        toolMenu.add(toolRect);
        toolMenu.add(toolOval);
        toolMenu.add(toolText);
        menuBar.add(toolMenu);

        JMenu editMenu = new JMenu("Edit");
        JMenuItem undoItem = new JMenuItem("Undo");
        JMenuItem redoItem = new JMenuItem("Redo");
        undoItem.addActionListener(e -> drawPanel.undo());
        redoItem.addActionListener(e -> drawPanel.redo());
        editMenu.add(undoItem);
        editMenu.add(redoItem);
        menuBar.add(editMenu);

        setJMenuBar(menuBar);
    }

    // メインメソッド
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            AdvancedPaintAppWithUndoRedo app = new AdvancedPaintAppWithUndoRedo();
            app.setVisible(true);
        });
    }

    // 色を選択する
    private void chooseColor() {
        Color color = JColorChooser.showDialog(null, "Choose a Color", currentColor);
        if (color != null) {
            currentColor = color;
            drawPanel.setColor(color);
        }
    }

    // ブラシサイズを選択する
    private void chooseBrushSize() {
        String sizeStr = JOptionPane.showInputDialog(this, "Enter brush size:", brushSize);
        if (sizeStr != null) {
            try {
                int size = Integer.parseInt(sizeStr);
                if (size > 0) {
                    brushSize = size;
                    drawPanel.setBrushSize(size);
                }
            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(this, "Invalid size entered.");
            }
        }
    }

    // 画像を保存する
    private void saveImage() {
        JFileChooser fileChooser = new JFileChooser();
        if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try {
                ImageIO.write(drawPanel.getImage(), "png", file);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    // 画像を開く
    private void openImage() {
        JFileChooser fileChooser = new JFileChooser();
        if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try {
                BufferedImage image = ImageIO.read(file);
                drawPanel.setImage(image);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    // 描画用のパネル
    class DrawPanel extends JPanel {

        private BufferedImage image;
        private Graphics2D g2;
        private int startX, startY, endX, endY;

        public DrawPanel() {
            setPreferredSize(new Dimension(800, 600));
            setDoubleBuffered(false);
            addMouseListener(new MouseAdapter() {
                @Override
                public void mousePressed(MouseEvent e) {
                    startX = e.getX();
                    startY = e.getY();
                    if (g2 != null) {
                        if (currentTool.equals("Brush")) {
                            g2.fillOval(startX, startY, brushSize, brushSize);
                        }
                        saveToUndoStack();
                    }
                    repaint();
                }

                @Override
                public void mouseReleased(MouseEvent e) {
                    endX = e.getX();
                    endY = e.getY();
                    if (g2 != null) {
                        switch (currentTool) {
                            case "Line":
                                g2.drawLine(startX, startY, endX, endY);
                                break;
                            case "Rectangle":
                                g2.drawRect(Math.min(startX, endX), Math.min(startY, endY),
                                        Math.abs(startX - endX), Math.abs(startY - endY));
                                break;
                            case "Oval":
                                g2.drawOval(Math.min(startX, endX), Math.min(startY, endY),
                                        Math.abs(startX - endX), Math.abs(startY - endY));
                                break;
                            case "Text":
                                String text = JOptionPane.showInputDialog("Enter text:");
                                if (text != null) {
                                    g2.drawString(text, startX, startY);
                                }
                                break;
                        }
                    }
                    saveToUndoStack();
                    repaint();
                }
            });

            addMouseMotionListener(new MouseMotionAdapter() {
                @Override
                public void mouseDragged(MouseEvent e) {
                    if (currentTool.equals("Brush")) {
                        g2.fillOval(e.getX(), e.getY(), brushSize, brushSize);
                    }
                    repaint();
                }
            });

            clearCanvas();
        }

        // Undoスタックに現在の状態を保存
        private void saveToUndoStack() {
            BufferedImage undoImage = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
            Graphics2D g = undoImage.createGraphics();
            g.drawImage(image, 0, 0, null);
            g.dispose();
            undoStack.push(undoImage);
            redoStack.clear();  // 新しいアクションの後、Redoをクリア
        }

        // Undo機能
        public void undo() {
            if (!undoStack.isEmpty()) {
                redoStack.push(image);
                image = undoStack.pop();
                g2 = image.createGraphics();
                repaint();
            }
        }

        // Redo機能
        public void redo() {
            if (!redoStack.isEmpty()) {
                undoStack.push(image);
                image = redoStack.pop();
                g2 = image.createGraphics();
                repaint();
            }
        }

        // 色を設定
        public void setColor(Color color) {
            if (g2 != null) {
                g2.setColor(color);
            }
        }

        // ブラシサイズを設定
        public void setBrushSize(int size) {
            brushSize = size;
        }

        // キャンバスをクリア
        public void clearCanvas() {
            image = new BufferedImage(800, 600, BufferedImage.TYPE_INT_ARGB);
            g2 = image.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setPaint(Color.WHITE);
            g2.fillRect(0, 0, image.getWidth(), image.getHeight());
            g2.setPaint(Color.BLACK);
            repaint();
        }

        // 描画イメージを取得
        public BufferedImage getImage() {
            return image;
        }

        // 描画イメージをセット
        public void setImage(BufferedImage img) {
            image = img;
            g2 = image.createGraphics();
            repaint();
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (image != null) {
                g.drawImage(image, 0, 0, null);
            }
        }
    }
}

Java テキストエディタ

import javax.swing.*;
import javax.swing.undo.UndoManager;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;

public class AdvancedTextEditor extends JFrame implements ActionListener {
    JTabbedPane tabbedPane;
    JTextArea textArea;
    JMenuBar menuBar;
    JMenu fileMenu, editMenu, formatMenu, themeMenu;
    JMenuItem newItem, openItem, saveItem, saveAllItem, closeItem;
    JMenuItem cutItem, copyItem, pasteItem, findItem, replaceItem, undoItem, redoItem;
    JMenuItem fontItem, lightThemeItem, darkThemeItem;
    JFileChooser fileChooser;
    JLabel statusBar;
    UndoManager undoManager = new UndoManager();
    JPopupMenu contextMenu;

    public AdvancedTextEditor() {
        setTitle("Advanced Text Editor");
        setSize(800, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        tabbedPane = new JTabbedPane();
        add(tabbedPane, BorderLayout.CENTER);

        statusBar = new JLabel("Status: Ready | Line: 1, Column: 1");
        add(statusBar, BorderLayout.SOUTH);

        menuBar = new JMenuBar();

        // ファイルメニューの作成
        fileMenu = new JMenu("File");
        newItem = new JMenuItem("New");
        openItem = new JMenuItem("Open");
        saveItem = new JMenuItem("Save");
        saveAllItem = new JMenuItem("Save All");
        closeItem = new JMenuItem("Close");
        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.add(saveAllItem);
        fileMenu.add(closeItem);

        // 編集メニューの作成
        editMenu = new JMenu("Edit");
        cutItem = new JMenuItem("Cut");
        copyItem = new JMenuItem("Copy");
        pasteItem = new JMenuItem("Paste");
        undoItem = new JMenuItem("Undo");
        redoItem = new JMenuItem("Redo");
        findItem = new JMenuItem("Find");
        replaceItem = new JMenuItem("Replace");
        editMenu.add(cutItem);
        editMenu.add(copyItem);
        editMenu.add(pasteItem);
        editMenu.add(undoItem);
        editMenu.add(redoItem);
        editMenu.add(findItem);
        editMenu.add(replaceItem);

        // フォーマットメニューの作成
        formatMenu = new JMenu("Format");
        fontItem = new JMenuItem("Change Font");
        formatMenu.add(fontItem);

        // テーマメニューの作成
        themeMenu = new JMenu("Themes");
        lightThemeItem = new JMenuItem("Light Theme");
        darkThemeItem = new JMenuItem("Dark Theme");
        themeMenu.add(lightThemeItem);
        themeMenu.add(darkThemeItem);

        // メニューバーにメニューを追加
        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(formatMenu);
        menuBar.add(themeMenu);

        setJMenuBar(menuBar);

        // アクションリスナーの設定
        newItem.addActionListener(this);
        openItem.addActionListener(this);
        saveItem.addActionListener(this);
        saveAllItem.addActionListener(this);
        closeItem.addActionListener(this);
        cutItem.addActionListener(this);
        copyItem.addActionListener(this);
        pasteItem.addActionListener(this);
        undoItem.addActionListener(this);
        redoItem.addActionListener(this);
        findItem.addActionListener(this);
        replaceItem.addActionListener(this);
        fontItem.addActionListener(this);
        lightThemeItem.addActionListener(this);
        darkThemeItem.addActionListener(this);

        // ドラッグ&ドロップ対応
        new DropTarget(tabbedPane, new FileDropHandler());

        // コンテキストメニューの設定
        contextMenu = new JPopupMenu();
        contextMenu.add(cutItem);
        contextMenu.add(copyItem);
        contextMenu.add(pasteItem);
    }

    // アクションリスナーの処理
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == newItem) {
            addNewTab();
        }
        // 他のアクションもここに追加
    }

    // 新しいタブを追加するメソッド
    private void addNewTab() {
        JTextArea textArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(textArea);
        tabbedPane.add("Untitled", scrollPane);
        tabbedPane.setSelectedComponent(scrollPane);
        textArea.getDocument().addUndoableEditListener(e -> undoManager.addEdit(e.getEdit()));
    }

    // ファイルドロップハンドラ
    @SuppressWarnings("unchecked")
    class FileDropHandler extends DropTargetAdapter {
        @Override
        public void drop(DropTargetDropEvent dtde) {
            dtde.acceptDrop(DnDConstants.ACTION_COPY);
            try {
                java.util.List<File> droppedFiles = (java.util.List<File>) dtde.getTransferable()
                        .getTransferData(DataFlavor.javaFileListFlavor);
                for (File file : droppedFiles) {
                    openFile(file);
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    // ファイルを開くメソッド
    private void openFile(File file) {
        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
            JTextArea textArea = new JTextArea();
            textArea.read(reader, null);
            JScrollPane scrollPane = new JScrollPane(textArea);
            tabbedPane.add(file.getName(), scrollPane);
            tabbedPane.setSelectedComponent(scrollPane);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            AdvancedTextEditor editor = new AdvancedTextEditor();
            editor.setVisible(true);
        });
    }
}