包含信息的Java ActionListeners

我有一个程序，我想点击按钮，让他们把信息传递给他们的ActionListener。这是一个图书馆程序，用户点击一个图书图像，打开一个新的JFrame，其中包含关于该特定图书的信息。如何根据按下的按钮分别显示信息？（我想要一个通用的actionListener，而不是单个的，因为我有200多本书。）

你可以。。。 使用键控按钮的

映射

，将值链接到该按钮。因此，当单击按钮时，您将使用

JButton

作为键，并向

Map

查询相关值

查看更多详细信息

你可以。。。 创建一个简单的、自定义的

ActionListener

，它以“book”为参考，在单击时能够执行所需的操作，但它是为单个book定制的

类似于

public class BookActionHandler implements ActionListener {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(book.getTitle());
    btn.addActionListener(new BookActionHandler(book));
    //...
}

public class BookActionHandler extends AbstractAction {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
        putValue(NAME, book.getTitle());
        putValue(LARGE_ICON_KEY, book.getIcon());
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(new BookActionHandler(book));
    //...
}

然后你可以创建你的按钮，比如

public class BookActionHandler implements ActionListener {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(book.getTitle());
    btn.addActionListener(new BookActionHandler(book));
    //...
}

public class BookActionHandler extends AbstractAction {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
        putValue(NAME, book.getTitle());
        putValue(LARGE_ICON_KEY, book.getIcon());
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(new BookActionHandler(book));
    //...
}

你可以。。。 使用

Action

API将给定的“book”与按钮关联，允许

Action

配置按钮，并在单击按钮时为其提供执行所需操作的方法

有关更多详细信息，请参阅

类似于

public class BookActionHandler implements ActionListener {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(book.getTitle());
    btn.addActionListener(new BookActionHandler(book));
    //...
}

public class BookActionHandler extends AbstractAction {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
        putValue(NAME, book.getTitle());
        putValue(LARGE_ICON_KEY, book.getIcon());
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(new BookActionHandler(book));
    //...
}

然后你可以创建你的按钮，比如

public class BookActionHandler implements ActionListener {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(book.getTitle());
    btn.addActionListener(new BookActionHandler(book));
    //...
}

public class BookActionHandler extends AbstractAction {
    private Book book;
    public BookActionHandler(Book book) {
        this.book = book;
        putValue(NAME, book.getTitle());
        putValue(LARGE_ICON_KEY, book.getIcon());
    }

    public void actionPerformed(ActionEvent evt) {
        BookFrame bookFrame = new BookFrame(book); 
        //...
        bookFrame.setVisible(true);
    }
}

for (Book book : listOfBooks) {
    JButton btn = new JButton(new BookActionHandler(book));
    //...
}

---

我想出来了，所以我会在这里发布，以防其他人也有同样的问题：

    class BookListener implements ActionListener{
        public Book myBook;
        public BookListener(Book b) {
            this.myBook = b;
        }
    public void actionPerformed(ActionEvent e) {

您只需将其插入类定义中，并在调用actionListener时：

    bookButton.addActionListener(new BookListener(b));

---

这似乎是一个非常基本的问题，只要稍加研究就能解决。报告涵盖了这一点。