java - 如何创建一个填充对象列的组合框？ ( java )

Question

我有一个名为“Book”的对象，其中包含标题、作者、bookID 等列...在 Microsoft SQL Server 上创建。一切都与 Netbeans 连接并且工作正常。我还有一个过滤/搜索选项，效果也很好，但我想要一个组合框，其中填充了图书列，如标题、作者等，我想在其中选择一个列并仅在其中进行搜索。

我已经有一个名为 BookComboBoxModel 的 class ，它返回书籍(代码如下)，但我想要该表中的书籍列，而不是 Book.toString( comboBox

上的 ) 方法

//this is my book combo model that returns books into combobox

public class BookComboBoxModel extends AbstractListModel<Book> implements ComboBoxModel<Book> {

    private List <Book> data;
    private Book selectedItem;


    public BookComboBoxModel(List<Book> data) {
        this.data = data;
    }

    public BookComboBoxModel() {
    }

    public void add(List<Book> data) {
        this.data = data;
    }

    @Override
    public int getSize() {
        return data.size();
    }

    @Override
    public Book getElementAt(int index) {
        return data.get(index);
    }

    @Override
    public void setSelectedItem(Object anItem) {
        selectedItem = (Book) anItem;
    }

    @Override
    public Object getSelectedItem() {
        return selectedItem;
    }
}

Answer 1

您可以创建对象(客户)的数组，然后将其传递给组合框，如下所示:combo = new JComboBox(customers);

看一下示例:

import java.awt.BorderLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main extends JFrame {
  JLabel label;
  JComboBox combo;
  public static void main(String args[]) {
    new Main();
  }

  public Main() {
    label = new JLabel("Select a Customer");
    add(label, BorderLayout.NORTH);

    Customer customers[] = new Customer[6];
    customers[0] = new Customer("A", 1);
    customers[1] = new Customer("B", 6);
    customers[2] = new Customer("C", 2);
    customers[3] = new Customer("D", 3);
    customers[4] = new Customer("E", 4);
    customers[5] = new Customer("F", 5);

    combo = new JComboBox(customers);
    combo.addItemListener(e -> {
      Customer c = (Customer) e.getItem();
      label.setText("You selected customer id: " + c.getId());
    });
    JPanel panel = new JPanel();
    panel.add(combo);
    add(panel, BorderLayout.CENTER);

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(400, 200);
    setVisible(true);
  }
}

class Customer {
  private String name;
  private int id;

  public Customer(String name, int id) {
    this.name = name;
    this.id = id;
  }

  public String toString() {
    return getName();
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }
}