如何从一个对象中创建一个用列填充的组合框？(Java)
如何从一个对象中创建一个用列填充的组合框？(Java)
提问于 2019-06-04 23:31:20
我有一个名为“书”的对象，其中有标题、作者、bookID等列。在Microsoft SQL Server上创建。一切都与Netbeans相连，工作正常。我也有过滤/搜索选项，它也工作得很好，但我想有一个组合框充满图书列，如标题，作者等，我想选择一个列，并只在其中搜索。
我已经有一个名为BookComboBoxModel的class，它返回books (下面的代码)，但是我需要该表中的book列，而不是comboBox上的Book.toString()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;
}
}回答 1
Stack Overflow用户
发布于 2019-06-04 23:40:46
您可以创建对象(客户)的array，然后将其传递给combobox，如下所示：combo = new JComboBox(customers);
请看下面的示例：
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;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56447024
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