JTable JComboBox错误的第一项名称 [英] JTable JComboBox wrong first item name

问题描述

我在JTable上添加了Swing JComboBox，但是我的第一项标签始终是javax.swing.JComboBox(...

I added a Swing JComboBox to a JTable, but the label of my first item is always javax.swing.JComboBox(...

我在做什么错了?

更新:这是我的代码:

import java.awt.Color;
import java.awt.Dimension;
import java.util.ArrayList;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.DefaultTableModel;

public class TableSelection extends JPanel {

    private DefaultTableModel model = new DefaultTableModel();
    private JTable table = new JTable(model);

    public TableSelection() {
        model = (DefaultTableModel) table.getModel();
        ArrayList<String> labels = new ArrayList<String>();
        labels.add("");
        for (int i = 1; i < 10 + 1; i++) {
            labels.add("" + (i - 1));
        }

        model.addColumn("Column");
        model.addColumn("Column2");

        JComboBox<String> jcombo1 = new JComboBox<String>();
        jcombo1.setModel(new DefaultComboBoxModel(labels.toArray()));
        jcombo1.setBackground(Color.WHITE);
        jcombo1.setSelectedIndex(1);
        DefaultCellEditor editor = new DefaultCellEditor(jcombo1);

        table.getColumnModel().getColumn(0).setCellEditor(editor);

        model.addRow(new JComboBox[]{jcombo1});

        table.setPreferredScrollableViewportSize(new Dimension(560, 300));
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        this.add(new JScrollPane(table));
        table.setRowSelectionInterval(0, 0);

    }

    public static void main(String[] args) {
        JFrame f = new JFrame("TableSelection");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new TableSelection());
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

推荐答案

基本问题在这里:

model.addRow(new JComboBox[]{combo});

不要将组件添加到表模型中.相反，让渲染器使用显示对象的字符串值的标签."您的初始标签为空String，如下所示.

Don't add components to the table model. Instead, let the renderer handle the job, using "a label that displays the object's string value." Your initial label, an empty String, is shown below.

model.addRow(new String[]{labels.get(0)});

此外:

• 接口代码，例如List<String> labels = new ArrayList<>()

从事件分派线程开始.

经过测试的代码

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.DefaultTableModel;

public class TableSelection extends JPanel {

    private final DefaultTableModel model = new DefaultTableModel();
    private final JTable table = new JTable(model);

    public TableSelection() {
        List<String> labels = new ArrayList<>();
        labels.add("");
        for (int i = 1; i < 10 + 1; i++) {
            labels.add("" + (i - 1));
        }
        model.addColumn("Column 1");
        model.addColumn("Column 2");

        JComboBox<String> combo = new JComboBox<>();
        combo.setModel(new DefaultComboBoxModel(labels.toArray()));
        combo.setBackground(Color.WHITE);
        combo.setSelectedIndex(1);
        DefaultCellEditor editor = new DefaultCellEditor(combo);
        table.getColumnModel().getColumn(0).setCellEditor(editor);
        //model.addRow(new JComboBox[]{combo});
        model.addRow(new String[]{labels.get(0)});
        table.setPreferredScrollableViewportSize(new Dimension(320, 120));
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        this.add(new JScrollPane(table));
        table.setRowSelectionInterval(0, 0);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame f = new JFrame("TableSelection");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.add(new TableSelection());
            f.pack();
            f.setLocationRelativeTo(null);
            f.setVisible(true);
        });
    }
}

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