用逗号格式化 JTable 列单元格中的整数

问题描述

我有一个价格列，它以普通格式显示整数，例如 1000000.我想知道如何在使用 table.getValueAt() 检索时使用逗号对其进行格式化而不影响其值?

I have a Price column that displays integers in plain format like 1000000. I would like to know how can I format it with commas without affecting its value when retrieving with table.getValueAt()?

有没有像table.setColumnCellFormat(decimalFormat)这样的方法?

Is there a method like table.setColumnCellFormat(decimalFormat)?

推荐答案

您需要一个自定义的 TableCellRenderer，它可以按照您需要的方式格式化值.有关详细信息，请参阅使用自定义渲染器

You need a custom TableCellRenderer which can format the value the way you need it. See Using Custom Renderers for more details

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.text.NumberFormat;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {

            DefaultTableModel model = new DefaultTableModel(0, 1);
            for (int index = 10000; index < 11000; index++) {
                model.addRow(new Object[]{index});
            }

            JTable table = new JTable(model);
            table.getColumnModel().getColumn(0).setCellRenderer(new NumberTableCellRenderer());

            setLayout(new BorderLayout());
            add(new JScrollPane(table));

        }

        public class NumberTableCellRenderer extends DefaultTableCellRenderer {

            public NumberTableCellRenderer() {
                setHorizontalAlignment(JLabel.RIGHT);
            }

            @Override
            public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                if (value instanceof Number) {
                    value = NumberFormat.getNumberInstance().format(value);
                }
                return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
            }

        }

    }
}

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