用逗号格式化 JTable 列单元格中的整数
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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