Java如何在JTable组件中将数字数据右对齐？
要使JTable单元格中的数据类型数字右对齐，我们需要实现一个TableModel。所述TableModel的接口getColumnClass(intindex)的实现返回class的单元格值的，该信息用于通过JTable部件设置为列的默认渲染器和编辑器。
package org.nhooo.example.swing;
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import java.awt.*;
public class JTableNumberRightAlign extends JPanel {
public JTableNumberRightAlign() {
initializeUI();
}
private void initializeUI() {
setLayout(new BorderLayout());
setPreferredSize(new Dimension(450, 200));
JTable table = new JTable(new NumberTableModel());
table.setFillsViewportHeight(true);
JScrollPane pane = new JScrollPane(table);
add(pane, BorderLayout.CENTER);
}
public static void showFrame() {
JPanel panel = new JTableNumberRightAlign();
panel.setOpaque(true);
JFrame frame = new JFrame("JTable Number Align");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JTableNumberRightAlign.showFrame();
}
});
}
class NumberTableModel extends AbstractTableModel {
String[] columns = {"STUDENT ID", "NAME", "YEARS", "SCORE"};
Object[][] data = {
{"S001", "ALICE", 10, 8.75},
{"S002", "BOB", 10, 7.50},
{"S003", "CAROL", 10, 9.00},
{"S004", "IGNASIA", 10, 9.00},
{"S005", "MALLORY", 10, 8.50}
};
public int getRowCount() {
return data.length;
}
public int getColumnCount() {
return columns.length;
}
@Override
public String getColumnName(int column) {
return columns[column];
}
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
//JTable使用此方法定义默认值
//每个单元格的渲染器或编辑器。例如，如果您有
//布尔数据，它将呈现为复选框。一种
//数字值右对齐。
@Override
public Class<?> getColumnClass(int columnIndex) {
return data[0][columnIndex].getClass();
}
}
}这是程序的结果：