如何在 Java Swing 中获取 JTable 的行和列数

如需计算表中行的数量，请使用 getRowCount() 方法 −

table.getRowCount()

如需计算表中列的数量，请使用 getColumnCount() 方法 −

table.getColumnCount()

以下是一个用于获取 JTable 行数和列数的示例 −

示例

package my;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class SwingDemo {
   public static void main(String[] argv) throws Exception {
      DefaultTableModel tableModel = new DefaultTableModel();
      JTable table = new JTable(tableModel);
      tableModel.addColumn("Language/ Technology");
      tableModel.addColumn("Text Tutorial");
      tableModel.addColumn("Video Tutorial");
      tableModel.addColumn("Views");
      // prevent from resizing
      table.getTableHeader().setResizingAllowed(false);
      tableModel.addRow(new Object[] { "F#", "Yes", "No", "7890"});
      tableModel.addRow(new Object[] { "Blockchain", "Yes", "No", "10600"});
      tableModel.addRow(new Object[] { "SharePoint", "Yes", "Yes", "4900"});
      tableModel.addRow(new Object[] { "AWS", "No", "Yes", "8900"});
      tableModel.addRow(new Object[] { "Python", "Yes", "No", "6789"});
      tableModel.addRow(new Object[] { "Scala", "Yes", "No", "3400"});
      tableModel.addRow(new Object[] { "Swift", "No", "Yes", "9676"});
      tableModel.addRow(new Object[] { "C#", "Yes", "Yes", "1300"});
      tableModel.addRow(new Object[] { "NodeJS", "No", "Yes", "2350"});
      tableModel.addRow(new Object[] { "MVC", "Yes", "No", "1500"});
      tableModel.addRow(new Object[] { "ASP.NET", "Yes", "Yes", "3400"});
      tableModel.addRow(new Object[] { "Java", "Yes", "No", "9686"});
      tableModel.addRow(new Object[] { "jQuery", "Yes", "Yes", "4500"});
      System.out.println("Table rows = "+table.getRowCount());
      System.out.println("Table columns = "+table.getColumnCount());
      Font font = new Font("Verdana", Font.PLAIN, 12);
      table.setFont(font);
      JFrame frame = new JFrame();
      frame.setSize(600, 400);
      frame.add(new JScrollPane(table));
      frame.setVisible(true);
   }
}

这将生成如下输出，显示带有行和列的表 −

输出

行和列的数量如下所示在控制台中显示 −

更新于：30-7-2019

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