import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

class DefaultTableModelSample extends JFrame {

   DefaultTableModelSample() {
      getContentPane().setLayout(new FlowLayout());

      String[] colName = { "A", "B", "C" };

      int row = 50;
      int col = 3;
      String[][] rowDat = new String[row][col];

      for(int i=0;i < row; i++) {
            for(int j=0;j < col; j++) {
               rowDat[i][j] = colName[j]+String.valueOf(i);
            }
      }

      DefaultTableModel tm 
              = new DefaultTableModel(rowDat, colName);
      JTable tb = new JTable(tm);
      JScrollPane sp = new JScrollPane(tb);
      sp.setPreferredSize(new Dimension(300, 150));
      getContentPane().add(sp);

      String[] data = { "最終A", "最終B", "最終C" };
      tm.addRow(data);

      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setTitle("JTableを使ってテーブルを表示");
      setSize(530, 200);
      setVisible(true);
   }
   public static void main(String[] args) {
      new DefaultTableModelSample();
   }
}