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Код

import java.awt.BorderLayout;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TableRowsAddRemove extends JFrame {


    private JTable jTable = new JTable(1, 1);

    public TableRowsAddRemove(){

        //Create table

        //VARIANTS A and B
        
        this.add(jTable, BorderLayout.CENTER);
        
        //VARIANT C
        
        //this.add(new JScrollPane(jTable), BorderLayout.CENTER);
        
        //Create buttons

        JButton button = new JButton("Add row");
        button.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addRowToTable();
            }
        });
        this.add(button, BorderLayout.WEST);

        button = new JButton("Remove empty rows");
        button.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                removeEmptyRowsFromTable();
            }
        });
        this.add(button, BorderLayout.EAST);

        //Finalise the window

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(800, 600);
        this.setVisible(true);

    }//end constructor

    public static void main(String[] args) {

        new TableRowsAddRemove();                
    }

    //PRIVATE METHODS

    private void addRowToTable(){
        ((DefaultTableModel)jTable.getModel()).addRow(new String[0]);
    }

    private void removeEmptyRowsFromTable(){
        DefaultTableModel model = (DefaultTableModel)jTable.getModel();
        
        int nCols = model.getColumnCount();
        boolean rowIsEmpty;
        Object oValue;
        
        for(int r = model.getRowCount() - 1; r >=0; r--){
            
            rowIsEmpty = true;
            
            for(int c = 0; c < nCols; c++){
                oValue = model.getValueAt(r, c);
                if(oValue != null && (! "".equals(oValue.toString().trim()))){
                    rowIsEmpty = false;
                    break;
                }
            }
            
            if(rowIsEmpty){
                model.removeRow(r);
            }        
        }
    }

}