swing gui的工作是将侦听器添加到事件中，然后响应侦听器中的状态更改。
在您创建组件的代码中，您似乎正在检查行选择状态，这永远不会起作用，因为它只检查一次状态，而且在用户有机会做出选择之前。相反，您需要在jtable上使用一个监听器，更具体地说，是一个listselectionlistener，您可以通过它添加到jtable的选择模型中 table.getSelectionModel().addListSelectionListener(...) 还要注意：

int row = table.getSelectedRow();
if (table.isRowSelected(row)) {
    btnIniciarReparacin.setEnabled(true);
} else {
    btnIniciarReparacin.setEnabled(false);
}

可缩短为：

int row = table.getSelectedRow();
btnIniciarReparacin.setEnabled(table.isRowSelected(row));

e、 g.类似于：

table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
    public void valueChanged(ListSelectionEvent event) {
        int row = table.getSelectedRow();
        btnIniciarReparacin.setEnabled(table.isRowSelected(row));
    }
});

例如，如果按钮删除一行：

import java.awt.BorderLayout;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;

@SuppressWarnings("serial")
public class Test01 extends JPanel {
    private static final String[] COLUMNS = {"One", "Two", "Three", "Four"};
    private DefaultTableModel tableModel = new DefaultTableModel(COLUMNS, 0);
    private JTable table = new JTable(tableModel);
    private JButton deleteRowButton = new JButton("Delete Row");

    public Test01() {
        int tableRows = 20;
        for (int i = 0; i < tableRows; i++) {
            Integer[] row = new Integer[COLUMNS.length];
            for (int j = 0; j < row.length; j++) {
                row[j] = (int) (100 * Math.random());
            }
            tableModel.addRow(row);
        }

        table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {

            @Override
            public void valueChanged(ListSelectionEvent e) {
                int row = table.getSelectedRow();
                deleteRowButton.setEnabled(table.isRowSelected(row));
            }
        });

        deleteRowButton.addActionListener(e -> {
            int row = table.getSelectedRow();
            tableModel.removeRow(row);
        });
        deleteRowButton.setEnabled(false);
        JPanel bottomPanel = new JPanel();
        bottomPanel.add(deleteRowButton);

        setLayout(new BorderLayout());
        add(new JScrollPane(table));
        add(bottomPanel, BorderLayout.PAGE_END);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }

    private static void createAndShowGui() {
        Test01 mainPanel = new Test01();
        JFrame frame = new JFrame("Test01");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.add(mainPanel);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }
}