java - Java中无论点击Jlist多少次，如何从Jlist中获取选定的值

Question

我希望能够使我的 JList 响应单击，即使多次按下也是如此。仅当单击另一个索引时才调用更改的值。这是默认行为。但是，我希望它始终告诉当点击发生时。从这个简单的例子中，很明显，只有单击一次，更改的值才会被触发，单击两次将不会响应。我需要这个特定的功能，主要原因是合法的，但解释起来更复杂.

public class TestFrame extends JFrame {

    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    TestFrame frame = new TestFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public TestFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));

        JList list = new JList();

        list.setModel(new AbstractListModel() {
            String[] values = new String[] {"one", "two", "three"};
            public int getSize() {
                return values.length;
            }
            public Object getElementAt(int index) {
                return values[index];
            }
        });

        list.addListSelectionListener(new ListSelectionListener() {

            @Override
            public void valueChanged(ListSelectionEvent e) {
                // TODO Auto-generated method stub

                System.out.println("selected index : "+list.getSelectedIndex());

            }


        });

        contentPane.add(list, BorderLayout.CENTER);
    }

}

Answer 1

您需要使用 MouseListener 来解决此问题:

  list.addMouseListener(new MouseAdapter() {
     @Override
     public void mousePressed(MouseEvent e) {
        int index = list.locationToIndex(e.getPoint());
        System.out.println("MouseListener index: " + index);
     }
  });