如果将
JButtons选项作为放入
JOptionPane，则需要指定单击它们时发生的情况。由于您似乎没有任何按钮
Action或
ActionListener绑定到按钮，因此什么也没有发生。
import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JOptionPane;import javax.swing.SwingUtilities;public class JOptionPaneTest { public void createAndShowJOptionPane() { final JButton b1 = new JButton("Yes, please"); b1.setName("yes_please"); final JButton b2 = new JButton("No, thx"); b2.setName("no_thx"); final JButton b3 = new JButton("Leave me alone"); b3.setName("leave_me_alone"); Object[] options = new Object[]{b1, b2, b3}; final JOptionPane optionPane = new JOptionPane("Message", JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_CANCEL_OPTION, null, options, options[2]); final JDialog dialog = optionPane.createDialog("Title"); b1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println(b1.getText()); optionPane.setValue(0); dialog.dispose(); } }); b2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println(b2.getText()); optionPane.setValue(1); dialog.dispose(); } }); b3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println(b3.getText()); optionPane.setValue(2); dialog.dispose(); } }); dialog.setVisible(true); if ((Integer)optionPane.getValue() == 0) { System.out.println("Woohoo!"); } } public static void main(String[] argv) { SwingUtilities.invokeLater(new Runnable() { public void run() { JOptionPaneTest test = new JOptionPaneTest(); test.createAndShowJOptionPane(); } }); }}
