swing 消息框 joptionpane

1.使用JOptionPane提示用户确认

import javax.swing.JOptionPane;

import javax.swing.JDialog;
import javax.swing.JOptionPane;

public class JOptionPaneTest2 {
  public static void main(String[] args) {
    JDialog.setDefaultLookAndFeelDecorated(true);
    int response = JOptionPane.showConfirmDialog(null, "Do you want to continue?", "Confirm",
        JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
    if (response == JOptionPane.NO_OPTION) {
      System.out.println("No button clicked");
    } else if (response == JOptionPane.YES_OPTION) {
      System.out.println("Yes button clicked");
    } else if (response == JOptionPane.CLOSED_OPTION) {
      System.out.println("JOptionPane closed");
    }
  }
}

2.使用JOptionPane预先选

import javax.swing.JDialog;
import javax.swing.JOptionPane;

public class JOptionPaneTest3 {
  public static void main(String[] args) {
    JDialog.setDefaultLookAndFeelDecorated(true);
    Object[] selectionValues = { "Pandas", "Dogs", "Horses" };
    String initialSelection = "Dogs";
    Object selection = JOptionPane.showInputDialog(null, "What are your favorite animals?",
        "Zoo Quiz", JOptionPane.QUESTION_MESSAGE, null, selectionValues, initialSelection);
    System.out.println(selection);
  }
}

3.获取用户选择JOptionPane

import javax.swing.JDialog;
import javax.swing.JOptionPane;

public class GettingJOptionPaneSelectionDemo {

  public static void main(String[] a) {

    String multiLineMsg[] = { "Hello,", "World" };
    JOptionPane pane = new JOptionPane();
    pane.setMessage(multiLineMsg);
    JDialog d = pane.createDialog(null, "title");
    d.setVisible(true);
    int selection = getSelection(pane);

    switch (selection) {
    case JOptionPane.OK_OPTION:
      System.out.println("OK_OPTION");
      break;
    case JOptionPane.CANCEL_OPTION:
      System.out.println("CANCEL");
      break;
    default:
      System.out.println("Others");
    }

  }

  public static int getSelection(JOptionPane optionPane) {
    int returnValue = JOptionPane.CLOSED_OPTION;

    Object selectedValue = optionPane.getValue();
    if (selectedValue != null) {
      Object options[] = optionPane.getOptions();
      if (options == null) {
        if (selectedValue instanceof Integer) {
          returnValue = ((Integer) selectedValue).intValue();
        }
      } else {
        for (int i = 0, n = options.length; i < n; i++) {
          if (options[i].equals(selectedValue)) {
            returnValue = i;
            break; // out of for loop
          }
        }
      }
    }
    return returnValue;
  }

}