JOptionPane.showConfirmDialog例…

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

public class jjfrom extends JFrame {

 

private static final long serialVersionUID = 1L;

public jjfrom() {

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    getContentPane().add(new JLabel("Placeholder label"));

    pack();

    setSize(200, 200);

    setVisible(true);

    int replaced = JOptionPane.showConfirmDialog(this,

        "Replace existing selection?");

    String result = "?";

    switch (replaced) {

    case JOptionPane.CANCEL_OPTION:

      result = "Canceled";

      break;

    case JOptionPane.CLOSED_OPTION:

      result = "Closed";

      break;

    case JOptionPane.NO_OPTION:

      result = "No";

      break;

    case JOptionPane.YES_OPTION:

      result = "Yes";

      break;

    default:

      ;

    }

    System.out.println("Replace? " + result);

  }

  public static void main(String[] args) {

    new jjfrom();

  }

}