java - 如何使用 JOptionPane 的响应？

Question

这是我第一次使用确认框，我想请教一些如何使用它的建议，我想使用用户输入的“是或否”，但不知道该怎么做？如果我想在 if 语句中引用来自 JOptionPane 的输入，该怎么做？

JOptionPane.showConfirmDialog(null, "Click yes to terminate. ", "TERMINATE SIMULATION?", JOptionPane.YES_NO_OPTION);

谢谢。

Answer 1

像这样使用它:

   int result = JOptionPane.showConfirmDialog(null, "Click yes to terminate. ", "TERMINATE SIMULATION?", JOptionPane.YES_NO_OPTION);

    if (JOptionPane.YES_OPTION == result) {
                System.out.println("yes");
     } else if (JOptionPane.NO_OPTION == result) {
                System.out.println("No");
     }else{
            System.out.println("Nothing");
    }

还可以在下面找到选项类型和返回值(来自源代码):

 /**
     * Type meaning Look and Feel should not supply any options -- only
     * use the options from the <code>JOptionPane</code>.
     */
    public static final int         DEFAULT_OPTION = -1;
    /** Type used for <code>showConfirmDialog</code>. */
    public static final int         YES_NO_OPTION = 0;
    /** Type used for <code>showConfirmDialog</code>. */
    public static final int         YES_NO_CANCEL_OPTION = 1;
    /** Type used for <code>showConfirmDialog</code>. */
    public static final int         OK_CANCEL_OPTION = 2;

    //
    // Return values.
    //
    /** Return value from class method if YES is chosen. */
    public static final int         YES_OPTION = 0;
    /** Return value from class method if NO is chosen. */
    public static final int         NO_OPTION = 1;
    /** Return value from class method if CANCEL is chosen. */
    public static final int         CANCEL_OPTION = 2;
    /** Return value form class method if OK is chosen. */
    public static final int         OK_OPTION = 0;
    /** Return value from class method if user closes window without selecting
     * anything, more than likely this should be treated as either a
     * <code>CANCEL_OPTION</code> or <code>NO_OPTION</code>. */
    public static final int         CLOSED_OPTION = -1;

此外，不要直接对响应值进行 int 检查，例如 if(1==result) 对于 NO_OPTION，始终使用 JoptionPane 中的常量 类。