Question

import javax.swing.*;

public class TestProject {
    public static void main(String[] args) {

        JOptionPane.showMessageDialog(null, "Just about to draw the best piece of artwork in my life, need input please.");

        String name= JOptionPane.showInputDialog("Imagine a car, what is it's name?");
        JOptionPane.showMessageDialog(null, "Ah okay, so it's name is " + name);


        String bodyColour = JOptionPane.showInputDialog("Cool. What colour was the body of the car? \n Blue, Red, Black, Green or Orange? (More to come in DLC's) ");
        JOptionPane.showMessageDialog(null, "Mhmm");

        String wheelColour= JOptionPane.showInputDialog("Colour of the wheels? ");
        JOptionPane.showMessageDialog(null, "Very ordinary...");

    String doorColour = JOptionPane.showInputDialog("Last... And probably least, colour of the door?");
        JOptionPane.showMessageDialog(null, "Finished the drawing!");

    }
}

这是我上面的代码，我想知道用户如何按下取消，（因为通常它就像用户按下了'＃ok;＆＃39;）或弹出提示中的x按钮，我想它可以使用某种类型的监听器或者System.exit（0）;但我不知道如何实现它，因为我对Java来说还不够新

Answer 1

这可以解决您的问题

   if(name == null || (name != null && ("".equals(name))))   
   {
     System.exit(0);// or you can throw exception
    }

在第一个JOptionPane.showInputDialog()

之后写下这行代码

您的代码（刚刚添加了上面的代码段）

import javax.swing.*;

public class TestProject {
public static void main(String[] args) {

    JOptionPane.showMessageDialog(null, "Just about to draw the best piece of artwork in my life, need input please.");

    String name= JOptionPane.showInputDialog("Imagine a car, what is it's name?");
    if(name == null || (name != null && ("".equals(name))))   
    {
      System.exit(0);// or you can throw exception
    }
    JOptionPane.showMessageDialog(null, "Ah okay, so it's name is " + name);


    String bodyColour = JOptionPane.showInputDialog("Cool. What colour was the body of the car? \n Blue, Red, Black, Green or Orange? (More to come in DLC's) ");
    JOptionPane.showMessageDialog(null, "Mhmm");

    String wheelColour= JOptionPane.showInputDialog("Colour of the wheels? ");
    JOptionPane.showMessageDialog(null, "Very ordinary...");

    String doorColour = JOptionPane.showInputDialog("Last... And probably least, colour of the door?");
    JOptionPane.showMessageDialog(null, "Finished the drawing!");

 }
}

Answer 2

如果用户按下提示上的取消或x按钮，则showInputDialog将返回null。

Answer 3

像这样使用confirmDialog：

int answer = JOptionPane.showConfirmDialog(null, "Your Message", "Your Title", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE);

if(answer == JOptionPane.CANCEL_OPTION){
    System.out.println("canceled");
} else {
    System.out.println("OK");
}

JOptionPane如何退出提示

3 个答案: