如何在程序运行过程中关闭JFrame

Question

public class JFrameWithPanel extends JFrame implements ActionListener, ItemListener
{
    int packageIndex;
    double price;
    double[] prices = {49.99, 39.99, 34.99, 99.99};

    DecimalFormat money = new DecimalFormat("$0.00");
    JLabel priceLabel = new JLabel("Total Price: "+price);
    JButton button = new JButton("Check Price");
    JComboBox packageChoice = new JComboBox();
    JPanel pane = new JPanel();
    TextField text = new TextField(5);
    JButton accept = new JButton("Accept");
    JButton decline = new JButton("Decline");
    JCheckBox serviceTerms = new JCheckBox("I Agree to the Terms of Service.", false);
    JTextArea termsOfService = new JTextArea("This is a text area", 5, 10);

    public JFrameWithPanel()
    {
        super("JFrame with Panel");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pane.add(packageChoice);
        setContentPane(pane);
        setSize(250,250);
        setVisible(true);

        packageChoice.addItem("A+ Certification");
        packageChoice.addItem("Network+ Certification ");
        packageChoice.addItem("Security+ Certifictation");
        packageChoice.addItem("CIT Full Test Package");

        pane.add(button);
        button.addActionListener(this);

        pane.add(text);
        text.setEditable(false);
        text.setBackground(Color.WHITE);
        text.addActionListener(this);

        pane.add(termsOfService);
        termsOfService.setEditable(false);
        termsOfService.setBackground(Color.lightGray);

        pane.add(serviceTerms);
        serviceTerms.addItemListener(this);

        pane.add(accept);
        accept.addActionListener(this);

        pane.add(decline);
        decline.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e)
    {
        packageIndex = packageChoice.getSelectedIndex();
        price = prices[packageIndex];
        text.setText("$"+price);

        Object source = e.getSource();

        if(source == accept)
        {
            if(serviceTerms.isSelected() == false)
            {
                JOptionPane.showMessageDialog(null,"Please accept the terms of service.", "Terms of Service", JOptionPane.ERROR_MESSAGE);
            }
            else
            {
                JOptionPane.showMessageDialog(null,"Thank you. We will now move on to registering your product.");
                pane.dispose();
            }
        }
        else if(source == decline)
        {
            System.exit(0);
        }
    }

    public void itemStateChanged(ItemEvent e)
    {
        int select = e.getStateChange();
    }

    public static void main(String[] args)
    {
        String value1;
        int constant = 1, invalidNum = 0, answerParse, packNum, packPrice;

        JOptionPane.showMessageDialog(null,"Hello!"+"\nWelcome to the CIT Test Program.");

        JOptionPane.showMessageDialog(null,"IT WORKS!");
    }



}//class

如何关闭此框架，以便我的 JOptionPane 消息对话框可以在程序中继续，而无需完全退出程序。

编辑：我尝试了 .dispose() 但我得到了这个：

cannot find symbol
symbol  : method dispose()
location: class javax.swing.JPanel
                pane.dispose();
                    ^

Answer 1

尝试：改为 this.dispose() 。

JPanel 没有该方法，但 JFrame 可以

编辑

在您的 main 中，您没有调用您的 Frame：

public static void main(String[] args)  {
    String value1;
    int constant = 1, invalidNum = 0, answerParse, packNum, packPrice;

    JOptionPane.showMessageDialog(null,"Hello!"+"\nWelcome to the CIT Test Program.");

    JOptionPane.showMessageDialog(null,"IT WORKS!");
    }

尝试添加它并查看差异：

public static void main(String[] args)  {
    String value1;
    int constant = 1, invalidNum = 0, answerParse, packNum, packPrice;

    JOptionPane.showMessageDialog(null,"Hello!"+"\nWelcome to the CIT Test Program.");

    JOptionPane.showMessageDialog(null,"IT WORKS!");
    new JFrameWithPanel(); //<-- creating a JFrameWithPanel
}

同样在执行操作的方法中，您要显示对话框，然后进行处理，可能您想以相反的方式进行操作。

if(serviceTerms.isSelected() == false) {
    JOptionPane.showMessageDialog(null,"Please accept the terms of service.", "Terms of Service", JOptionPane.ERROR_MESSAGE);
} else {
    this.dispose();
    JOptionPane.showMessageDialog(null,"Thank you. We will now move on to registering your product.");
}

结果：

随后是

编辑2

尝试下面的代码，它应该显示一个框架，当您单击“关闭”按钮时，它应该显示一个对话框，这是您正在寻找的吗？

import javax.swing.*;
import java.awt.event.*;

class FrameDemo {
    public static void main( String [] args ) {
        final JFrame frame = new JFrame("Main frame");
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.add( new JPanel(){{
            add( new JLabel("This is the main content"));
            add( new JButton("Close"){{
                addActionListener( new ActionListener(){
                    public void actionPerformed(ActionEvent e ) {
                        frame.dispose();
                        JOptionPane.showMessageDialog(frame,"IT WORKS!");

                    }
                });
            }});
        }});
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible( true );

    }
}

Answer 2

我知道这可能是一个愚蠢的答案，但有时最明显的事情会引起问题。我没有看到你在代码中导入 javax.swing...你这样做了吗？