java - 为什么我的窗口不显示？

Question

刚刚完成编码，但由于某种原因，当我运行它时，我的窗口根本不显示!有人有什么想法吗？

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

public class RetailPriceCalculator extends JFrame
{
private InputPanel inputs;
private OutputPanel outputs;
private ExplanationPanel banner;
private JPanel buttonPanel;
private JButton calcButton;
private JButton exitButton;

public void RetailPriceCalculatorGUI()
{
    setTitle("Retail Price Calculator");

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    setLayout(new BorderLayout());

    banner = new ExplanationPanel();
    inputs = new InputPanel();
    outputs = new OutputPanel();

    buildButtonPanel();

    add(banner, BorderLayout.NORTH);
    add(inputs, BorderLayout.WEST);
    add(outputs, BorderLayout.EAST);
    add(buttonPanel, BorderLayout.SOUTH);

    pack();
    setVisible(true);
}

public void buildButtonPanel()
{
    buttonPanel = new JPanel();

    calcButton = new JButton("Calculate");
    exitButton = new JButton("Exit");

    calcButton.addActionListener(new CalcButtonListener());
    exitButton.addActionListener(new ExitButtonListener());

    buttonPanel.add(calcButton);
    buttonPanel.add(exitButton);
}

private class CalcButtonListener implements ActionListener
{
    public void actionPerformed (ActionEvent e)
    {
        double wholesale, markup, retail;

        wholesale = inputs.getWholesale();
        markup = inputs.getMarkup();

        retail = wholesale * (1 + markup);

        outputs.setRetail(retail);
    }
}

private class ExitButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        System.exit(0);
    }
}

public static void main(String[] args)
    {
        new RetailPriceCalculator();
    } 

}

ExplanationPanel()、InputPanel() 和 OutputPanel() 类很简单，不应妨碍代码。我只是运行它，然后它突然说它已终止，根本没有窗口!连个空框都没有!

Answer 1

您似乎在 RetailPriceCalculator 方法中有拼写错误。

将 public void RetailPriceCalculatorGUI() 更改为构造函数 public RetailPriceCalculator()

或将您的主要方法更新为:

new RetailPriceCalculator().RetailPriceCalculatorGUI();