小编Joe*_*roo的帖子

我已经检查了无处可修复但没有任何方法可以使我的复选框出现.我将它添加到面板并将面板添加到窗口.按钮出现所以它必须是复选框的问题.这是我的代码:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainApplication {

    public static Toolkit tk = Toolkit.getDefaultToolkit();

    public static void main(String[] args) {
        MainApplication instance = new MainApplication();
        instance.start();
    }

    private JFrame window;
    private JPanel mainPanel;
    private JPanel contingencyPanel;

    private JButton applyButton = new JButton("Apply Changes");
    private JCheckBox autoRedLightBox = new JCheckBox("Red Light");
    private JCheckBox autoYellowLightBox = new JCheckBox("Yellow Light");
    private JCheckBox autoGreenLightBox = new JCheckBox("Green Light");
    private …