Question

我一直在努力解决这个问题。请参阅下面的代码。我试图将HighscorePaneel添加到大型机。我已经制作了highscorePaneel和mainFrame。但行

        mainFrame.add(highscorePaneel);

在eclipse中给出错误＆＃34; mainFrame无法解析＆＃34;而且我不知道为什么。

你能告诉我我做错了什么吗？

package lunarlockout;

public class LunarLockoutApp
{
    public static void main(String[] args)
    {
        Mainframe mainFrame = new Mainframe();
    }
}

第二课（删除了一些不需要发布的代码）

package lunarlockout;

public class Mainframe extends JFrame   {

    public  Mainframe(){
        setSize(1200, 800);
        setTitle("Lunar Lockout!");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    HoofdmenuPaneel hoofdmenuPaneel = new HoofdmenuPaneel();
    add(hoofdmenuPaneel);

    setVisible(true);
    }
}

第三类

public class HighscorePaneel extends JPanel implements ActionListener {

public HighscorePaneel(){

    setLayout(null);
    setSize(330, 528);
    setLocation(461, 137);
    setBackground( new Color(255, 255, 255, 25) );
    setVisible(true);
}

和我的上一堂课，有错误的那门：

package lunarlockout;

public class HighscoreInzien {

    Mainframe mainFrame;

public HighscoreInzien(Mainframe mainFrame) {
    this.mainFrame = mainFrame;
}

public void run() {

    HighscorePaneel highscorePaneel = new HighscorePaneel();
    mainFrame.add(highscorePaneel);

    throw new UnsupportedOperationException();
    }
}

HoofdmenuPaneel类

public class HoofdmenuPaneel extends JPanel implements ActionListener {

private JButton selecteerLevelButton;
private JButton spelHervattenButton;
private JButton highscoresButton;
private JButton afsluitenButton;

public HoofdmenuPaneel(Mainframe mainFrame){
    this.mainFrame = mainFrame;

    setLayout(null);

    setSize(330, 528);
    setLocation(461, 137);
    setBackground( new Color(255, 255, 255, 25) );

    public void actionPerformed(ActionEvent e) {

    if (e.getSource() == selecteerLevelButton)
    {
        System.out.println("selecteerLevelButton");
    }
    else if(e.getSource() == spelHervattenButton)
    {
        System.out.println("spelHervattenButton");
    }
    else if(e.getSource() == highscoresButton)
    {   
        this.hide();
        HighscoreInzien highscoreInzienTask = new HighscoreInzien(mainFrame);
        highscoreInzienTask.run();

    }
}

Answer 1

将Mainframe对象传递给HighscoreInzien类。

这样做：

public class HighscoreInzien {

    Mainframe mainFrame;

    public HighscoreInzien(Mainframe mainFrame) {
        this.mainFrame = mainFrame;
    }

    ...
}

public class HoofdmenuPaneel extends JPanel implements ActionListener {

    Mainframe mainFrame;
    public HoofdmenuPaneel(Mainframe mainFrame){
        this.mainFrame = mainFrame;
        ...
    }
}

public class Mainframe extends JFrame   {

    public  Mainframe(){
       ...

       HoofdmenuPaneel hoofdmenuPaneel = new HoofdmenuPaneel(this);
       ...
    }
}

似乎无法将一个面板添加到另一个类的框架中

1 个答案: