沒有為add（）找到合適的方法

Question

我正在為朋友在NetBeans中開發一個Java應用程序。 這是代碼：

public class ReportGenerator extends JFrame implements ActionListener {
//GUI components
private JMenuBar menuBar;
private JMenu fileMenu;
private JMenuItem newItem;
    private JMenuItem openItem;
    private JMenuItem exitItem;

private ReportGeneratorSetup setup;
private ReportGeneratorProgram application;

public ReportGenerator()
{
    menuBar = new JMenuBar();
    fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    exitItem = new JMenuItem("Exit");
    fileMenu.add(exitItem);
    exitItem.addActionListener(this);
    menuBar.add(fileMenu);
    this.setJMenuBar(menuBar);
    this.setSize(1000,1200);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);

    setup = new ReportGeneratorSetup(this);
    application = new ReportGeneratorProgram(this,setup);

    //this.add(setup);  
    this.validate();
}

public static void main(String[] args) {

    ReportGenerator rg = new ReportGenerator();
}  
public void switchToPanel(String panel)
{
    this.getContentPane().removeAll();

    if(panel.equals("Eval"))
    {
                    application.setupComponents();
        this.getContentPane().add(application);

    }
    else if(panel.equals("Setup"))
    {
        this.getContentPane().add(setup);
    }

    this.invalidate();
    this.validate();
}

@Override
public void actionPerformed(ActionEvent arg0)
{
    if(arg0.getSource() instanceof JMenuItem)
    {
        JMenuItem item = (JMenuItem)arg0.getSource();

        if(item.getText().equals("Exit"))
        {
            dispose();
            System.exit(0);
        }
    }
}

}

我收到的錯誤是：

no suitable method found for add(reportgenerator.ReportGeneratorSetup)
    method java.awt.Container.add(java.awt.Component,java.lang.Object,int) is not applicable
      (actual and formal argument lists differ in length)
    method java.awt.Container.add(java.awt.Component,java.lang.Object) is not applicable
      (actual and formal argument lists differ in length)
    method java.awt.Container.add(java.awt.Component,int) is not applicable
      (actual and formal argument lists differ in length)
    method java.awt.Container.add(java.lang.String,java.awt.Component) is not applicable
      (actual and formal argument lists differ in length)
    method java.awt.Container.add(java.awt.Component) is not applicable
      (actual argument reportgenerator.ReportGeneratorSetup cannot be converted to java.awt.Component by method invocation conversion)
    method java.awt.Component.add(java.awt.PopupMenu) is not applicable
      (actual argument reportgenerator.ReportGeneratorSetup cannot be converted to java.awt.PopupMenu by method invocation conversion)

誰能告訴我為什么會發生這種情況？ 這將不勝感激。

Answer 1

您的類ReportGeneratorSetup需要是某種組件，很可能需要擴展JPanel或JComponent 。