java.lang.IllegalArgumentException异常将窗口添加到容器

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我不断收到此错误

    import javax.swing.*; 
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import javax.swing.table.*;
    import java.awt.Container.*;

     public class main extends JFrame implements ActionListener
    



    JButton CustomerOrder;
    JButton SoftwareProducts;
    JButton BooksProducts;
    JButton AddBooks;
    JButton StaffMember;
    JButton LoginView;


    static ArrayList<Software> softwareList = new ArrayList<Software>();

    CardLayout c1 = new CardLayout();


    JPanel mainPanel;
    SoftwareProducts addsoftware;

    CustomerOrder customerorder;

    BooksProducts addProduct;

    AddBooks addBook;

    SoftwareProducts sf = new SoftwareProducts();

    //Press submit;

    public static void main(String[] args)
   

    new main();
    JFrame frame = new JFrame("Selling Product");
    frame.setLocationRelativeTo(null);
    //frame.getContentPane().add(main, BorderLayout.CENTER);
    //new CustomerOrder();
    //EmailFrame email=new EmailFrame();
    //CustomerOrder co = new CustomerOrder();
    //LoginView login = new LoginView();

  

public main()

    super();




  // getContentPane().setBackground(Color.green);





   setSize(700,800);
   setLayout(new FlowLayout());

     /*CardLayout cardLayout = (CardLayout) mainPanel.getLayout();
     cardLayout.show(mainPanel, "softwareProducts");
     */


   //CustomerOrder co = new CustomerOrder();
   //add(co);



   SoftwareProducts = new JButton("SoftwareProducts");
   SoftwareProducts.setSize(150,40);
   SoftwareProducts.setLocation(20,50);


   CustomerOrder = new JButton("CustomerOrder");
   CustomerOrder.setSize(160,40);
   CustomerOrder.setLocation(150,50);



   BooksProducts = new JButton("BooksProducts");
   BooksProducts.setSize(200,40);
   BooksProducts.setLocation(310,50);


   AddBooks = new JButton("AddBook");
   AddBooks.setSize(200,40);
   AddBooks.setLocation(310,50);


   StaffMember = new JButton("StaffMember");
   StaffMember.setSize(200,40);
   StaffMember.setLocation(310,50);


   LoginView = new JButton("LoginView");
   LoginView.setSize(150,40);
   LoginView.setLocation(20,50);


   SoftwareProducts.addActionListener(this);

   add(SoftwareProducts);

   CustomerOrder.addActionListener(this);

   add(CustomerOrder);

   BooksProducts.addActionListener(this);

   add(BooksProducts);

   AddBooks.addActionListener(this);

   add(AddBooks);


   StaffMember.addActionListener(this);

   add(StaffMember);




   mainPanel = new JPanel();
   mainPanel.setBackground(Color.BLUE);
   mainPanel.setPreferredSize(new Dimension(600,500));
   mainPanel.setLayout(c1);







   addsoftware = new SoftwareProducts();
   mainPanel.add(addsoftware,"addsoftware");


   customerorder = new CustomerOrder();  ////// I am getting the error
        from this part of code  
   mainPanel.add(customerorder,"customerorder");///// I am getting the     
         error from this part of code  

   addProduct = new BooksProducts();
   mainPanel.add(addProduct,"addProduct");


   addBook = new AddBooks();
   mainPanel.add(addBook,"addBook");



  /*  mainPanel.add(SoftwareProducts);

     mainPanel = new JPanel(new CardLayout());

     mainPanel.add(SoftwareProducts);

     getContentPane().add(mainPanel);


     addProduct = new BooksProducts();
     mainPanel.add(addProduct,"addProduct");


    */




      add(mainPanel);






       setVisible(true);






public void actionPerformed(ActionEvent e)


   if(e.getSource() == SoftwareProducts)
   

    c1.show(mainPanel,"addsoftware");
    this.setTitle("SoftwareProducts");
    //System.out.println("Softwares");
    


    if(e.getSource() == CustomerOrder)
   

    c1.show(mainPanel,"customerorder");
    this.setTitle("CustomerOrder");
    //System.out.println("Custmers");
    


     if(e.getSource() == BooksProducts)
   

     c1.show(mainPanel,"addProduct");
     this.setTitle("BooksProducts");
    

    if(e.getSource() == AddBooks)
   

     c1.show(mainPanel,"addBook");
     this.setTitle("AddBooks");
    

   if(e.getSource() == LoginView)
   

     c1.show(mainPanel,"LogIN");
     this.setTitle("LOGIN");
    



      /*  public void actionPerformed(ActionEvent e)
        
      if(e.getSource() == press)
 

    System.out.println("addProducts");
    

   */

我customerOrder类

      import javax.swing.*;
      import javax.swing.table.*; 
      import java.awt.*;
      import java.awt.event.*;
      import java.util.Arrays; 
      import java.util.ArrayList;
      import java.util.Collections;
      import java.util.List;
      import java.util.*;
      import java.io.*;
       public class CustomerOrder extends JFrame 
     implements  ActionListener 

  

//JButton asd = new JButton("BUTTON");
//JTextField productID;
//JTextField productName;
//JTextField productCost;
//JTextField productPYear;
//JTextField productPHouse;

JButton showOrder;


DefaultListModel<String> model = new DefaultListModel<>();
JList <String>orderList = new JList(model);
JTable softwareTabel = new JTable();


//DefaultTableModel tableModel = new DefaultTableModel(0, 1);


public CustomerOrder()


    //super();

   // JLabel toLabel=new JLabel("Product ID: ");
    //JTextField to=new JTextField();


    setLayout(new FlowLayout());


   /* 
    productName = new JTextField(12);
    add(productName);

    productCost = new JTextField(12);
    add(productCost);

    productPYear = new JTextField(12);
    add(productPYear);


    productPHouse = new JTextField(12);
    add(productPHouse);

    */
    showOrder = new JButton("SHOW ORDER");
    showOrder.setSize(25,40);
    showOrder.addActionListener(this);
    add(showOrder); 








public void actionPerformed(ActionEvent e)


    //Object[] colNames="Product ID","Processor","RAm";
    if(e.getSource() == showOrder)
      
         model.removeAllElements();

       /*  GridLayout exLayout = new GridLayout(3, 3);

         JLabel ram,processor; 

         ram = new JLabel("RAM");
         processor = new JLabel("Processor");
         String softwaredata[] = "ID","RAM","Processor","Product ID","Product Name","Product Year","Product Year","Product PublishHouse";

         JPanel panel = new JPanel();
         panel.setLayout(new GridLayout(8,   3));

         add(ram);
         add(processor);

         JTable table = new JTable();*/
         //DeafultTableModel dm = new DeafultTableModel(0,0);
          //String header[] = new String[] "RAM", "Processor","ProductID","Product Name","Product Year","Product Publish House"; 
          //dm.setColumnIdentifiers(header);
          //Object[][] software = new Object[8][3];

          //model.addRow(orderList.toArray());



          int x = 0;
       while (x < main.softwareList.size())
        
            //./model.addElement(main.softwareList.get(x).getproductYear());
             model.addElement(""+main.softwareList.get(x).getproductID());
             model.addElement(""+main.softwareList.get(x).getRam());
             model.addElement(""+ main.softwareList.get(x).getProcessor());
             model.addElement(""+ main.softwareList.get(x).getproductID()); 
             model.addElement(main.softwareList.get(x).getproductName());
             model.addElement(""+ main.softwareList.get(x).getproductYear());
             model.addElement(main.softwareList.get(x).getproductPublishHouse());
             //model.addElement(main.softwareList.get(x).getproductID());*/              

             x++;

          //System.out.println("as");


        
          /* ArrayList<String> table1 = new ArrayList();

          ArrayList<ArrayList<String>> table2 = new ArrayList();
          table1.add("Product ID");
          table1.add("RAM");
          table1.add("Processor");
          table1.add("Product Name");
          table1.add("Product Year");
          table1.add("Product PHouse");

          Object[] software = table1.toArray();
          String[] [] softwarest = new String[table1.size()][];

          int i = 0;
          for (List<String> next : table2)

             softwarest[i++] = next.toArray(new String[next.size()]);
            



            JTable newTable = new JTable(softwarest,software);

            JFrame frame = new JFrame();
            frame.getContentPane().add(new JScrollPane(newTable));
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            */
             //table.add(model);

         // add(orderList);
        //Object[] column = "RAM:", "Processor:";
        //Object[][] data = "RAM:", "Processor:";
        //JTable table = new JTable();
        //table.setShowGrid(false);
        //table.setTableHeader(null);

当我运行此代码我收到来自customerorder =新CustomerOrder主类下面的异常; mainPanel.add（customerorder “customerorder”）

答案

customorder是CustomerOrder，它从JFrame延伸的一个实例; public class CustomerOrder extends JFrame

由于错误状态illegalargumentexception adding a window to a container;它是非法的一个窗口添加到另一个窗口，它根本就没有意义。

这也是我们不鼓励从顶层容器直接延伸喜欢JFrame的原因之一。

要么让CustomerOrder就像任何普通的帧可见（尽管可能导致你到其他的问题），或者更好的是，基地CustomerOrder您JPanel组件

public class CustomerOrder extends JPanel 
    //...

这样，您就可以将其添加到什么都容器需要。

另一答案

IDK如果这个逻辑是正确的，但只是在玩周围试图找出它没有意义了自己的原因，我的结论是：

  • 延长JFrame原因只有一个被创建的对象，并从而导致该异常为什么它试图将JFrame frame;对象添加到自己...
  • 延伸JPanel允许JFrame框架; frame.add(this) ..

frame.add(this)是通过JPanel方法.add()调用的组件

如果这是错误的PLZ正确..

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