java.lang.IllegalArgumentException добавления окна в контейнер

Question

Я постоянно получаю эту ошибку

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"); 
    } 

    }*/ 
    } 

и мой класс CustomerOrder

 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); 

    } 



} 



} 

Когда я запускаю этот код я получаю следующее исключение из основной класс в customerorder = новый CustomerOrder; mainPanel.add (CustomerOrder, "CustomerOrder")

Answer 1

customorder является экземпляром CustomerOrder, который простирается от JFrame; public class CustomerOrder extends JFrame

При обнаружении ошибки illegalargumentexception adding a window to a container; незаконно добавлять окно в другое окно, это просто не имеет смысла.

Это одна из причин, по которой мы препятствуем распространению непосредственно из контейнеров верхнего уровня, таких как JFrame.

Либо сделать CustomerOrder видимым как любой нормальный кадр (хотя это может привести вас к другим вопросам) или еще лучше, основывают свой CustomerOrder составляющую JPanel

public class CustomerOrder extends JPanel { 
    //... 
} 

Таким образом, вы можете добавить его к тому, что когда-либо контейнер, который вам нужно.