Удаление JComponents/JTextFields от JPanel которого ссылка хранятся в ArrayList <JTextField>

Question

ArrayList<JTextField> arrayFinal; /* 
            LIKE global variable 
        Have initialize part, for alloc memory for arayFinal. 
         */ 

Кроме того, есть часть, где добавить к панели, JTextFields от arrayFinal. И теперь в этой функции, не может удалить из панели, что элементы ...

public void arrayFinalErase(JPanel panel){ 

     for (JTextField text : arrayFinal){ 
      panel.remove(text); 
     } 
     panel.revalidate(); 
     panel.repaint(); 

     /* 
     * Also tried 
     * panel.remove(arrayFinal.get(......)); 
     * but also doesn't work 
     */ 
    } 

EDIT, вставьте полный код:

JButton dodajButton = new JButton("Dodaj"); 
    dodajButton.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent arg0) { 

      System.out.println("--------\n TEXT: " + arrayFinal.get(0).getText()); 
      panel.remove(arrayFinal.get(0)); 

      panel.revalidate(); 
      panel.repaint(); 

     } 
    }); 
    dodajButton.setBounds(851, 35, 89, 23); 
    panel.add(dodajButton); 

    JButton sacuvajButton = new JButton("Sacuvaj"); 
    sacuvajButton.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 

      try { 
       sacuvajArray(); 
      } catch (SQLException e1) { 
       // TODO Auto-generated catch block 
       e1.printStackTrace(); 
      } 

     } 
    }); 
    sacuvajButton.setBounds(851, 7, 89, 23); 
    panel.add(sacuvajButton); 



    scrollPane.setBounds(10, 11, 969, 400); 
    scrollPane.setBackground(Color.green); 

    contentPane.add(scrollPane); 


    countRows = count(ID); 
    if (countRows!= 0){ 
     setBeginning(); 

     for(ArrayList<JTextField> tmp : list){ 
      textDrawWithArray(tmp, panel); 
     } 
    } 
    else{ 
     System.out.println("dadada"); 
     textDrawDefault(panel); 
     finalDraw(panel); 

    } 



} 

public int count(int ID) throws SQLException{ 

    String sql = "SELECT COUNT(ID) AS total FROM tabelle_1 WHERE ID = " + ID + ";"; 
    ResultSet rs = stmt.executeQuery(sql); 

    return rs.getInt(1); 
} 

public void setBeginning() throws SQLException{ 


    String sql = "SELECT * FROM tabelle_1 WHERE ID =" + ID + ";"; 
    ResultSet rs = stmt.executeQuery(sql); 


    if (rs.next()){ 

     ArrayList<JTextField> tmp; 
     do{ 
      tmp = arrayAllocJTextField(); 

      tmp.add(textAlloc(rs.getString("datum"))); 
      tmp.add(textAlloc(Double.toString(rs.getDouble("cena")))); 
      tmp.add(textAlloc(Double.toString(rs.getDouble("brojLekcija")))); 
      tmp.add(textAlloc(Double.toString(rs.getDouble("total")))); 
      tmp.add(textAlloc(rs.getString("opisRadnje"))); 
      tmp.add(textAlloc(rs.getString("cena_1"))); 
      tmp.add(textAlloc(rs.getString("brojLekcija_1"))); 
      tmp.add(textAlloc(rs.getString("total_1"))); 

      list.add(tmp); 




     }while(rs.next()); 

    } 


    rs.close(); 

} 

public ArrayList<String> arrayAllocString(){ 
    return new ArrayList<String>(); 
} 

public ArrayList<JTextField> arrayAllocJTextField(){ 
    return new ArrayList<JTextField>(); 
} 

public JTextField textAlloc(String text){ 
    return new JTextField(text); 
} 

public void textDrawWithArray(ArrayList<JTextField> array, JPanel panel){ 

    JTextField textTemp; 


    int i = 1; 
    for(JTextField text : array){ 

     if (i == 1){ 

      textTemp = textAlloc(Integer.toString(redniBroj)); 
      textTemp.setColumns(10); 
      textTemp.setBounds(x_pos[0], y_pos, x_duz[0], y_duz); 
      textTemp.setEditable(false); 

      panel.add(textTemp); 
      redniBroj++; 
     } 

     textTemp = textAlloc(text.getText()); 
     textTemp.setColumns(10); 
     textTemp.setBounds(x_pos[i], y_pos, x_duz[i], y_duz); 

     panel.add(textTemp); 
     i++; 
    } 

    panel.revalidate(); 
    panel.repaint(); 
    y_pos += 30; 
} 

public void textDrawDefault(JPanel panel){ 

    JTextField textTemp; 
    ArrayList<JTextField> tmp = arrayAllocJTextField(); 

    for (int i = 0; i < 9; i++){ 

     if (i == 0){ 
      textTemp = textAlloc(Integer.toString(redniBroj)); 
      textTemp.setColumns(10); 
      textTemp.setBounds(x_pos[i], y_pos, x_duz[i], y_duz); 
      textTemp.setEditable(false); 

      panel.add(textTemp); 
      redniBroj++; 

      continue; 
     }else if (i == 4 || i == 8){ 
      textTemp = textAlloc(""); 
      textTemp.setEditable(false); 
      textTemp.setColumns(10); 
      textTemp.setBounds(x_pos[i], y_pos, x_duz[i], y_duz); 

      tmp.add(textTemp); 

      if (i == 4){ 
      textTemp.addFocusListener(new FocusListener(){ 

       @Override 
       public void focusGained(FocusEvent arg0) { 
         if (!tmp.get(1).getText().equals("") && !tmp.get(2).getText().equals("")){ 
         double a = Double.parseDouble(tmp.get(1).getText()); 
         double b = Double.parseDouble(tmp.get(2).getText()); 

         tmp.get(3).setText("" + (a*b)); 
         } 


       } 

       @Override 
       public void focusLost(FocusEvent arg0) { 
        // TODO Auto-generated method stub 

       } 

      }); 

      }else{ 
       textTemp.addFocusListener(new FocusListener(){ 

        @Override 
        public void focusGained(FocusEvent arg0) { 

         if (!tmp.get(5).getText().equals("") && !tmp.get(6).getText().equals("")){ 
           double a = Double.parseDouble(tmp.get(5).getText()); 
           double b = Double.parseDouble(tmp.get(6).getText()); 

           tmp.get(7).setText("" + (a*b)); 
         } 

        } 

        @Override 
        public void focusLost(FocusEvent arg0) { 
         // TODO Auto-generated method stub 

        } 

       }); 
      } 

      panel.add(textTemp); 
      continue; 

     } 

     textTemp = textAlloc(""); 
     textTemp.setColumns(10); 
     textTemp.setBounds(x_pos[i], y_pos, x_duz[i], y_duz); 
     textTemp.setText(""); 

     panel.add(textTemp); 
     tmp.add(textTemp); 

    } 

    list.add(tmp); 
    panel.revalidate(); 
    panel.repaint(); 
    y_pos += 30; 
    System.out.println("cechk default"); 

} 


public void sacuvajArray() throws SQLException{ 

    String[] textBase = new String[8]; 

    String sqlDelete = "DELETE FROM tabelle_1 WHERE ID = "+ ID + ";"; 
    stmt.executeUpdate(sqlDelete); 

    String sqlInsert; 

    int i = 0; 
    for(ArrayList<JTextField> arrayChild : list){ 

     i= 0; 

     for(JTextField text : arrayChild){ 
      textBase[i++] = text.getText(); 

     } 
     sqlInsert = "INSERT INTO tabelle_1 (ID, datum, cena, brojLekcija, total, opisRadnje, cena_1, brojLekcija_1, total_1) VALUES(" 
       + ID + "," 
       + "'" + textBase[0] + "'," 
       + "'" + textBase[1] + "'," 
       + "'" + textBase[2] + "'," 
       + "'" + textBase[3] + "'," 
       + "'" + textBase[4] + "'," 
       + "'" + textBase[5] + "'," 
       + "'" + textBase[6] + "'," 
       + "'" + textBase[7] + "');"; 

     stmt.executeUpdate(sqlInsert); 

    } 

} 

public void finalDraw(JPanel panel){ 

    double brojLekcija=0.0; 
    double total= 0.0; 

    double cena_1=0.0; 
    double brojLekcija_1=0.0; 
    double total_1= 0.0; 
    int i = 0, y=0; 

    for(ArrayList<JTextField> tmp : list){ 
     i=0; 
     for(JTextField textField : tmp){ 

      if (i == 0 || i == 1 || i == 4){ 
       i++; 
       continue; 
      } 


      String text = textField.getText(); 
      if (text.equals("")){ 

       i++; 
       continue; 
      } 

      switch(i){ 
      case 2: 
       brojLekcija += Double.parseDouble(text); 
       break; 
      case 3: 
       total += Double.parseDouble(text); 
       break; 
      case 5: 
       cena_1 += Double.parseDouble(text); 
       break; 
      case 6: 
       brojLekcija_1 += Double.parseDouble(text); 
       break; 
      case 7: 
       total_1 += Double.parseDouble(text); 
       break; 
      default: 
       System.out.println("ERROR!!"); 
       break; 
      } 

      i++; 

     } 
     System.out.println("-----------------"); 
    } 

    arrayFinal.add(textAlloc("Total")); 
    arrayFinal.add(textAlloc("")); 
    arrayFinal.add(textAlloc(Double.toString(brojLekcija))); 
    arrayFinal.add(textAlloc(Double.toString(total))); 
    arrayFinal.add(textAlloc("")); 
    arrayFinal.add(textAlloc(Double.toString(cena_1))); 
    arrayFinal.add(textAlloc(Double.toString(brojLekcija_1))); 
    arrayFinal.add(textAlloc(Double.toString(total_1))); 

    textDrawWithArray(arrayFinal, panel); 
    System.out.println("OKE JE"); 

} 

public void arrayFinalErase(JPanel panel){ 

    for (JTextField text : arrayFinal){ 
     panel.remove(text); 
    } 
    panel.revalidate(); 
    panel.repaint(); 

    /* 
    * Also tried 
    * panel.remove(arrayFinal.get(......)); 
    * but also doesn't work 
    */ 

    y_pos -= 30; 
} 

}

Answer 1

Он отлично работает для меня:

import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import java.util.List; 

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

public class FrameExample extends JFrame implements ActionListener { 

    private static final long serialVersionUID = 1L; 
    private List<JTextField> textfieldGroup; 

    public FrameExample() { 
     setSize(800, 600); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setLayout(new FlowLayout()); 

     textfieldGroup = new ArrayList<>(); 

     init(); 
     pack(); 
     setVisible(true); 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     arrayFinalErase(); 
    } 

    private void init() { 
     for (int index = 0; index < 10; index++) { 
      textfieldGroup.add(new JTextField(index)); 
      add(textfieldGroup.get(index)); 
     } 
     JButton removeAllTextfields = new JButton("remove"); 
     add(removeAllTextfields); 
     removeAllTextfields.addActionListener(this); 
    } 

    private void arrayFinalErase() { 

     for (JTextField text : textfieldGroup) { 
      remove(text); 
     } 
     revalidate(); 
     repaint(); 

    } 

    public static void main(String[] args) { 
     new FrameExample(); 
    } 

} 

Возможно, ваш список текстовых полей пуст?