jtable裏面的動態jcombobox物品

Question

我試圖用兩個組合框在每一行中創建一個Jtable。我檢查了教程，發現我可以在組合框中添加靜態數據。但是，我怎樣才能將動態數據加載到組合框中。即使每當用戶從該行中選擇組合框1，那麼基於該組合框2，組合框2將被更新。

任何人可以幫助我在這？

如果我從組合框中輸入removeAllItems()，那麼組合框2會更新，但我無法添加新條目。

在此先感謝。

Answer 1

表中有兩列都呈現爲JComboBox.現在，選擇列-2項目取決於列-1選擇。

import java.awt.Component; 
import java.awt.EventQueue; 
import java.util.ArrayList; 
import java.util.List; 

import javax.swing.DefaultCellEditor; 
import javax.swing.DefaultComboBoxModel; 
import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 


public class ComboBoxExample { 

    private void createUI() { 

     JFrame frame = new JFrame(); 

     Object[] columNames = {"Combo-1", "Combo-2"}; 
     Object[][] data = {{"", ""}, {"", ""}, {"", ""}, {"", ""}}; 

     JTable table = new JTable(data, columNames); 

     table.getColumnModel().getColumn(0).setCellEditor(new CustomComboBoxEditor()); 
     table.getColumnModel().getColumn(1).setCellEditor(new CustomComboBoxEditor()); 

     frame.add(new JScrollPane(table)); 
     frame.setTitle("Column -2 based on Column - 1 ComboBox Selection."); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     Runnable r = new Runnable() { 

      @Override 
      public void run() { 
       new ComboBoxExample().createUI(); 
      } 
     }; 

     EventQueue.invokeLater(r); 
    } 

} 

class CustomComboBoxEditor extends DefaultCellEditor { 

    // Declare a model that is used for adding the elements to the `ComboBox` 
    private DefaultComboBoxModel model; 

    private List<String> obtainedList; 

    public CustomComboBoxEditor() { 
     super(new JComboBox()); 
     this.model = (DefaultComboBoxModel)((JComboBox)getComponent()).getModel(); 
     obtainedList = new ArrayList<String>(); 

     obtainedList.add("One"); 
     obtainedList.add("Two"); 
     obtainedList.add("Three"); 
     obtainedList.add("Four"); 
     obtainedList.add("Five"); 
    } 

    @Override 
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) { 


     if(column == 0) { 
      model.removeAllElements(); 
      for(int i = 0; i < obtainedList.size(); i++) { 
       model.addElement(obtainedList.get(i)); 
      } 
     } else { 

      model.removeAllElements(); 
      String selectedItem = (String) table.getValueAt(row, 0); 
      for(int i = 0; i < obtainedList.size(); i++) { 
        if(!selectedItem.equals(obtainedList.get(i))) 
        model.addElement(obtainedList.get(i)); 
      } 
     } // Close else 

     return super.getTableCellEditorComponent(table, value, isSelected, row, column); 
    } 
    } 

Answer 2

嘗試這樣的事情，你可以改變數據在這個例子中，並重新粉刷，做電池的渲染：

public void example(){ 

     TableColumn tmpColum =table.getColumnModel().getColumn(1); 
     String[] DATA = { "Data 1", "Data 2", "Data 3", "Data 4" }; 
     JComboBox comboBox = new JComboBox(DATA); 

     DefaultCellEditor defaultCellEditor=new DefaultCellEditor(comboBox); 
     tmpColum.setCellEditor(defaultCellEditor); 
     tmpColum.setCellRenderer(new CheckBoxCellRenderer(comboBox)); 
     table.repaint(); 
    } 


/** 
    Custom class for adding elements in the JComboBox. 
*/ 
class CheckBoxCellRenderer implements TableCellRenderer { 
     JComboBox combo; 
     public CheckBoxCellRenderer(JComboBox comboBox) { 
      this.combo = new JComboBox(); 
      for (int i=0; i<comboBox.getItemCount(); i++){ 
       combo.addItem(comboBox.getItemAt(i)); 
      } 
     } 
     public Component getTableCellRendererComponent(JTable jtable, Object value, boolean isSelected, boolean hasFocus, int row, int column) { 
      combo.setSelectedItem(value); 
      return combo; 
     } 
    } 

Answer 3

後removeAllItems（）調用，添加項目在組合框作爲

combobox.addItem("one"); 
    combobox.addItem("two");