的JComboBox在JTable中

Question

我有一個JComboBox，JTable中的第3和第4列，但我不知道如何得到它的項目...問題是沒有方法來獲取項目，但劇組

JComboBox combo=(JComboBox) jTable1.getColumnModel().getColumn(3).getCellEditor(); 

你能幫助我嗎？

Answer 1

該JComboBox包裹在CellEditor。使用DefaultCellEditor時，您必須檢索包裹組件，例如：

DefaultCellEditor editor = (DefaultCellEditor)table.getColumnModel().getColumn(3).getCellEditor(); 
JComboBox combo = (JComboBox)editor.getComponent(); 

Answer 2

閱讀本教程，瞭解如何在JTable中使用JCombobox作爲編輯器。
http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#combobox

Answer 3

嘗試這樣：

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; 
     } 
    }