我是Java编程的初学者。我想使用 JComboBox 作为 JTable 中的单元格编辑器。但是我想将 JCombobox 的选定索引设置为单击以进行编辑时单元格的当前值的值。我怎么能做到这一点？
我用于单元格以及 Jcombobox 项目的类：
public class PersianLetterIDPair {
private int id;
private String letter;
public PersianLetterIDPair(int id, String description)
{
this.id = id;
this.letter = description;
}
public int getID()
{
return id;
}
public String getLetter()
{
return letter;
}
public void setID(int inID)
{
id = inID;
}
public void setLetter(String inLetter)
{
letter = inLetter;
}
public String toString()
{
return letter;
}
}
我填写 Jcombobox 的方式：
Vector<PersianLetterIDPair> model2 = new Vector<PersianLetterIDPair>();
model1 = myDBLayer
.getVectorPersianLettersIDContent();
int tPLID;
String tPL;
Iterator iterator = model1.iterator();
while (iterator.hasNext()) {
Vector newRow = new Vector();
newRow = (Vector) iterator.next();
tPLID = (Integer) newRow.get(0);
tPL = (String) newRow.get(1);
model2.addElement(new PersianLetterIDPair(tPLID,
tPL));
}
PersianLetters0001 = new JComboBox(model2);
jTable2.getColumnModel().getColumn(0).setCellEditor(new DefaultCellEditor(PersianLetters0001));
我为我的 Jtable 使用了一个表模型，如下所示：
public class FormSimilaritiesTableModel extends AbstractTableModel {
private DBLayer myDBLayer = new DBLayer();
private ResultSet rs;
private String colNames[];
private Vector<FormSimilarityRow> allRows;
private FormSimilarityRow row;
private Vector<FormSimilarityRow> newRow;
private int li_cols;
private String tableName;
private ResultSetMetaData myM;
private Vector<FormSimilarityRow> deletedKeys;
private Vector newRows;
private Vector updatedRows;
private boolean ibRowInserted = false;
private guiBaseTables myGuiBaseTables ;
boolean ibRowNew = false;
FormSimilaritiesTableModel() {
deletedKeys = new Vector();
newRows = new Vector();
updatedRows = new Vector();
try {
ResultSet rs = myDBLayer.getrsFormSimilarities();
li_cols = 3 ;
colNames = new String[li_cols];
colNames[0] = "Persian Letter 1";
colNames[1] = "Persian Letter 2";
colNames[2] = "Form Similarity";
allRows = new Vector<FormSimilarityRow>();
int rPLID1;
String rPL1;
int rPLID2;
String rPL2;
while (rs.next()) {
///newRow = new Vector();
rPLID1 = (Integer) rs.getObject(1);
rPL1 = (String) rs.getObject(2);
rPLID2 = (Integer) rs.getObject(3);
rPL2 = (String) rs.getObject(4);
allRows.addElement(new FormSimilarityRow(new PersianLetterIDPair(rPLID1, rPL1),new PersianLetterIDPair(rPLID2, rPL2), (Integer)rs.getObject(5)));
} // while
} catch (SQLException e) {
System.out.println(e.getMessage());
}
}
public Class getColumnClass(int col) {
if (col == 0 || col == 1) {
return PersianLetterIDPair.class;
} else if (col == 2) {
return Integer.class;
} else {
return null;
}
}
public String getColumnName(int col) {
return colNames[col];
}
public int getColumnCount() {
return li_cols;
}
public int getRowCount() {
return allRows.size();
}
public Object getValueAt(int arow, int col) {
row = allRows.elementAt(arow);
if(col == 0){
PersianLetterIDPair pL1 = row.getPL1();
return pL1.getLetter();
}
else
if(col == 1){
PersianLetterIDPair pL2 = row.getPL2();
return pL2.getLetter();
}
else{
return row.getFS();
}
}
public boolean isCellEditable(int row, int col) {
int totalNewRows;
if (col == 0 || col == 1) {
totalNewRows = newRows.size();
for(int j = 0; j< totalNewRows; j++)
{
int rVal = ((Integer) newRows.get(j)).intValue();
if( rVal == row + 1){
return true;
}
}
return false;
} else {
return true;
}
}
public void setValueAt(Object aValue, int aRow, int aCol) {
FormSimilarityRow dataRow = allRows.elementAt(aRow);
if (aCol == 0){
PersianLetterIDPair sV = (PersianLetterIDPair) aValue;
dataRow.setPL1(sV);
}
else
if (aCol == 1){
PersianLetterIDPair sV = (PersianLetterIDPair) aValue;
dataRow.setPL2(sV);
}
else
dataRow.setFS((Integer) aValue);
fireTableCellUpdated(aRow, aCol);
}
...
}
我的 Jtable 的定义如下：
myFormSimilaritiesTableModel = new FormSimilaritiesTableModel();
jTable2 = new JTable();
jScrollPane2.setViewportView(jTable2);
jTable2.setModel(myFormSimilaritiesTableModel);
jTable2.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jTable2.getTableHeader()
.setReorderingAllowed(false);
我按照@Polet 所说的提示更改了 getValueAt 方法以返回 PersianLetterIDPair：
public Object getValueAt(int arow, int col) {
row = allRows.elementAt(arow);
if(col == 0){
PersianLetterIDPair pL1 = row.getPL1();
//return pL1.getLetter();
return pL1;
}
else
if(col == 1){
PersianLetterIDPair pL2 = row.getPL2();
//return pL2.getLetter();
return pL2;
}
else{
return row.getFS();
}
}
然后我创建一个 TableCellRenderer：
class PersianLetterIDPairRenderer extends DefaultTableCellRenderer
{
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
setText(((PersianLetterIDPair)value).getLetter());
return this;
}
}
然后我添加到我的 Jtable：
TableColumn tCol = jTable2.getColumnModel().getColumn(0);
tCol.setCellRenderer(new PersianLetterIDPairRenderer());
tCol = jTable2.getColumnModel().getColumn(1);
tCol.setCellRenderer(new PersianLetterIDPairRenderer());
但是当我从 TableCellRenderer 断开连接时它变得正确：
TableColumn tCol = jTable2.getColumnModel().getColumn(0);
//tCol.setCellRenderer(new PersianLetterIDPairRenderer());
tCol = jTable2.getColumnModel().getColumn(1);
//tCol.setCellRenderer(new PersianLetterIDPairRenderer());