我有一个JTable填充了一个自定义的DataModel(粘贴在下面),当我调用populate()方法时,它似乎用重复数据填充表 – 每行都重复填充相同的值.然而,通过仔细检查(简单地打印“数据”字段),数据模型没有故障 – 它保存正确的数据,格式为我预期的.是什么赋予了？
import java.util.ArrayList;
import javax.swing.table.AbstractTableModel;
@SuppressWarnings("serial") // we don't expect this app to ever use serialized classes. EVER.
public class CollectionDataModel extends AbstractTableModel {
private ArrayList<ArrayList<String>> data;
public CollectionDataModel() {
data = new ArrayList<ArrayList<String>>();
}
@Override
public int getColumnCount() {
if(data.isEmpty()) return 0;
return data.get(0).size();
}
@Override
public int getRowCount() {
return data.size();
}
@Override
public Object getValueAt(int rowIndex,int columnIndex) {
if(rowIndex > getRowCount()) return null;
if(columnIndex > getColumnCount()) return null;
return data.get(rowIndex).get(columnIndex);
}
public void populate(Collection c) {
data.clear();
for(Item i : c.getItems()) {
ArrayList<String> row = new ArrayList<String>();
for(Property p : i.getProperties().values()) {
row.add(p.toString());
}
data.add(row);
}
fireTableDataChanged();
}
}
解决方法
这是一个可能有帮助的完整示例.由于示例地图是不可修改的,我将您引用到@ mKorbel的
example如何覆盖isCellEditable()和setValueAt().
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
/** @see https://stackoverflow.com/questions/9132987 */
public class EnvTableTest extends JPanel {
public EnvTableTest() {
this.setLayout(new GridLayout());
this.add(new JScrollPane(new JTable(new EnvDataModel())));
}
private static class EnvDataModel extends AbstractTableModel {
private Map<String,String> data = System.getenv();
private String[] keys;
public EnvDataModel() {
keys = data.keySet().toArray(new String[data.size()]);
}
@Override
public String getColumnName(int col) {
if (col == 0) {
return "Key";
} else {
return "Value";
}
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public int getRowCount() {
return data.size();
}
@Override
public Object getValueAt(int row,int col) {
if (col == 0) {
return keys[row];
} else {
return data.get(keys[row]);
}
}
}
private void display() {
JFrame f = new JFrame("EnvTableTest");
f.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new EnvTableTest().display();
}
});
}
}
