我无法解决此错误,它总是在网上说“无法访问的声明”:
int row = e.getFirstRow()
它建议,拆分声明,但是,即使在那之后,错误在"e.getFirstRow()"
行上保持不变:
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class View extends javax.swing.JFrame implements TableModelListener{
int row;
DefaultTableModel model;
public View() {
initComponents();
model = (DefaultTableModel) jTable2.getModel();
model.addRow(new Object[]{"abc","abc","abc","abc"});
model.addRow(new Object[]{"abc","abc","abc","abc"});
model.addRow(new Object[]{"abc","abc","abc","abc"});
model.addRow(new Object[]{"abc","abc","abc","abc"});
model.addTableModelListener(this);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane2 = new javax.swing.JScrollPane();
jTable2 = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTable2.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"A", "B", "C", "D"
}
) {
Class[] types = new Class [] {
java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
};
public Class getColumnClass(int columnIndex) {
return types [columnIndex];
}
});
jScrollPane2.setViewportView(jTable2);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 546, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 202, javax.swing.GroupLayout.PREFERRED_SIZE)
);
pack();
}// </editor-fold>
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new View().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable2;
// End of variables declaration
@Override
public void tableChanged(TableModelEvent e) {
throw new UnsupportedOperationException("Not supported yet.");
row = e.getFirstRow();
int column = e.getColumn(); //<<<--------------- This LINE
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object data = model.getValueAt(row, column);
}
}
答案 0 :(得分:1)
问题是这一行(在无法到达之前):
throw new UnsupportedOperationException("Not supported yet.");
你的程序永远不会执行该语句下面的内容,因为它总是会抛出Exception
。编译器会告诉你永远不会执行“无法访问的语句”。
删除throw ...
声明,您就可以了!