RowAtPoint and columnAtPoint always return 0

Question

//in NormalGUI
     ptsinfo.addActionListener(new NTListener());
     delete.addActionListener(new NTListener());
     nTable.addMouseListener(new NTListener());
//in NormalGUI
public class NTListener extends MouseAdapter implements ActionListener{
     int selectRow,selectColumn;
     public void mousePressed(MouseEvent e){
          if (e.isPopupTrigger()) {
               showPopup(e);
     public void mouseReleased(MouseEvent e){
          if (e.isPopupTrigger()) {
               showPopup(e);
     public void showPopup(MouseEvent e){
          NormalGUI.nPop.show(e.getComponent(), e.getX(), e.getY());
          selectRow = NormalGUI.nTable.rowAtPoint(new Point(e.getX(),e.getY()));
          selectColumn = NormalGUI.nTable.columnAtPoint(new Point(e.getX(),e.getY()));
          System.out.println(new Point(e.getX(),e.getY()));     
}the point printed has not problem but rowAtPoint and columnAtPoint.
The popup menu shows at the right point
I try to use e.getSource and find that it really from nTable.
they are always return 0 instead of -1?
Why it happens? Thanks.

Answer 1

Darryl.Burke wrote:
Doesn't happen to me. To get better help sooner, post a SSCCE that clearly demonstrates your problem.
db
import javax.swing.table.*;
import javax.swing.*;
import java.util.*;
class NTable extends AbstractTableModel{
     static Object[] cells = {"",".mpg","大塚愛","ユメクイ",Boolean.FALSE,"2006-08-04","","Mステ","00:02:34","1440x1080","323014660","","","[HDTV] 大塚愛 - [2006.08.04] - ユメクイ ( Mステ - 17Mbps 2m34s 1440x1080).mpg","大塚愛 - ユメクイ (2006.08.04 Mステ) .ts",new Integer(0)};
     static Object[] cells2 = {"",".m2t","大塚愛","金魚花火",Boolean.FALSE,"2004-08-29","BShi","BEAT MOTION","00:02:32","1440x1080","397588604","","","[HDTV-TS] 大塚愛 - [2004.08.29] - 金魚花火 (BShi BEAT MOTION - 20Mbps 2m32s 1440x1080).m2t","大塚愛-金魚花火[BEAT.MOTION.2004.08.29].ts",new Integer(0)};
     int noOfFile;
     static String[] col = {"no.","Suffix","Artist","Songs","Talk","Date","TV station","Program","Duration","Resolution","Filesize","ptsinfo","Date added","new name","old name","rare"};
     static ArrayList<Object[]> datas = new ArrayList<Object[]>();
     public NTable(){
               datas.add(cells);
               datas.add(cells2);
     public int getRowCount(){
          return datas.size();
     public int getColumnCount(){
          return col.length;
    public Object getValueAt(int r, int c){
         if(c==0){
              return String.format("%04d", r+1);
        return getDataList(r)[c];      
     public Class getColumnClass(int c){
          if(c==11){
               try{
                    return JButton.class;
               }catch(Exception e){}
          return getDataList(0)[c].getClass();
     public String getColumnName(int c){
          return col[c];
     public void setValueAt(Object obj, int r, int c){
          Object[] tempArray = getDataList(r);
          tempArray[c] = obj;
          datas.set(r, tempArray);
          if(c==15){
               NormalGUI.nTable.changeSelection(r+1, c, false, false);
     public boolean isCellEditable(int r, int c){
          if(c>0&&c<=10||c==15){
               return true;
          }else{
               return false;
     public static int getdatas(){
          try{
               return datas.size();
          }catch(Exception e){
               return 0;
     public static Object[] getDataList(int r){
          return datas.get(r);
import java.awt.Point;
import java.awt.event.*;
public class NTListener extends MouseAdapter implements ActionListener{
     int selectRow,selectColumn;
     public void mousePressed(MouseEvent e){
        if (e.isPopupTrigger()) {
             showPopup(e);
     public void mouseReleased(MouseEvent e){
        if (e.isPopupTrigger()) {
             showPopup(e);
     public void mouseClicked(MouseEvent e){}     
     public void mouseExited(MouseEvent e){}
     public void mouseEntered(MouseEvent e){}
     public void showPopup(MouseEvent e){
          NormalGUI.nPop.show(e.getComponent(), e.getX(), e.getY());
         selectRow = NormalGUI.nTable.rowAtPoint(new Point(e.getX(),e.getY()));
         selectColumn = NormalGUI.nTable.columnAtPoint(new Point(e.getX(),e.getY()));
         System.out.println(new Point(e.getX(),e.getY()));     
     public void actionPerformed(ActionEvent e){
          if(e.getSource().equals(NormalGUI.ptsinfo)){
                try {
                     Runtime rt = Runtime.getRuntime();               
                     Process prcs = rt.exec("C:\\WINDOWS.0\\AppPatch\\AppLoc.exe \"E:\\(A)&#31243;&#24335; (F)\\&#30475;&#22294;&#25991;&#38899;&#27138;&#39006;\\ptsInfo050\\ptsinfo.exe\" \"/L0411\"");
                     } catch(Exception ioe) { System.out.println(ioe); }
          }else if(e.getSource().equals(NormalGUI.delete)){
               System.out.println(selectRow+"+"+selectColumn);
               NTable.datas.remove(selectRow);
               NormalGUI.nTable.updateUI();
import java.awt.Font;
import javax.swing.*;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
public class NormalGUI extends JFrame{
     static TableModel nModel;
     static JTable nTable;
     static JScrollPane nPanel;
     static JPopupMenu nPop = new JPopupMenu();
     static JMenuItem ptsinfo = new JMenuItem("Open ptsinfo");
     static JMenuItem delete = new JMenuItem("Delete this file");
     public NormalGUI(){
          setBounds(0,0,500,500);
          nModel = new NTable();
          nTable = new JTable(nModel);   
          nPanel = new JScrollPane(nTable);
          nTable.setRowHeight(20);
          int[] columnWidth={45,145,100,150,45,105,95,200,85,105,115,65,100,900,400,40};
          nTable.setFont(new Font("&#24494;&#36575;&#27491;&#40657;&#39636;", Font.BOLD, 16));
          nTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
          nTable.addMouseListener(new NTListener());
          ptsinfo.addActionListener(new NTListener());
          delete.addActionListener(new NTListener());
          nPop.add(ptsinfo);
          nPop.add(delete);
          TableColumn column;
          for (int i = 0; i<nTable.getColumnCount(); i++) {               
               column = nTable.getColumnModel().getColumn(i);
               column.setPreferredWidth(columnWidth);
          add(nPanel);
          setVisible(true);
     public static void main(String[] args){
          new NormalGUI();