jTable data problem
Hello.
I have a code that read file and store in arraylist and then convert to array(To use for table model)
My class extends abstracttablemodel correctly.
My All Code is:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.table.AbstractTableModel;
public class ReadFileToList extends AbstractTableModel{
String[] col={"Fname","Lname","Number"};
List<String> data=new ArrayList<String>();
String[][] Arraydata;
public void readtolist() throws IOException{
FileReader fr=new FileReader("D:\\AllUserRecords.txt");
BufferedReader br=new BufferedReader(fr);
String line;
while((line=br.readLine()) !=null){
data.add(line);
System.out.println(line);
}
br.close();
Arraydata=(String[][]) data.toArray();
}
public String getColumnName(int colu){
return col[colu];
}
public int getRowCount() {
return Arraydata.length;
}
public int getColumnCount() {
return col.length;
}
public Object getValueAt(int rowIndex, int columnIndex) {
return Arraydata[rowIndex][columnIndex];
}
}
My main Class is ReadFileToListM:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class ReadFileToListM {
ReadFileToList rftl=new ReadFileToList();
public ReadFileToListM(){
JFrame frame=new JFrame();
JTable table=new JTable(rftl);
JPanel panel=new JPanel();
JScrollPane sp=new JScrollPane(table);
panel.add(sp);
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(470,470);
frame.setVisible(true);
}
public static void main(String[] args){
new ReadFileToListM();
}
}
but it has Exception! Please help me, Thanks.
this is my Exceptions:
Exception in thread "main" java.lang.NullPointerException
at Library.ReadFileToList.getRowCount(ReadFileToList.java:30)
at javax.swing.JTable.getRowCount(JTable.java:2583)
at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1646)
at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1687)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.JViewport.getViewSize(JViewport.java:1018)
at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:476)
at java.awt.Container.preferredSize(Container.java:1616)
at java.awt.Container.getPreferredSize(Container.java:1601)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:594)
at java.awt.Container.layout(Container.java:1432)
at java.awt.Container.doLayout(Container.java:1421)
at java.awt.Container.validateTree(Container.java:1519)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validate(Container.java:1491)
at java.awt.Window.show(Window.java:820)
at java.awt.Component.show(Component.java:1419)
at java.awt.Component.setVisible(Component.java:1372)
at java.awt.Window.setVisible(Window.java:801)
at Library.ReadFileToListM.<init>(ReadFileToListM.java:20)
at Library.ReadFileToListM.main(ReadFileToListM.java:24)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Library.ReadFileToList.getRowCount(ReadFileToList.java:30)
at javax.swing.JTable.getRowCount(JTable.java:2583)
at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1646)
at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1687)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.JViewport.getViewSize(JViewport.java:1018)
at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:476)
at java.awt.Container.preferredSize(Container.java:1616)
at java.awt.Container.getPreferredSize(Container.java:1601)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:594)
at java.awt.Container.layout(Container.java:1432)
at java.awt.Container.doLayout(Container.java:1421)
at java.awt.Container.validateTree(Container.java:1519)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validate(Container.java:1491)
at java.awt.Window.dispatchEventImpl(Window.java:2427)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD STOPPED (total time: 4 seconds)
I have a code that read file and store in arraylist and then convert to array(To use for table model)
My class extends abstracttablemodel correctly.
My All Code is:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.table.AbstractTableModel;
public class ReadFileToList extends AbstractTableModel{
String[] col={"Fname","Lname","Number"};
List<String> data=new ArrayList<String>();
String[][] Arraydata;
public void readtolist() throws IOException{
FileReader fr=new FileReader("D:\AllUserRecords.txt");
BufferedReader br=new BufferedReader(fr);
String line;
while((line=br.readLine()) !=null){
data.add(line);
System.out.println(line);
}
br.close();
Arraydata=(String[][]) data.toArray();
}
public String getColumnName(int colu){
return col[colu];
}
public int getRowCount() {
return Arraydata.length;
}
public int getColumnCount() {
return col.length;
}
public Object getValueAt(int rowIndex, int columnIndex) {
return Arraydata[rowIndex][columnIndex];
}
}
My main Class is ReadFileToListM:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class ReadFileToListM {
ReadFileToList rftl=new ReadFileToList();
public ReadFileToListM(){
JFrame frame=new JFrame();
JTable table=new JTable(rftl);
JPanel panel=new JPanel();
JScrollPane sp=new JScrollPane(table);
panel.add(sp);
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXITONCLOSE);
frame.setSize(470,470);
frame.setVisible(true);
}
public static void main(String[] args){
new ReadFileToListM();
}
}
but it has Exception! Please help me, Thanks.
this is my Exceptions:
Exception in thread "main" java.lang.NullPointerException
at Library.ReadFileToList.getRowCount(ReadFileToList.java:30)
at javax.swing.JTable.getRowCount(JTable.java:2583)
at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1646)
at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1687)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.JViewport.getViewSize(JViewport.java:1018)
at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:476)
at java.awt.Container.preferredSize(Container.java:1616)
at java.awt.Container.getPreferredSize(Container.java:1601)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:594)
at java.awt.Container.layout(Container.java:1432)
at java.awt.Container.doLayout(Container.java:1421)
at java.awt.Container.validateTree(Container.java:1519)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validate(Container.java:1491)
at java.awt.Window.show(Window.java:820)
at java.awt.Component.show(Component.java:1419)
at java.awt.Component.setVisible(Component.java:1372)
at java.awt.Window.setVisible(Window.java:801)
at Library.ReadFileToListM.(ReadFileToListM.java:20)
at Library.ReadFileToListM.main(ReadFileToListM.java:24)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Library.ReadFileToList.getRowCount(ReadFileToList.java:30)
at javax.swing.JTable.getRowCount(JTable.java:2583)
at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1646)
at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1687)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.JViewport.getViewSize(JViewport.java:1018)
at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:476)
at java.awt.Container.preferredSize(Container.java:1616)
at java.awt.Container.getPreferredSize(Container.java:1601)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:594)
at java.awt.Container.layout(Container.java:1432)
at java.awt.Container.doLayout(Container.java:1421)
at java.awt.Container.validateTree(Container.java:1519)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validateTree(Container.java:1526)
at java.awt.Container.validate(Container.java:1491)
at java.awt.Window.dispatchEventImpl(Window.java:2427)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD STOPPED (total time: 4 seconds)
My txt File:
FName Lname Number
second secondsecond 22
thired thithird 33
fourth fourfourr 44
fifth fiffif 55
Thanks for help!
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