Java

deleting rows from a JTable

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Join Date: Jun 2004

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Postaholic

deleting rows from a JTable

Jun 20th, 2005

I know that you can call this method to delete a row from a JTable:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
 
DefaultTableModel.deleteRow(index);
DefaultTableModel.deleteRow(index);

I need to delete all of the rows at some point, and this is not working:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
                          for (int i=0; i<dtm.getRowCount(); i++)
			 {
				 dtm.removeRow(i);
				 mortgageTable.revalidate();
			 }
                          for (int i=0; i<dtm.getRowCount(); i++)
			 {
				 dtm.removeRow(i);
				 mortgageTable.revalidate();
			 }

I tried revalidating, but that didn't work. This only deletes the last row. Now, at runtime the table consists of only one row and later many rows are added. So I'm thinking the DefaultTableModel is not picking up the newly added rows.

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Join Date: Nov 2004

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duckman

Re: deleting rows from a JTable

Jun 21st, 2005

Think of what you're doing and you get the idea quickly enough.
You delete row 0, then increase i to 1, then move to the next row (which is the old row 2).
Then you delete row 1, increase i to 2, move to the next row.

If you want to do something like this, start at the end and delete from there to the front.
Something like

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
int numRows == dtm.getRowCount();
for (int i=numRows;i>=0;i++) {
  dtm.removeElement(i);
  mortgageTable.revalidate();
}
int numRows == dtm.getRowCount();
for (int i=numRows;i>=0;i++) {
  dtm.removeElement(i);
  mortgageTable.revalidate();
}

should give you the results you are looking for.

As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.

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Join Date: Jun 2004

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Re: deleting rows from a JTable

Jun 21st, 2005

WOW! I would have NEVER spoted that. I was thinking since it ran at runtime with only one row that it never updated the count. Thank you so much; I was banging my head against the wall on this one...I wish I could give you a big hug for that. :lol:

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duckman

Re: deleting rows from a JTable

Jun 22nd, 2005

I've banged my head against the wall more than once over the same problem, but finally the solution stuck in my head

As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.

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muhdazwa

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Re: deleting rows from a JTable

May 22nd, 2008

Hi,

Hope this code is simple enough:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
while (mortgageTable.getRowCount() > 0) {
	((DefaultTableModel) mortgageTable.getModel()).removeRow(0);
}
while (mortgageTable.getRowCount() > 0) {
	((DefaultTableModel) mortgageTable.getModel()).removeRow(0);
}

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jasimp

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Senior Poster

Re: deleting rows from a JTable

May 22nd, 2008

Original post was three years ago. I doubt they still need help. Read the dates before posting.

"Argyou not with the hand you are dealt in cards or life." ---- Wizard and Glass

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muhdazwa

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Re: deleting rows from a JTable

May 22nd, 2008

Hi' thanks for reminding the date.

For me, knowledge can never be rotten. Each day there will be someone seeking better way to programs. Maybe they stumble daniweb and appreciate what we share here despite how old the codes is

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topumirza

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Re: deleting rows from a JTable

Nov 15th, 2008

•

Originally Posted by jasimp

Original post was three years ago. I doubt they still need help. Read the dates before posting.

public synchronized void clearTable(){
int numrows = tblSales.getRowCount();
for(int i = numrows - 1; i >=0; i--){
modelTblsales.removeRow(i);
}
}

Last edited by topumirza; Nov 15th, 2008 at 4:49 pm.

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gregsci

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Re: deleting rows from a JTable

Dec 11th, 2008

This is more efficient way:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
//deletes ALL the rows
DefaultTableModel.getDataVector().removeAllElements();
//repaints the table and notify all listeners (only once!)
DefaultTableModel.fireTableDataChanged();
//deletes ALL the rows
DefaultTableModel.getDataVector().removeAllElements();
//repaints the table and notify all listeners (only once!)
DefaultTableModel.fireTableDataChanged();

If you do this

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
while (mortgageTable.getRowCount() > 0) {
	((DefaultTableModel) mortgageTable.getModel()).removeRow(0);
}
while (mortgageTable.getRowCount() > 0) {
	((DefaultTableModel) mortgageTable.getModel()).removeRow(0);
}

This will fire notificantions to all the listeners everytime you delete one row, so, if you have 100000 rows........

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stultuske

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Re: deleting rows from a JTable

#10

Dec 12th, 2008

•

Originally Posted by gregsci

This is more efficient way:
Help with Code Tags

Java Syntax (Toggle Plain Text)
//deletes ALL the rows
DefaultTableModel.getDataVector().removeAllElements();
//repaints the table and notify all listeners (only once!)
DefaultTableModel.fireTableDataChanged();
//deletes ALL the rows DefaultTableModel.getDataVector().removeAllElements(); //repaints the table and notify all listeners (only once!) DefaultTableModel.fireTableDataChanged();
If you do this
Help with Code Tags

Java Syntax (Toggle Plain Text)
while (mortgageTable.getRowCount() > 0) {
	((DefaultTableModel) mortgageTable.getModel()).removeRow(0);
}
while (mortgageTable.getRowCount() > 0) { ((DefaultTableModel) mortgageTable.getModel()).removeRow(0); }
This will fire notificantions to all the listeners everytime you delete one row, so, if you have 100000 rows........

let me guess ... your clock stopped in the past too?