Inserting a Row in a JTable Component
To insert a row of data to a JTable component, you need to insert it
to its table model. A simple implementation of a table model that
supports the insertion of row data is DefaultTableModel.
When inserting a row using DefaultTableModel.insertRow(), the position
of the new row must be specified. Positions are locations between
rows. For example, if there are 2 rows in a table, there are 3
possible positions – – 0, 1,and 2. Inserting a row at position 0 makes the
new row the first row. Inserting a row at position 2 makes the new
row the last row.
When inserting a row with fewer values than columns, the
left-most fields in the new row are populated with the supplied values
(left-to-right) and the fields without values are set to null. When
inserting a row with more values than columns, the extra values are
ignored.
DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
// Create a couple of columns
model.addColumn("Col1");
model.addColumn("Col2");
// Create the first row
model.insertRow(0, new Object[]{"r1"});
// Insert a row so that it becomes the first row
model.insertRow(0, new Object[]{"r2"});
// Insert a row at position p
int p = 2;
model.insertRow(p, new Object[]{"r3"});
// Insert a row before the second row
int r = 1;
model.insertRow(r, new Object[]{"r4"});
// the new row is now the second row
// Insert a row after the second row
r = 1;
model.insertRow(r+1, new Object[]{"r5"});
// the new row is now the third row
// Append a row
model.insertRow(model.getRowCount(), new Object[]{"r5"});
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