This is my jTable 

    private JTable getJTable() {
		String[] colName = { &quot;Name&quot;, &quot;Email&quot;, &quot;Contact No. 1&quot;, &quot;Contact No. 2&quot;,
				&quot;Group&quot;, &quot;&quot; };
		if (jTable == null) {
			jTable = new JTable() {
				public boolean isCellEditable(int nRow, int nCol) {
					return false;
				}
			};
		}
		DefaultTableModel contactTableModel = (DefaultTableModel) jTable
				.getModel();
		contactTableModel.setColumnIdentifiers(colName);
		jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		return jTable;
	}

I will call this method to retrieve the data from database and put it into table model

    public void setUpTableData() {
		DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
		ArrayList&lt;Contact&gt; list = new ArrayList&lt;Contact&gt;();
		if (!con.equals(&quot;&quot;))
			list = sql.getContactListsByGroup(con);
		else
			list = sql.getContactLists();
		for (int i = 0; i &lt; list.size(); i++) {
			String[] data = new String[7];
			
				data[0] = list.get(i).getName();
				data[1] = list.get(i).getEmail();
				data[2] = list.get(i).getPhone1();
				data[3] = list.get(i).getPhone2();
				data[4] = list.get(i).getGroup();
				data[5] = list.get(i).getId();
			
			tableModel.addRow(data);
		}
		jTable.setModel(tableModel);
	}

Currently I was using this method to refresh the table after updating the table data. I will first clear the table 

    DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
    tableModel.setRowCount(0);

and then restructure the table model again so it will refresh the jTable. But I was thinking is there any best practices or better way to do that? 

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JTable How to refresh table model after insert delete or update the data.