[resolvido] jtable dimensionar colunas

contentPane.add(textField, BorderLayout.NORTH);
	textField.setColumns(10);
	
	tabela.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
	tabela.setFont(new Font("Tahoma", Font.BOLD, 20));
	String colunas[] = {"ID","Codigo Barras","Mercadorias"}; 	
	tabela.setAutoCreateRowSorter(true);
	tabela.setRowHeight(25);
	DefaultTableModel modelo = new DefaultTableModel(colunas, 0); 
	tabela.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);  
	tabela.getColumnModel().getColumn(0).setPreferredWidth(10);
	tabela.getColumnModel().getColumn(1).setPreferredWidth(15);
	tabela.getColumnModel().getColumn(2).setPreferredWidth(20);