JLabel fatLabel    with    JTextField inFat

JLabel calLabel    with    JTextField inCal

JLabel perLabel    with    JTextField outPer

Adding Components to a JPanel

The idea is to have three panels, one per each pair of label and text field. The lone title at the top and the button at the bottom do not need to be placed in panels. The lines showing the panels do not actually appear when the program is run.

The add() method is used to place components in a panel. The panel also needs a layout manager. By default, the layout manager is FlowLayout. Here is the program, now with add() method calls:

public class percentFatPan extends JFrame 
  implements ActionListener
{
  JLabel title    = new JLabel("Percent of Calories from Fat");
  JLabel fatLabel = new JLabel("Enter grams of fat:   ");
  JLabel calLabel = new JLabel("Enter total calories: ");
  JLabel perLabel = new JLabel("Percent calories from fat: ");

  JTextField inFat  = new JTextField( 7 );
  JTextField inCal  = new JTextField( 7 );
  JTextField outPer = new JTextField( 7 );

  JButton    doit   = new JButton("Do It!");

  JPanel fatPanel   = new JPanel();
  JPanel calPanel   = new JPanel();
  JPanel perPanel   = new JPanel();
  
  public percentFatPanel()   
  {  
    fatPanel.add( ________ );
    fatPanel.add( ________ );
    calPanel.add( ________ );
    calPanel.add( ________ );
    perPanel.add( ________ );
    perPanel.add( ________ );
  
   . . . . .