A good answer might be:

They all must be added to the Frame, in the correct order.

If you forget to add a Panel (or other component) to the frame, then those components will not appear on the monitor screen. Its easy to forget to do this. Here is the program fragment, so far:

public class percentFat extends Frame implements ActionListener { Label title = new Label("Percent of Calories from Fat"); Label fatLabel = new Label("Enter grams of fat: "); Label calLabel = new Label("Enter total calories: "); Label perLabel = new Label("Percent calories from fat: "); TextField inFat = new TextField( 7 ); TextField inCal = new TextField( 7 ); TextField outPer = new TextField( 7 ); Button doit = new Button("Do It!"); Panel fatPanel = new Panel(); // fat input components Panel calPanel = new Panel(); // calorie input components Panel perPanel = new Panel(); // percent fat output components percentFat() // constructor { setTitle("Calories from Fat"); setLayout( new FlowLayout() ); // choose the layout manager fatPanel.add( fatLabel ); fatPanel.add( inFat ); calPanel.add( calLabel ); calPanel.add( inCal ); perPanel.add( perLabel ); perPanel.add( outPer); add( ) ; add( ) ; add( ) ; add( ) ; add( ) ; outPer.setEditable( false ); doit.addActionListener( this ); }

There are five components: the title, the doit button, and the three panels. So the add() method is used five times. Look back at how the fat application GUI looks to decide what the order should be.

QUESTION 6:

Decide in which order components will be added. Click the buttons to see if you are right.