Arrays, Loops, and Layout Managers Using External Classes - Java Programming: Comprehensive Concepts and Techniques - page 356

Coding the clearFields() Method

The final method in the Reservations class is a user-defined method named
clearFields(), which clears the input fields after a successful booking. Figure 5-35
displays the code for the clearFields() method. The method accepts no passed
parameters and returns void.

136
137 //reset the text fields and choice component

138 void clearFields ()

139 {

140 nameField.setText ( "" ) ;

141 phoneField.setText ( "" ) ;

142 numberOfGuests.select ( 0 ) ;

143 nameField.requestFocus () ;

144 hidden.setState ( true ) ;

145 } //end of clearFields() method

146
147 } //end of Reservations class

FIGURE 5-35

When called from the actionPerformed() method, the clearFields() method
will reset the nameField to a null String (" ") in line 140 and reset the phoneField
in line 141. To reset the Choice component in line 142, the select() method ,
with its integer argument that represents the position in the list, is set to zero
(the first element in the list). The requestFocus() method in line 143 sets the
focus and returns the insertion point to the nameField. The hidden Checkbox
again is set to true in line 144 to clear the Nonsmoking and Smoking option
buttons on the interface.
The step below enters the code for the clearFields() method.

To Enter Code for the clearFields() Method

1. Enter the code as shown in Figure 5-35.
The TextPad window displays the code for the clearFields() method
(Figure 5-36). The closing brace in line 147 ends the Reservations class.

clearFields()
method

closing brace
for Reservations
class

FIGURE 5-36