Java Reference
In-Depth Information
Sample Run: (Figure 6-6 shows a sample run.)
6
FIGURE 6-6
Sample run for
RectangleProgramTwo
Now you are ready to create and place the text fields and buttons. The techniques
for creating and placing components, such as
JTextField
and
JButton
,ina
container are similar to the ones used for
JLabel
, and are described in the next
two sections.
JTextField
As you may recall, text fields are objects belonging to the
class
JTextField
. Therefore,
you can create a text field by declaring a reference variable of type
JTextField
followed
by an instantiation of the object.
Table 6-4 describes some of the methods of the
class
JTextField
.
TABLE 6-4
Some Methods of the
class
JTextField
Method / Description
public
JTextField(int columns)
//Constructor to set the size of the text field.
public
JTextField(String str)
//Constructor to initialize the object with the text specified
//by str.
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