Java Reference
In-Depth Information
67
Adds a button to the button panel.
68 @param label
the button label
69 */
70
private void
addButton(
final
String label)
71 {
72
class
DigitButtonListener
implements
ActionListener
73 {
74
public void
actionPerformed(ActionEvent event)
75 {
76
77 //
Don't add two decimal points
78
if
(label.equals(
Ð.Ñ
)
79 &&
display.getText().indexOf(
Ð.Ñ
) !=
-1
)
80
return;
81
82 //
Append label text to button
83 display.setText(display.getText()
+ label);
84 }
85 }
86
87 JButton button =
new
JButton (label);
88 buttonPanel.add(button);
89 ActionListener listener =
new
DigitButtonListener();
90 button.addActionListener(listener);
91 }
92
93 /**
94
Gets the value that the user entered.
95 @return
the value in the text field of the keypad
96 */
97
public double
getValue()
98 {
99
return
Double.parseDouble(display.getText());
100 }
101
102 /**
