Check boxes are used to select a boolean value. Each
Checkbox has a label that should be used to tell the
user what the Checkbox represents. For instance a
Checkbox with the label "Anchovies" would be checked
if the user wants anchovies on their pizza and unchecked if they
don't.
Checkboxes are often used to select from a list of possible
choices when as few selections as zero or as many as everything on
the list may be made. Adding a Checkbox to an applet
is simple. Just declare it, construct it and add it.
Checkbox c = new Checkbox("Pepperoni"));
add(c);As usual these steps may be combined into the single line
add(new Checkbox("Pepperoni"));
By default check boxes are unchecked when created. If you want a
Checkbox to start life checked, use the following
constructor instead:
add(new Checkbox("Pepperoni", null, true));
The null is a reference to a
CheckboxGroup. Passing null for this argument
says that this Checkbox does not belong to a
CheckboxGroup.
Every Checkbox has a boolean value,
either true or false. When the
Checkbox is checked that value is true. When it
is unchecked that value is false. You access this value using the
Checkbox's getState() and
setState(boolean b) methods. For example
private void handleCheckbox(Checkbox c) {
if (c.getState()) price += 0.50;
else price -= 0.50;
}