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Checkboxes are on-off toggles implemented as
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Checkbox red = new Checkbox("Red");
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Checkbox green = new Checkbox("Green");
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Checkbox blue = new Checkbox("Blue",null, true);
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add(red); add(green); add(blue);
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The first two are initially set to "false" as the optional third argument is not given. The last one is initially set to "true".
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The state of a checkbox, i.e. whether it is checked, is given by a boolean result of the method, getState:
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if (red.getState()) . . .;
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If a user clicks a Checkbox, an ItemEvent is generated. The listener must implement ItemListener with the one method itemStateChanged (ItemEvent e).
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