Basic HTML version of Foils prepared 18 May 97

Foil 45 AWT Components -- Radio Buttons , CheckboxGroup

From Java Tutorial - Spring 1997 Part 3:Graphics and the Abstract Windowing Toolkit Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox
Radiobuttons are identical to Checkbox's but grouped so that only one checkbox in a group can be on at a time. They use same class for buttons but add CheckboxGroup class
CheckboxGroup cbg = new CheckboxGroup();
cb1 = new Checkbox("Red", cbg, false));
cb2 = new Checkbox("Green", cbg, false));
cb3 = new Checkbox("Blue", cbg, true));
add(cb1); add(cb2); add(cb3);
In addition to checking the state of checkboxes in a group, the method getCurrent returns the one checkbox which is on:
  • cb = cbg.getCurrent();

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