Chapter 12, Problem 3FTE

Explanation of Solution

Given program:

RadioButton radio1 = new RadioButton("Option 1"); //Line 1

RadioButton radio2 = new RadioButton("Option 2"); //Line 2

ToggleGroup radioGroup = new ToggleGroup(); //Line 3

radioGroup.setToggleGroup(radio1); //Line 4

radioGroup.setToggleGroup(radio2); //Line 5

RadioButton:

• User create a “RadioButton” control using the “RadioButton” class.
  • This class is present in the package of “javafx.scene.control”.
• The controls “RadioButton” is used to permit the user to choose one option from the several possible options.
  • It may be selected or deselected.
• Each “RadioButton” consist of a small circle.
  • If a circle appears filled-in, then the “RadioButton” is selected.
  • If a circle appears empty, then the “RadioButton” is deselected.

Example:

The example for “RadioButton” is shown below:

//create the radio button

RadioButton exampleButton = new RadioButton("Option 1");

ToggleGroup:

• It is one class of JavaFX application which is used to create toggle group.
• It is available in package “javafx.scene.control”.
• Generally, the “RadioButton” controls are grouped together in a toggle group.
• In a toggle group, only one of the “RadioButton” controls may be chosen at any time.
  • Then this “RadioButton” are referred as “mutually exclusive”.

Example:

The example for “ToggleGroup” is shown below:

// create a ToggleGroup.

ToggleGroup newToggleGroup = new ToggleGroup();

• The above code is used to create a “ToggleGroup”.

Calling “RadioButton” in “ToggleGroup”:

The example for calling “RadioButton” in “ToggleGroup” is shown below:

//create the radio button 1...