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Chapter 13: Problem 14

What class do you use to create a radio button menu item? What do you pass to the class constructor? How do you cause it to be initially selected?

Short Answer

Expert verified
Answer: The `JRadioButtonMenuItem` class is used to create a radio button menu item. Different constructors can be used for various initial properties, such as `JRadioButtonMenuItem()`, `JRadioButtonMenuItem(String text)`, and `JRadioButtonMenuItem(String text, boolean selected)`. To make the radio button menu item initially selected, pass `true` as the second parameter of the constructor `JRadioButtonMenuItem(String text, boolean selected)` or use the `setSelected(boolean selected)` method, passing `true` as the argument.

Step by step solution

01

Class for Radio Button Menu Item

The class used to create a radio button menu item is `JRadioButtonMenuItem`. It is part of the javax.swing package in Java.
02

Constructor Parameters

The class constructor for `JRadioButtonMenuItem` can take different parameters, depending on the desired initial properties for the radio button menu item. Some commonly used constructors are: - `JRadioButtonMenuItem()` – Creates a radio button menu item with no initial text and not initially selected. - `JRadioButtonMenuItem(String text)` – Creates a radio button menu item with the specified `text` as its label and not initially selected. - `JRadioButtonMenuItem(String text, boolean selected)` – Creates a radio button menu item with the specified `text` as its label and a boolean value `selected` that indicates whether the radio button is initially selected or not.
03

Initial Selection

To make the radio button menu item initially selected, you need to pass `true` as the second parameter of the constructor `JRadioButtonMenuItem(String text, boolean selected)`. Alternatively, you can use the `setSelected(boolean selected)` method of the `JRadioButtonMenuItem` class, passing `true` as the argument. Example: ``` JRadioButtonMenuItem radioButtonMenuItem = new JRadioButtonMenuItem("Option 1", true); // or radioButtonMenuItem.setSelected(true); ```

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