What is Java radio button?

Posted on by Mary Andersen

What is Java radio button?

The JRadioButton class is used to create a radio button. It is used to choose one option from multiple options. It is widely used in exam systems or quiz. It should be added in ButtonGroup to select one radio button only.

What is ActionListener this in Java?

ActionListener in Java is a class that is responsible for handling all action events such as when the user clicks on a component. Mostly, action listeners are used for JButtons. An ActionListener can be used by the implements keyword to the class definition.

How do I know which JRadioButton is selected?

To find the selected radio button, you follow these steps:

  1. Select all radio buttons by using a DOM method such as querySelectorAll() method.
  2. Get the checked property of the radio button. If the checked property is true , the radio button is checked; otherwise, it is unchecked.

How do I run an ActionListener in Java?

If you implement the ActionListener class, you need to follow 3 steps:

  1. Implement the ActionListener interface in the class: public class ActionListenerExample Implements ActionListener.
  2. Register the component with the Listener: component.
  3. Override the actionPerformed() method:

What is difference between checkbox and radio button in Java?

Checkboxes and radio buttons are elements for making selections. Checkboxes allow the user to choose items from a fixed number of alternatives, while radio buttons allow the user to choose exactly one item from a list of several predefined alternatives.

Can radio button be multi select?

Radio buttons allow a user to select a single option among multiple options. You can set the Choice Value of each option, for each button, as well as group these buttons by giving them the same Group Name.

Can multiple radio buttons be checked?

Only one radio button in a group can be checked. You have two radio buttons with different names. This means that you have two radio groups, each containing one radio button. You need to put them in the same group (by making them share a name) if you only want one of them to be selected.