Action from Radio Button

I'm creating a Temperature Converter, and I want the program to do a certain command once a Radio Button option is selected based on that choice.

What I've done so far; below are the two radio buttons, Fahrenheit to Celsius and Celsius to Fahrenheit and the button Confirm that when clicked performs the action.

Code :

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			{
				rdbtnFtoC = new JRadioButton();
				getContentPane().add(rdbtnFtoC);
				rdbtnFtoC.setText("Fahrenheit to Celsius");
				rdbtnFtoC.setBounds(51, 144, 140, 18);
				btnGTemp.add(rdbtnFtoC);
			}
			{
				rdbtnCtoF = new JRadioButton();
				getContentPane().add(rdbtnCtoF); 
				rdbtnCtoF.setText("Celsius to Fahrenheit");
				rdbtnCtoF.setBounds(51, 168, 140, 18);
				btnGTemp.add(rdbtnCtoF); 
			}
			{
				btnConvert = new JButton();
				getContentPane().add(btnConvert);
				btnConvert.setText("Convert!");
				btnConvert.setBounds(401, 153, 121, 38);
				btnConvert.addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent evt) {
						System.out.println("btnConvert.actionPerformed, event="+evt);
						//TODO add your code for btnConvert.actionPerformed
						int val = txtInsert.getInt();
						[B]if(rdbtnFtoC){[/B]
							// Create a command that uses the radio button selection and converts the number in the box using the conversion formula.
 
 
						}
					}
				});
			}
 
			pack();
			this.setSize(602, 403);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
}

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I'm not sure if I can add an if statement, :/ I'm brand new to GUI so not entirely aware of how it works.
Help please?