import java.util.List;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
 
public class RadioButtonDemo {
            public static void main(String[] args) throws InterruptedException {
 
                        System.setProperty("webdriver.chrome.driver", "src\\test\\resources\\webdrivers\\window\\chromedriver.exe");
 
                        // Initiate Chrome browser
                        WebDriver driver = new ChromeDriver();
 
                        // Maximize the browser
                        driver.manage().window().maximize();
 
                        // Put an Implicit wait and launch URL
                        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
                        driver.get("https://www.seleniumeasy.com/test/basic-radiobutton-demo.html");
 
                        // Find locator of all Radio Buttons
                        List Radio_Options = driver.findElements(By.xpath("//*[@name='optradio']"));
 
                        // Find no of Radio Buttons available and print their values
                        int radioSize = Radio_Options.size();
                        System.out.println("No Of Radio Button Options :" + radioSize);
 
                        for (int i= 0; i< radioSize; i++) {
                                    System.out.println("Name of Radio Button :"+ Radio_Options.get(i).getAttribute("value"));
                        }
 
                        // Create a boolean variable which will hold the value (True/False)
                        boolean radio_value = false;
 
                        // This statement will return True, in case of first Radio button is selected
                        radio_value = Radio_Options.get(0).isSelected();
                        System.out.println("First Radio Option is Checked :" + radio_value);
 
                        // Find the value of "Get Checked Value" button and print the value
                        String preButtonSelected = driver.findElement(By.xpath("//*[@id='easycont']/div/div[2]/div[1]/div[2]/p[3]"))
                                                .getText();
 
                        if (preButtonSelected.isEmpty() == true) {
                                    System.out.println("Get Checked Value before selection is Empty");
                        } else {
                                    System.out.println("Get Checked Value before selection is :" + preButtonSelected);
                        }
                        Thread.sleep(1000);
 
                        // Identify if Radio Button 1 is selected or not. If Button 1 is already
                        // selected, then select Button 2
                        if (radio_value == true) {
                                    Radio_Options.get(1).click();
                                    System.out.println("Button Selected is :"+ Radio_Options.get(1).getAttribute("value"));
                        } else {
                                    Radio_Options.get(0).click();
                                    System.out.println("Button Selected is :"+ Radio_Options.get(0).getAttribute("value"));
                        }
 
                        // Click on "Get Checked Value" button
                        driver.findElement(By.id("buttoncheck")).click();
 
                        // Find the value of "Get Checked Value" button after selecting 
                        // the option and print the value
                        String postButtonSelected = driver.findElement(By.xpath("//*[@id='easycont']/div/div[2]/div[1]/div[2]/p[3]"))
                                                .getText();
                        System.out.println("Get Checked Value is :"+ postButtonSelected);
                        Thread.sleep(1000);
 
                        // Close the browser
                        driver.close();
            }
}

Output
No Of Radio Button Options :2
Name of Radio Button :Male
Name of Radio Button :Female
First Radio Option is Checked :false
Get Checked Value before selection is Empty
Button Selected is :Male
Get Checked Value is :Radio button 'Male' is checked