[java] How to switch to the new browser window, which opens after click on the button?

If you have more then one browser (using java 8)

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class TestLink {

  private static Set<String> windows;

  public static void main(String[] args) {

    WebDriver driver = new FirefoxDriver();
    driver.get("file:///C:/Users/radler/Desktop/myLink.html");
    setWindows(driver);
    driver.findElement(By.xpath("//body/a")).click();
    // get new window
    String newWindow = getWindow(driver);
    driver.switchTo().window(newWindow);

    // Perform the actions on new window
    String text = driver.findElement(By.cssSelector(".active")).getText();
    System.out.println(text);

    driver.close();
    // Switch back
    driver.switchTo().window(windows.iterator().next());


    driver.findElement(By.xpath("//body/a")).click();

  }

  private static void setWindows(WebDriver driver) {
    windows = new HashSet<String>();
    driver.getWindowHandles().stream().forEach(n -> windows.add(n));
  }

  private static String getWindow(WebDriver driver) {
    List<String> newWindow = driver.getWindowHandles().stream()
        .filter(n -> windows.contains(n) == false).collect(Collectors.toList());
    System.out.println(newWindow.get(0));
    return newWindow.get(0);
  }

}

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