How to use BaseMatcher class of org.hamcrest package

// open the first tab
driver.get("https://www.google.com");
Thread.sleep(2000);

// open the second tab
driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL + "t");
driver.get("https://www.google.com");
Thread.sleep(2000);

// switch to the previous tab
driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL + "" + Keys.SHIFT + "" + Keys.TAB);
Thread.sleep(2000);

// opens the default browser tab with the first webpage
driver.get("the url 1");
thread.sleep(2000);

// opens the second tab
driver.findElement(By.cssSelector("Body")).sendKeys(Keys.COMMAND + "t");
driver.get("the url 2");
Thread.sleep(2000);

// comes back to the first tab
driver.findElement(By.cssSelector("Body")).sendKeys(Keys.COMMAND, Keys.SHIFT, "{");

String parentHandle = driverObj.getWindowHandle();
public String switchTab(String parentHandle){
    String currentHandle ="";
    Set<String> win  = ts.getDriver().getWindowHandles();   

    Iterator<String> it =  win.iterator();
    if(win.size() > 1){
        while(it.hasNext()){
            String handle = it.next();
            if (!handle.equalsIgnoreCase(parentHandle)){
                ts.getDriver().switchTo().window(handle);
                currentHandle = handle;
            }
        }
    }
    else{
        System.out.println("Unable to switch");
    }
    return currentHandle;
}

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