Using Lambda Expression for switching windows in Selenium Using Java

Question

for (String winHandle : driver.getWindowHandles()) 
{
    driver.switchTo().window(winHandle); 
}

Can we rewrite this using Lambda Expression?

Is it really required to execute driver.switchTo() again in every loop iteration? If not, you can simply use driver.getWindowHandles().forEach(driver.switchTo()::window) — Holger
– Holger, Commented Feb 10, 2017 at 17:38

Community · Accepted Answer · 2017-05-23 12:17:02Z

2

I would go for

driver.getWindowHandles().forEach(windowHandle -> {
    driver.switchTo().window(windowHandle);
});

which is equivalent to:

for(String windowHandle : driver.getWindowHandles()) {
    driver.switchTo().window(windowHandle);
}

forEach method calls can be used for Collections. You can go parallel with the usage of forEach together with parallelStream. Read further.

CommunityBot

11 silver badge

answered Feb 2, 2017 at 10:59

4,5964 gold badges25 silver badges39 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Some explanation might help.

@Pavlo, added explanation.

mirzak · Accepted Answer · 2017-02-02 12:28:32Z

0

You can do it like

driver.getWindowHandles().stream().forEach((i) -> {
     driver.switchTo().window(i);
});

or like

driver.getWindowHandles().parallelStream().forEachOrdered((i) -> {
     driver.switchTo().window(i);
});

Stream api offers other possibilities that can make your life easier.

answered Feb 2, 2017 at 12:28

mirzak

1,0695 gold badges15 silver badges32 bronze badges