Java Articles - Page 104 of 540

Let’s suppose we have given an array of integers. The task is to find the index of a particular element in the given array. For example, Input-1 −N = 8 A[ ] = { 1, 2, 4, 3, 3, 1, 1, 5}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus the output is ‘1’.Input-2 −N = 6 A[ ] = {1, 5, 4, 4, 1, 1}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus we can return the output ‘1’.Approach to solve this problemThe given array ... Read More

Let’s suppose we have given an array of unsorted integers. The task is to find the positive missing number which is not present in the given array in the range [0 to n]. For example, Input-1 −N = 9 arr = [0, 2, 5, 9, 1, 7, 4, 3, 6]Output −8Explanation − In the given unsorted array, ‘8’ is the only positive integer that is missing, thus the output is ‘8’.Input-2 −N = 1 arr = [0]Output −1Explanation − In the given array, ‘1’ is the only one positive integer which is missing, thus the output is ‘1’.Approach to solve ... Read More

Suppose we’ve two strings ‘a’ and ‘b’, the task is to find whether we can obtain string ‘b’ by rotating string ‘a’ exactly by 2 places in an anticlockwise or clockwise direction. For example, Input-1 −a = google b = legoogOutput −TrueExplanation − String ‘google’ can be rotated in an anticlockwise direction by two places, which results in the string ‘legoog’. Thus, we return True.Input-2 −a = tuorialst b = tutorialsOutput −FalseExplanation − String ‘tuorialst’ cannot be rotated by two places in any direction to get another string ‘tutorials’. Thus, we return False.The approach used to solve this problemFor the ... Read More

Given two strings str_1 and str_2. The goal is to count the number of occurrences of substring str2 in string str1 using a recursive process.A recursive function is the one which has its own call inside it’s definition.If str1 is “I know that you know that i know” str2=”know”Count of occurences is − 3Let us understand with examples.For ExampleInputstr1 = "TPisTPareTPamTP", str2 = "TP";OutputCount of occurrences of a substring recursively are: 4ExplanationThe substring TP occurs 4 times in str1.Inputstr1 = "HiHOwAReyouHiHi" str2 = "Hi"OutputCount of occurrences of a substring recursively are: 3ExplanationThe substring Hi occurs 3 times in str1.Approach used ... Read More

We can scroll down with Selenium. Selenium is unable to handle scrolling directly. It takes the help of the Javascript Executor to perform the scrolling action up to an element.First of all we have to locate the element up to which we have to scroll to. Next, we shall use the Javascript Executor to run the Javascript commands. The method executeScript is used to run Javascript commands in Selenium. We shall take the help of the scrollIntoView method in Javascript and pass true as an argument to the method.SyntaxWebElement elm = driver.findElement(By.name("name")); ((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView(true);", elm);Exampleimport org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; ... Read More

We can simulate a Print screen button with Selenium. The screenshot is captured with the Print screen button. Capturing a screenshot is a three way process. It is an important step towards failure analysis.We shall convert the driver object to TakeScreenshot interface.SyntaxTakesScreenshot s = (TakesScreenshot)driver;Then, with the getScreenshotAs method we shall have an image file and copy that file to a location with FileUtils.copyFile method.SyntaxFile sp=s.getScreenshotAs(OutputType.FILE); FileUtils.copyFile(sp, new File("path of image file"));Exampleimport org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.OutputType; import org.openqa.selenium.TakesScreenshot; import org.apache.commons.io.FileUtils; import java.io.File; public class PrintScreenSimulate {    public static void main(String[] args) {     ... Read More

We can clear browser cookies in Selenium. The method deleteCookieNamed shall delete a cookie with a specific name. The cookie named is passed as an argument to the method. First, we will add a cookie, then get it and finally delete it.Syntaxdriver.manage().deleteCookieNamed("foo");Another method called the deleteAllCookies deletes all cookies from the existing domain. First, we will add the cookies, then get and delete them.Syntaxdriver.manage().deleteAllCookies();Exampleimport java.util.Set; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; import java.util.concurrent.TimeUnit; public class DeleteCookiesViaName{    public static void main(String[] args) {       System.setProperty("webdriver.chrome.driver",       "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");       WebDriver driver = new ChromeDriver();   ... Read More

We can switch tabs using Selenium. First we have to open a link in a new tab. The Keys.chord method along with sendKeys is to be used. The Keys.chord method allows you to pass more than one key at once. The group of keys or strings are passed as arguments to the method.We shall pass Keys.CONTROL and Keys.ENTER as arguments to the Keys.chord method. The whole string is then passed as an argument to the sendKeys method. Finally, the sendKeys method has to be applied on the link which is identified by driver.findElement method.SyntaxString clickl = Keys.chord(Keys.CONTROL, Keys.ENTER); driver.findElement(By.xpath("//*[text()='Terms of ... Read More

We can capture browser logs with Selenium. We have to type cast the RemoteWebDriver to driver and then initialize it. Next, we have to use the setLogLevel method. The import org.openqa.selenium.remote.RemoteWebDriver statement needs to be added in code for the RemoteWebDriver.Syntax((RemoteWebDriver) driver).setLogLevel(Level.INFO);Exampleimport org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.remote.RemoteWebDriver import java.util.logging.Level; public class BrwLogs{    public static void main(String[] args) {       System.setProperty("webdriver.chrome.driver",       "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");       WebDriver driver = new ChromeDriver();       // Enable logging with setLogLevel method       ((RemoteWebDriver) driver).setLogLevel(Level.INFO);       driver.get("https://www.tutorialspoint.com/index.htm");       ... Read More

We can handle authentication popup with Selenium. To do this, we have to pass the user credentials within the URL. We shall have to add the username and password to the URL.Syntaxhttps://username:password@URL https://admin:admin@the−nternet.herokuapp.com/basic_auth Here, the admin is the username and password. URL − www.the-internet.herokuapp.com/basic_authLet us work and accept the below authentication popup.Exampleimport org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; public class AuthnPopup{    public static void main(String[] args) {       System.setProperty("webdriver.chrome.driver",       "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");       WebDriver driver = new ChromeDriver();       String u = "admin";       // adding username, password with ... Read More