There are many interesting facts with respect to increment and decrement operators in Java. We will discuss a few of them with examples −The increment and decrement operators can’t be used with the ‘final’ variables. This is due to the fact that variables associated with ‘final’ keyword can’t be changed −Example Live Demopublic class Demo{    public static void main(String[] args){       final int my_val = 34;       int my_val_2 = ++my_val;       System.out.println("The value is :");       System.out.println(my_val_2);    } }Output/Demo.java:6: error: cannot assign a value to final variable my_val int my_val_2 ... Read More

There are many facts with respect to array assignment, and we will discuss a few of them with working examples here −While creating array object type, the element that would be present inside the array can be declared as type objects or as child class’s object.Example Live Demopublic class Demo{    public static void main(String[] args){       Number[] my_val = new Number[3];       my_val[0] = new Integer(91);       my_val[1] = new Double(65.963);       my_val[2] = new Double(45.7965);       System.out.println(my_val[0]);       System.out.println(my_val[1]);       System.out.println(my_val[2]);    } }Output91 65.963 ... Read More

Java compiler doesn’t allow abandoning an uninitialized local variable. When a local variable is initialized inside a conditional block, there are 3 possibilities that could potentially occur −Code compiles successfully if values are provided in the conditional block and the given condition is true.Code gives a compilation error if variables are provided (instead of values) in the conditional block and the condition is true.Code gives compilation error if the condition that needs to be checked is false.If the local variable is initialized to a default value outside of the conditional block in the code, it won’t give any error and ... Read More

The HashSet use Hashing to manipulate data. Let us see an example − Example import java.util.*; public class Demo{ private final String f_str, l_str; public Demo(String f_str, String l_str){ this.f_str = f_str; this.l_str = l_str; } public boolean equals(Object o){ if (o instanceof Demo) return true; Demo n = (Demo)o; return n.f_str.equals(f_str) && n.l_str.equals(l_str); } public static void main(String[] args){ ... Read More

Following is the code to implement Checksum using Java −Example Live Demoimport java.util.*; public class Demo{    public static void main(String args[]){       Scanner my_scan = new Scanner(System.in);       System.out.println("Enter the input string ");       String my_in = my_scan.next();       int my_checksum = generate_checksum(my_in);       System.out.println("The checksum that has been generated is " + Integer.toHexString(my_checksum));       System.out.println("Enter the data that needs to be sent to the receiver ");       my_in = my_scan.next();       System.out.println("Enter the checksum that needs to be sent to the receiver "); ... Read More

We can convert a hex string to byte array in Java by first converting the hexadecimal number to integer value using the parseInt() method of the Integer class in java. This will return an integer value which will be the decimal conversion of hexadecimal value. We will then use the toByteArray() method of BigInteger class that will return a byte array.Example Live Demoimport java.math.BigInteger; public class Demo {    public static void main(String args[]) {       String str = "1D08A";       int it = Integer.parseInt(str, 16);       System.out.println("Hexadecimal String " + str);       ... Read More

Implicit is the default waiting time for each test step in our execution. Thus if we keep an implicit wait of ten seconds, each test step will wait for that amount of time for an action to take place and then move to the next step.Implicit wait is a dynamic wait which means if the wait time is ten seconds and the web element on which the next action is to be taken is available at the fifth second, then control will immediately move to the next test step rather than waiting for the full ten seconds.However if the element ... Read More

The differences between get() and navigate() methods are listed below.sl.no.get()navigate()1It is responsible for loading the page and waits until the page has finished loading.It is only responsible for redirecting the page and then returning immediately.2It cannot track the history of the browser.It tracks the browser history and can perform back and forth in the browser.ExampleWith get().import org.openqa.selenium.By; import org.openqa.selenium.Keys; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.chrome.ChromeDriver; import java.util.concurrent.TimeUnit; import java.util.List; public class LaunchBrw {    public static void main(String[] args) {       System.setProperty("webdriver.chrome.driver", "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe");       WebDriver driver = new ChromeDriver();       String url = "https://www.tutorialspoint.com/index.htm"; ... Read More

We are given with a number let’s say, num and the task is to calculate the divisor of a given number thereby count the divisors of num that have at least one digit common with n.Input − num = 24Output − Count is 4Explanation − we will perform the following steps −Firstly, calculate the divisors of a given numberDivisors of 24 are − 1, 2, 3, 4, 6, 8, 12, 24Secondly, check which divisor have at least one digit that matches with the digits of a number2, 4, 12, 24 are the divisors that contain the digit that matches with ... Read More

The javafx.scene.XYChart class is the base class of all the charts that are plotted in an x-y pane. By instantiating the subclasses of this class you can create various XY charts namely − line chart, area chart, bar chart, pie chart, bubble chart, scatter chart, etc.In the XY chart, the given data points are plotted on an XY plane. Along the x and y axes, you will have the tick marks and labels. The labels specify the names (or numbers) of the values.Changing the color of the tick marksThe javafx.scene.chart.Axis class (abstract) is the base class of all the axes ... Read More