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The Enhanced Entity Relationship Model contains all the features of the Entity Relationship model. In addition to all that, it also contains features of Subclasses, Superclasses and Inheritance.All of these in detail are as follows −SubclassesA subclass is a class derived from the superclass. It inherits the properties of the superclass and also contains attributes of its own. An example is:Car, Truck and Motorcycle are all subclasses of the superclass Vehicle. They all inherit common attributes from vehicle such as speed, colour etc. while they have different attributes also i.e Number of wheels in Car is 4 while in Motorcycle ... Read More
Python provides a python shell which is used to execute a single Python command and display the result. It is also called REPL. REPL stands for Read, Evaluate, Print and Loop. The command is read, then evaluated, afterwards the result is printed and looped back to read the next command.Sometimes after executing so many commands and getting haphazard output or having executed some unnecessary commands, we may need to clear the python shell. If the shell is not cleared, we will need to scroll the screen too many times which is inefficient. Thus, it is required to clear the python ... Read More
According to Oracle's Javadocs −Default methods enable you to add new functionality to the interfaces of your libraries and ensure binary compatibility with code written for older versions of those interfaces.A static method is a method that is associated with the class in which it is defined rather than with any object. Every instance of the class shares its static methods.Static method in interface are part of the interface class can’t implement or override it whereas class can override the default method.Sr. No.KeyStatic Interface MethodDefault Method1BasicIt is a static method which belongs to the interface only. We can write implementation ... Read More
The getProperty(String key) method in Java is used to returns the system property denoted by the specified key passed as its argument.It is a method of the java.lang.System Class.Declaration − The java.lang.System.getProperty(String key) is declared as follows −public static String getProperty(String key)where key is the name of the System property.Some values of the key are as follows −file.separatorjava.specification.versionjava.vm.versionjava.class.pathjava.vendorjava.class.versionos.archjava.compilerline.separatorjava.versionjava.vendor.urlos.nameLet us see a program showing the use of getProperty() method in Java −Example Live Demopublic class Example { public static void main(String[] args) { System.out.println("System property: " + System.getProperty("user.dir")); System.out.println("Operating System: " + System.getProperty("os.name")); ... Read More
In Python, there are several ways to input a string from the user. The most common method is by using the built-in function input(). This function allows the user to enter a string, which is then stored as a variable for use in the program. ExampleHere's an example of how to input a string from the user in Python −# Define a variable to store the input name = input("Please enter your name: ") # Print the input print("Hello, " + name + "! Good to see you.") OutputThe above code generates the following output for us −Please enter your name: ... Read More
In this tutorial, we will learn to count JavaScript array objects. The array is the data structure containing the strings, numbers, objects, etc., in JavaScript. The object is the one kind of entity that contains properties and methods related to it. We can access the object's properties and invoke the object method using the object's references. Generally, To find the array length, we can use the array.length() method and it returns the total number of elements that the array includes. But what if we need to count only object elements? Here, this tutorial has various approaches to counting the total ... Read More
We can type Enter/Return key in Selenium. We shall use the sendKeys method and pass Keys. ENTER as an argument to the method. Also, we can use pass Keys. RETURN as an argument to the sendKeys method for the same purpose.To use the Keys class, we have to incorporate import org.openqa.selenium.Keys to the code. Let us type Enter/Return after inputting text within the below edit box.Exampleimport org.openqa.selenium.WebDriver; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.By; import org.openqa.selenium.Keys; public class TypeEnter{ public static void main(String[] args) { System.setProperty("webdriver.chrome.driver", "C:\Users\ghs6kor\Desktop\Java\chromedriver.exe"); WebDriver driver = new ... Read More
Suppose we have a complex number class with real and imaginary part. We shall have to overload the addition (+) operator to add two complex number. We also have to define a function to return complex number in proper representation.So, if the input is like c1 = 8 - 5i, c2 = 2 + 3i, then the output will be 10 - 2i.To solve this, we will follow these steps −Overload the + operator and take another complex number c2 as argumentdefine a complex number called ret whose real and imag are 0real of ret := own real + real ... Read More
Intel 8051 is an 8-bit microcontroller. It has many powerful instructions and IO accessing techniques. In this section, we will see one of the simplest program using 8051.Here we will add two8-bit numbers using this microcontroller. The register A(Accumulator) is used as one operand in the operations. There are seven registers R0 – R7 in different register banks. We can use any of them as the second operand.We are taking two number 5FH and D8H at location 20H and 21H, After adding them, the result will be stored at location 30H and 31H. AddressValue...20H5FH21HD8H...30H00H31H00H...ProgramMOVR0, #20H;set source address 20H to R0 ... Read More
Cache memory, often known as cache, is a different memory system in a computer that stores frequently used data and instructions for a short period. While loading a website, the browser we are using will automatically cache some resources, such as images, scripts, and stylesheets, to be utilized again when the page is reloaded. This can shorten the time it takes for a website to load not only that but also it helps to lower the amount of data that has to be sent over the network. But this cache memory stored by the browser also has some disadvantages. If ... Read More