Programming Articles - Page 3315 of 3366

This is a static method of the class named Integer it accepts an integer parameter and Parses it as a signed decimal integer. Example Live Demo public class IntegerDemo { public static void main(String[] args) { // parses the string argument int a = Integer.parseInt("12"); int b = Integer.parseInt("26"); int c = Integer.parseInt("54"); int m = a * b * c; System.out.print("Value after multiplying = " + m); } } Output Value after multiplying = 16848

The this is a keyword in Java which is used as a reference to the object of the current class. Using it you can − Differentiate the instance variables from local variables if they have same names, within a constructor or a method. Call one type of constructor (parametrized constructor or default) from other in a class. It is known as explicit constructor invocation. Example class Superclass { int age; Superclass(int age) { this.age = age; } public void ... Read More

No, interfaces can’t have constructors for the following reasons − All the members of an interface are abstract, and since a constructor cannot be abstract. Still, if you try to write a constructor within an interface it will generate a compile time error. Example public interface InterfaceTest { InterfaceTest(){ } public abstract void display(); public abstract void show(); } Error C:\Sample>javac InterfaceTest.java InterfaceTest.java:2: error: expected public InterfaceTest(){ ^ 1 error

The super keyword is similar to this keyword. Following are the scenarios where a super keyword is used. It is used to differentiate the members of superclass from the members of the subclass if they have same names. It is used to invoke the superclass constructor from the subclass. Whenever you want to call the constructor of the superclass from a method or another constructor you can do so as: Example class Person { Person(String name) { System.out.println("Hello "+ name); } } class Student ... Read More

When working with files in Python, it's often useful to sort them based on their creation time. For example, to find the most recently added file or to process files in the order they were created then we need sort them by the creation date. Python provides built-in methods such as os and os.path which makes it easy to retrieve file metadata and sort directory contents accordingly. In this article, we will explore all the different method to sort the directories based on the creation date in Python - Using os.listdir() with sorted() and os.path.getctime() ... Read More

You can declare an array just like a variable −int myArray[];You can create an array just like an object using the new keyword −myArray = new int[5];You can initialize the array by assigning values to all the elements one by one using the index −myArray [0] = 101; myArray [1] = 102;You can access the array element using the index values −System.out.println("The first element of the array is: " + myArray [0]); System.out.println("The first element of the array is: " + myArray [1]); Alternatively, you can create and initialize an array using the flower braces ({ }): Int [] myArray = {10, 20, 30, 40, 50}

A portable method of interacting with the operating system is offered through the OS Python Module. This module is a part of the default Python library, which contains tools for locating and modifying the working directory. When we are working in the Python shell or scripting environment, it's important to know which directory we're currently working in. This is known as the current working directory. We can change the current working directory to navigate our file system programmatically. In this article, we will see how to change the current working directory in the Python shell. Getting the current working directory ... Read More

In Python programming, it is important to check whether a given path points to a file or a directory. This check is very useful before performing operations such as reading, writing or listing contents. In this article, we’ll see the different methods to identify file types using Python. Why should we check the file type? Before interacting with a file path, it is important to confirm the type of the file to make sure that the code behaves as expected. If the code treats a directory as a file or file as a directory, it can cause errors or data ... Read More

Default constructors in Java:A constructor initializes an object when it is created. It has the same name as its class and is syntactically similar to a method. However, constructors have no explicit return type. There are two types of constructors namely −parameterized constructors − Constructors with arguments.no-arg constructors − Constructors without arguments.Example Live Demopublic class Sample{    int num;    Sample(){       num = 100;    }    Sample(int num){       this.num = num;    }    public static void main(String args[]){       System.out.println(new Sample().num);       System.out.println(new Sample(1000).num);    } }Output100 1000Default ConstructorIt ... Read More

When working with files in Python programming, the common tasks we can perform are reading data, writing logs or processing content. If the files are not managed in a proper way then it leads to issues such as resource leaks, file corruption or unexpected errors. In this article, we'll explore the different ways to safely open and close files in Python. Why file safety is important? When we open a file in python then the operating system will allocate resources to handle the file. If the file is not closed correctly, then those resources might not be released properly which ... Read More