Programming Articles - Page 3316 of 3363

Canonical name of a Java class is the name of the class along with the package. For example, the canonical name of the class File is java.io.File. You can also get the canonical name of a particular class using Java method. The class named Class provides a method getCanonicalName(), this method returns canonical name of the current class. Example Live Demo import java.lang.*; public class ClassDemo { public static void main(String[] args) { ClassDemo c = new ClassDemo(); Class cls = c.getClass(); ... Read More

To access the members of a class from other class. First of all, import the class. Create an object of that class. Using this object access, the members of that class. Suppose there is a class in a package called myPackage with a method named display() package myPackage; public class Sample { public void display() { System.out.println("Hello"); } } You can access it as. import myPackage; public class MyClass { public static void main(String args[]) { Sample s = new Sample(); s.done(); } } Output hello

Curly brackets usually denote sets and ensembles while parenthesis usually in most Algol-based programming languages curly braces are used to declare arrays.

Following is the syntax to declare a class. class className { //Body of the class } You can declare a class by writing the name of the next to the class keyword, followed by the flower braces. Within these, you need to define the body (contents) of the class i.e. fields and methods.To make the class accessible to all (classes) you need to make it public. public class MyClass { //contents of the class (fields and methods) }

The printHexBinary() method of the DatatypeConverter class accepts a byte array and returns a hex string.Exampleimport javax.xml.bind.DatatypeConverter; public class ByteToHexString { public static void main(String args[]) { String sam = "Hello how are you how do you do"; byte[] byteArray = sam.getBytes(); String hex = DatatypeConverter.printHexBinary(byteArray); System.out.println(hex); } }Output48656C6C6F20686F772061726520796F7520686F7720646F20796F7520646F

A class in Java is a user-defined datatype, a blueprint, a classification, that describes the behavior/state that the object of its type support. Example public class Dog { String breed; int age; String color; void barking() { } void hungry() { } void sleeping() { } } A class can contain any of the following variable types. Local variables − Variables defined inside methods, constructors or blocks are called local ... Read More

You can contents of a blob into a byte array using the getBytes() method.Exampleimport java.awt.Image; import java.awt.image.BufferedImage; import java.sql.Blob; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; import java.util.Arrays; public class BlobToByteArray { public static void main(String[] args) throws Exception { Image image = new BufferedImage(300, 400, BufferedImage.TYPE_INT_RGB); String JDBC_DRIVER = "com.mysql.jdbc.Driver"; String DB_URL = "jdbc:mysql://localhost/mydb"; String USER = "root"; String PASS = "password"; ... Read More

A two-dimensional array is nothing but an array of one dimensional arrays. Therefore to map a two dimensional array into one dimensional arrays.Create arrays equal to the length of the 2d array and, using for loop store the contents of the 2d array row by row in the arrays created above.Examplepublic class Mapping_2DTo1D {    public static void main(String args[]) {       int [][] array2D = {{7, 9, 8, 5}, {4, 5, 1, 8}, {9, 3, 2, 7}, {8, 1, 0, 9}};       int [] myArray1 = new int[array2D[0].length];       int [] myArray2 = ... Read More

A directory is simply defined as a collection of subdirectories and single files or either one of them. A directory hierarchy is constructed by organizing all the files and subdirectories within a main directory and this is also known as root directory. These subdirectories are separated using a / operator in a directory hierarchy. In python, we have different methods to scan through a directory recursively. In this article we are going to see about each method. Using os.walk() method Using glob.glob() method Using os.listdir() method ... Read More

When we are building Python applications that store or retrieve user-specific files and settings, then we will often need to access the home directory. The home directory is the default location on a computer where user-related data is stored, such as documents, configuration files, and application data. Python provides simple and cross-platform ways of finding the home directory programmatically by making it easy to write code that works on Windows, macOS, and Linux without modifications. In this article, we'll explore the different methods to get the home directory in Python. Using os.path.expanduser("~") The os.path.expanduser() is a function in Python's built-in ... Read More