Programming Articles - Page 2394 of 3363

The URL class of the java.net package represents a Uniform Resource Locator which is used to point a resource (file or, directory or a reference) in the world wide web.The openStream() method of this class opens a connection to the URL represented by the current object and returns an InputStream object using which you can read data from the URL.Therefore, to read data from web page (using the URL class) −Instantiate the java.net.URL class by passing the URL of the desired web page as a parameter to its constructor.Invoke the openStream() method and retrieve the InputStream object.Instantiate the Scanner class ... Read More

The @JsonAnyGetter annotation enables to use a Map as a container for properties that we want to serialize to JSON and @JsonAnySetter annotation instructs Jackson to call the same setter method for all unrecognized fields in the JSON object, which means that all fields that are not already mapped to a property or setter method in the Java object.Syntaxpublic @interface JsonAnyGetter public @interface JsonAnyGetterExampleimport java.io.*; import java.util.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.annotation.*; public class JsonAnyGetterAndJsonAnySetterTest {    public static void main(String args[]) throws JsonGenerationException, JsonMappingException, IOException {       Employee emp1 = new Employee();       emp1.setFirstName("Adithya");       emp1.setLastName("Sai"); ... Read More

If there are fields in Java objects that do not wish to be serialized, we can use the @JsonIgnore annotation in the Jackson library. The @JsonIgnore can be used at the field level, for ignoring fields during the serialization and deserialization. In this article, we will learn how to ignore the fields during JSON serialization in Java using the Jackson library. Steps to ignore the fields during JSON serialization in Java: In order to use Jackson, you will need to add it to your project. If you use Maven, add the following dependency to your ... Read More

In this article, let's learn how to check for a prime and find the next prime number in Java. Following are the different ways to do so: Using the isPrime() method. Using the nextPrime() method. Manual checking for prime and next prime. Using the isProbablePrime() method The isProbablePrime() is method of the java.math.BigInteger class. It accepts an integer value as a parameter, checks if it is prime or not, and returns true if it is prime, else it returns false. To check if a number is prime using the isPrime() method, follow the steps below: Instantiate the ... Read More

In Java, the System is a class that provides access to the resources called "System resources". It is a final class, which means it cannot be inherited by any other class. It is a part of the java.lang package. The System.out.println() method prints the data on the console. In this article, we will learn how to redirect the output of the System.out.println() method to a file. Following are few of the ways through we achieve this: Using System.setOut() with PrintStream Using FileOutputStream with PrintStream The filed named out of the System class represents a standard output Stream, an ... Read More

To delete all the files in a directory recursively (only files), we can use the class Files, which is part of the java.nio.file package. The Files class helps in performing file operations such as creating, deleting, and copying files. Suppose we have a directory named test with the following structure: file1.txt file2.txt file3.txt subdir1 file4.txt file5.txt subdir2 ... Read More

The given task is to list all the files from a specific directory, recursively, which means we need to retrieve all the files in the main directory and all the subdirectories as well. For example, if we have a directory structure like below - MyDirectory / \ / ... Read More

The interface set does not allow duplicate elements. The add() method of this interface accepts elements and adds to the Set object, if the addition is successful it returns true, if you try to add an existing element using this method, the addition operations fails returning false. Problem Statement Given a file which contains duplicate lines, write a program in Java to read the file, remove duplicate lines, and write the unique lines to a new file. Input Hello how are you Hello how are you welcome to Tutorialspoint Output Hello how are you welcome to Tutorialspoint ... Read More

The replaceAll() method of the String class accepts two strings, One representing a regular expression to find a string and the other representing a replacement string.And, replaces all the matched sequences with the given String. Therefore, to replace a particular word with another in a String −Get the required String.Invoke the replace all method on the obtained string by passing, a regular expression representing the word to be replaced (within word boundaries “\b”) and a replacement string as parameters.Retrieve the result and print it.Exampleimport java.io.File; import java.io.IOException; import java.util.Scanner; public class ReplacingWords {    public static void main(String[] args) throws ... Read More

Built-in reverse() method The StringBuffer class provides you a method named reverse(). It reverses the contents of the current StringBuffer object and returns the resultant StringBuffer object. It is the easiest way to reverse a Sting using Java. To do so − Instantiate the StringBuffer class by passing the required String as a parameter. Invoke the reverse() method od the created object. Convert it into String again using the toString() method. Example public class Sample { public static void main(String args[]) { String str = new String("Hello how are you"); StringBuffer sb = new ... Read More