Jackson is a library that is used for converting Java objects to JSON and vice versa. It provides various annotations to customize the serialization and deserialization process. One such annotation is @ConstructorProperties, which is used to specify the properties of a constructor for deserialization. The @ConstructorProperties annotation is from java.beans package, used to deserialize JSON to a Java object via the annotated constructor. If we use this annotation rather than annotating each parameter in the constructor, we can provide an array with the property names for each of the constructor parameters. Let's learn when to use the @ConstructorProperties annotation with ... Read More

The subexpression/metacharacter “\A” matches the beginning of the entire string.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample {    public static void main( String args[] ) {       String regex = "\AHi";       String input = "Hi how are you welcome to Tutorialspoint";       Pattern p = Pattern.compile(regex);       Matcher m = p.matcher(input);       int count = 0;       while(m.find()) {          count++;       }       System.out.println("Number of matches: "+count);    } }OutputNumber of matches: 1Example2Following Java program accepts a string ... Read More

The subexpression/metacharacter “.” matches any single character except a newline.Example1import java.util.regex.Matcher; import java.util.regex.Pattern; public class MatchesAll {    public static void main( String args[] ) {       String regex = ".";       String input = "Hi how are you welcome to Tutorialspoint";       Pattern p = Pattern.compile(regex);       Matcher m = p.matcher(input);       int count = 0;       while(m.find()) {          count++;       }       System.out.println("Number of matches: "+count);    } }OutputNumber of matches: 40Example 2The following Java program accepts 5 ... Read More

The subexpression/metacharacter “$” matches the end of a line.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class EndWith {    public static void main( String args[] ) {       String regex = "Tutorialspoint$";       String input = "Hi how are you welcome to Tutorialspoint";       Pattern p = Pattern.compile(regex);       Matcher m = p.matcher(input);       int count = 0;       while(m.find()) {          count++;          System.out.println("Number of matches: "+count);       }    } }OutputNumber of matches: 1Example 2The following Java program accepts ... Read More

The subexpression/metacharacter “^” matches the beginning of a line. If you use this in a regular expression, it matches the sentence succeeding it in the input string.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample {    public static void main( String args[] ) {       String regex = "^Hi how are you";       String input = "Hi how are you welcome to Tutorialspoint";       Pattern p = Pattern.compile(regex);       Matcher m = p.matcher(input);       int count = 0;       while(m.find()) {          count++;     ... Read More

The com.google.gson.JSonElement class represents an element of Json. We can use the toJsonTree() method of Gson class to serialize an object's representation as a tree of JsonElements. We can add/ insert an additional property to JSON string by using the getAsJsonObject() method of JSonElement. This method returns to get the element as JsonObject.Syntaxpublic JsonObject getAsJsonObject()Exampleimport com.google.gson.*; public class AddPropertyGsonTest {    public static void main(String[] args) {       Gson gson = new GsonBuilder().setPrettyPrinting().create(); // pretty print JSON       Student student = new Student("Adithya");       String jsonStr = gson.toJson(student, Student.class);       System.out.println("JSON String: " + jsonStr);       ... Read More

In this article, we will find the differences between Fail-Fast and Fail-Safe Iterators. They both describe how collections behave when they are modified during iteration. What is an iterator? An Iterator is an object in Java used to cycle through a collection, accessing or removing elements. It can be obtained by using the iterator() method of a collection. What is FailSafe? Fail-safe also called a Non-Fail-fast Iterator, does not throw ConcurrentModificationException. It works on a copy of the collection. Any changes made in the iterator only affect the copy but not the original collection. Example The following is an ... Read More

In this article, we will find the differences between volatile and Transient. Both have a different purpose for specifying before a variable. These modifiers are important in determining the behavior and characteristics of variables in different cases. What is volatile? A volatile keyword is used in a multithreading environment where two threads reading and writing the same variable simultaneously. The volatile keyword flushes the changes directly to the main memory instead of the CPU cache.  Example of Volatile The following is an example of Volatile in Java: public class VolatileExmaple extends Thread { volatile boolean isRunning ... Read More

In Java, List and Set are both interfaces that belong to the Collection framework. Both interfaces extend the Collection interface. They are both used to store a collection of objects as a single unit. Before JDK 1.2, we used to use Arrays, Vectors, and Hashtable for grouping objects as a single unit. Difference Table The following are the key differences between List and Set − Sr. No. ... Read More

String buffer and StringBuilder both are mutable classes which can be used to do operation on string objects such as reverse of string, concating string and etc. We can modify a string without creating a new object of the string. A string buffer is thread-safe whereas string builder is not thread-safe. Therefore, it is faster than a string buffer. Also, a string concat + operator internally uses StringBuffer or StringBuilder class. Below are the differences. What is StringBuilder? The StringBuilder class in java is used to create and change a sequence of characters. In a regural string once the characters ... Read More