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Articles on Trending Technologies
Technical articles with clear explanations and examples
A Reluctant qualifier in Java Regular Expressions
The reluctant qualifier starts with the shortest string size as possible. If a match is found by the engine, the process continues to find more matches otherwise the engine adds a character to the searched string section and tries again. This continues until a match is obtained or the string is used up.The regex "B+?" is used to find the match in the string "SkyIsBlue".A program that demonstrates this is given as follows:Exampleimport java.util.regex.Matcher; import java.util.regex.Pattern; public class Demo { public static void main(String args[]) { String regex = "B+?"; String str = ...
Read MoreIntStream findAny() method in Java
The findAny() method of the IntStream class in Java is used to return an OptionalInt describing some element of the stream, or an empty OptionalInt if the stream is empty.The syntax is as follows −OptionalInt findAny()Here, OptionalInt is a container object which may or may not contain an int value.Create an IntStream and add some elements −IntStream intStream = IntStream.of(20, 35, 50, 60, 80, 100);Now, return any of the element of the stream using findAny() in Java −OptionalInt res = intStream.findAny();The following is an example to implement IntStream findAny() method in Java −Exampleimport java.util.*; import java.util.stream.IntStream; public class Demo ...
Read MoreThe listIterator() method of CopyOnWriteArrayList in Java starting at a specified position
The listIterator() method CopyOnWriteArrayList class returns a list iterator over the elements in this list, beginning at the specified position in the list.The syntax is as followspublic ListIterator listIterator(int index)Here, index is the index of the first element to be returned from the list iterator.To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class listIterator() method in Java. We have set the index as 3, therefore, the list would be iterated from index 3Exampleimport java.util.Iterator; import java.util.ListIterator; import java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) ...
Read MoreCan we define a static constructor in Java?
No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur.In general, static means class level. A constructor will be used to assign initial values for the instance variables. Both static and constructor are different and opposite to each other. We need to assign initial values for an instance variable we can use a constructor. We need to assign static variables we can use Static Blocks.Examplepublic class StaticConstructorTest { int x = 10; // Declaratiopn of Static Constructor static StaticConstructorTest() { ...
Read MoreUse a character class in Java Regular Expressions
A character class is set of characters that are enclosed inside square brackets. The characters in a character class specify the characters that can match with a character in an input string for success. An example of a character class is [a-z] which denotes the alphabets a to z.A program that demonstrates a character class in Java Regular Expressions is given as follows:Exampleimport java.util.regex.Matcher; import java.util.regex.Pattern; public class Demo { public static void main(String args[]) { Pattern p = Pattern.compile("[a-z]+"); Matcher m = p.matcher("the sky is blue"); System.out.println("The input string ...
Read MoreKeyPairGenerator getProvider() method in Java
The provider of the key pair object can be obtained using the getProvider() method in the class java.security.KeyPairGenerator. This method requires no parameters and it returns the provider of the key pair object.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); Provider p = kpGenerator.getProvider(); System.out.println("The Provider is: " + p.getName()); } catch (NoSuchAlgorithmException e) { ...
Read MoreThe add() method in Java Stream.Builder
Use the add() method to insert elements in the Stream.Builder. The element to be added is a parameter for the add().The following is the syntax:default Stream.Builder add(T t)Here, t is the element to be added.Import the following package for the Stream.Builder class in Java:import java.util.stream.Stream;At first, create Stream.Builder:Stream.Builder builder = Stream.builder();Now, add elements using add() method:builder.add("This"); builder.add("is"); builder.add("it!");Here is an example displaying how to implement add() method of Stream.Builder in Java:Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) { Stream.Builder builder = Stream.builder(); builder.add("This"); builder.add("is"); ...
Read MoreElaborate the legal operands of the instance of operator in java?
The instanceof operator in Java is used to find whether a reference is an instance of a Type i.e. class or an interface.Examplepublic class InstanceOfExample { public static void main(String args[]) { String str = "hello"; boolean bool = str instanceof String; System.out.println(bool); } }OutputtrueLegal operands of the instanceof operatorThe following are the only legal operands of the instanceof operator −Left operand − It must be a reference representing an object.Right operand − It must be the name of Java class or, interface.Except these two if you use any ...
Read MoreC++ Program for Inorder Tree Traversal without Recursion
If a binary tree is traversed in-order, the left subtree is visited first, then the root and later the right sub-tree. The output the key in ascending order in in_order traversal. This is a C++ Program for Inorder Tree Traversal without Recursion.AlgorithmBegin Function inOrder(): Declare a stack s. Declare the current node as root. While current node is not null and stack is not empty do While current node is not null do Push the current node on the ...
Read MoreKeyPairGenerator getAlgorithm() method in Java
The algorithm name for the key pair generator can be obtained using the method getAlgorithm() in the class java.security.KeyPairGenerator. This method requires no parameters and it returns the algorithm name for the key pair generator.A program that demonstrates this is given as follows −Exampleimport java.security.*; import java.util.*; public class Demo { public static void main(String[] argv) { try { KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA"); String algorithm = kpGenerator.getAlgorithm(); System.out.println("The Algorithm is: " + algorithm); } catch (NoSuchAlgorithmException e) { ...
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