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Articles on Trending Technologies
Technical articles with clear explanations and examples
Can a for statement loop infinitely in java?
Using loops in programming languages we can execute a set of statements repeatedly. Java provides various loops namely while loop, for loop and the do while loop.The for statement contains an initialization statement, a condition and, an increment or decrement operation.Initializing statement − The initialization determines the starting value of the loop.Condition − The condition in for loop is a statement returning a boolean value. This condition determines the exit value of the loop. It is executed before the statements of the loop.Increment and decrement − Using this the loop will be incremented or decremented to the next value.After initializing ...
Read MoreAlgorithmParameterGenerator getAlgorithm() method in Java
The algorithm name for the parameter generator can be obtained using the method getAlgorithm() in the class java.security.AlgorithmParameterGenerator. This method requires no parameters and it returns the algorithm name in string form.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 { AlgorithmParameterGenerator apGenerator = AlgorithmParameterGenerator.getInstance("DiffieHellman"); apGenerator.init(1024); String algorithm = apGenerator.getAlgorithm(); System.out.println("The Algorithm is: " + algorithm); } catch (NoSuchAlgorithmException e) { ...
Read MoreConvert Character Array to IntStream in Java
Let’s say the following is our character array:Character arr[] = { 'V', 'e', 'h', 'i', 'c', 'l' , 'e' };To convert the above character array to IntStreamIntStream stream = Stream.of(arr).flatMapToInt(IntStream::of);We have used the flatMapToInt() method for this.The following is an example to convert character array to IntStream in Java:Exampleimport java.util.stream.*; public class Main { public static void main(String[] args) { Character arr[] = { 'V', 'e', 'h', 'i', 'c', 'l' , 'e' }; System.out.println("The character array = "); for (char value : arr) { System.out.println("Value = ...
Read MoreWhat is deep copy? Explain with an example in Java.
Creating an exact copy of an existing object in the memory is known as cloning.The clone() method of the class java.lang.Object accepts an object as a parameter, creates and returns a copy of it (clones).In order to use this method, you need to make sure that your class implements the Cloneable interface.Exampleimport java.util.Scanner; public class CloneExample implements Cloneable { private String name; private int age; public CloneExample(String name, int age){ this.name = name; this.age = age; } public void displayData(){ System.out.println("Name : "+this.name); ...
Read MoreThe contains() method of CopyOnWriteArrayList in Java
The contains() method of the CopyOnWriteArrayList class is used to get the specified element. It returns TRUE if the element is in the List, else FALSE is returned.The syntax is as followsboolean contains(Object ob)Here, ob is the element to be checked for existence. 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 contains() method in JavaExampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(100); arrList.add(250); arrList.add(400); ...
Read MoreWhy do we pass a Pointer by Reference in C++?
If we need to modify a pointer rather than the object that the pointer is pointing to, we pass a pointer by reference.Here is an example of how to pass a pointer by reference −Example#include using namespace std; void Decrement( int*& d ) { --d; } int main( void ) { int a = 26; int* ptr = &a; // pointer to pass // print before decrement cout
Read MoreConvert String to IntStream in Java
If you have a string and you want to convert it into IntStream with ASCII values, then it can be easily achieved using the below code.To work with IntStream class, you need to import the following package:import java.util.stream.IntStream;Let’s say the following is our string:String str = "Benz";Convert the above string to IntStream:IntStream stream = str.chars();The following is an example to convert String to IntStream in Java:Exampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { String str = "Benz"; System.out.println("String to be converted = " + str); System.out.println("String ...
Read MoreProvider entrySet() method in Java
The entries in the Provider have an unmodifiable set view that can be obtained using the method entrySet() in the class java.security.Provider. This method requires no parameters and it returns the unmodifiable set view for the entries in the Provider.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 { SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG"); Provider p = sRandom.getProvider(); Set set = p.entrySet(); Iterator i = set.iterator(); ...
Read MoreWhat is the importance of "Java.lang.Class" in Java?
The java.lang.Class is one of the most important class in Java and it can provide several utility methods like getClass(), forName() which is used to find and load a class. It can also provide methods like Class.newInstance() which is the backbone of reflection and allow us to create an instance of a class without using new() operator.Importance of java.lang.ClassInstances of the class Class represent classes, interfaces, enum and annotation in a running Java application.Whenever a java file is compiled, the compiler will insert a public, static, final field named Class of the type java.lang.Class into generated .class fileEach and every class exposes its code in the form of an ...
Read MoreThe add() method of CopyOnWriteArrayList in Java
Two types of add() methods are available in the CopyOnWriteArrayList class: add(E e) methodTo add elements in CopyOnWriteArrayList class in Java, use the add() method. Here, the element is appended to the end of the list.The syntax is as followsboolean add(E e)Here, the parameter e is the element to be appended to this list.To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to add elements in the CopyOnWriteArrayList class in JavaExampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); ...
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