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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to convert Float array list to float array in Java?
Let us first create a float array list −ArrayList < Float > arrList = new ArrayList < Float > (); arrList.add(5.2 f); arrList.add(10.3 f); arrList.add(15.3 f); arrList.add(20.4 f);Now, convert the float array list to float array. At first, we have set the same size to float array i.e. the same number of elements. After that, we have assigned each value −final float[] arr = new float[arrList.size()]; int index = 0; for (final Float value: arrList) { arr[index++] = value; }Exampleimport java.util.ArrayList; public class Demo { public static void main(String[] args) { ArrayListarrList = new ArrayList(); ...
Read MoreHow can I generate random booleans in Java?
To generate random booleans like TRUE or FALSE, at first create a new Random object −Random randNum = new Random();Now, loop through the count of booleans you want and generate random booleans with nextBooleans() method −for (int i = 1; i
Read MoreRemoving an element from C++ std::vector<> by index?
Remove an element from C++ std::vector by index can be done by following way −Example#include #include using namespace std; int main() { vector v; //declare vector //insert elements into vector v.push_back(-10); v.push_back(7); v.push_back(6); // Deletes the first element (v[0]) v.erase(v.begin() ); for (int i = 0; i < v.size(); i++) cout
Read MoreConcurrentSkipListSet in Java
The ConcurrentSkipListSet has elements that are sorted by default. Also, its implementation is based on the ConcurrentSkipListMap. The ConcurrentSkipListSet class also implements the Collection interface as well as the AbstractSet class. It is a part of the Java Collection Framework.A program that demonstrates this is given as follows −Exampleimport java.util.concurrent.ConcurrentSkipListSet; public class Demo { public static void main(String[] args) { ConcurrentSkipListSet csls = new ConcurrentSkipListSet(); csls.add(7); csls.add(4); csls.add(1); csls.add(9); csls.add(3); System.out.println("The elements in ConcurrentSkipListSet are: " + csls); ...
Read MoreArrayBlockingQueue drainTo() Method in Java
The drainTo() method of the ArrayBlockingQueue class removes all available elements from this queue and adds them to the given collection. It returns the number of elements transferred.The syntax is as followsint drainTo(Collection
Read MoreDoubleStream sum() method in Java
The sum() method of the DoubleStream class in Java returns the sum of elements in this stream.The syntax is as followsdouble sum()To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create DoubleStream and add some elementsDoubleStream doubleStream = DoubleStream.of(23.6, 45.3, 59.6, 60.6, 73.6, 84.7, 94.8);Now, sum the elements of the streamdouble sum = doubleStream.sum(); The following is an example to implement DoubleStream sum() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(23.6, 45.3, 59.6, 60.6, 73.6, 84.7, 94.8); ...
Read MoreDoubleStream noneMatch() method in Java
The noneMatch() method of the DoubleStream class returns true if none of the elements of this stream match the provided predicate.The syntax is as followsboolean noneMatch(DoublePredicate predicate)Here, predicate is a stateless predicate to apply to elements of this stream. To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create DoubleStream and add some elements to the streamDoubleStream doubleStream = DoubleStream.of(15.8, 28.7, 35.7, 48.1, 78.9);Now, TRUE is returned if none of the element match the conditionboolean res = doubleStream.noneMatch(num -> num > 90); The following is an example to implement DoubleStream noneMatch() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public ...
Read MoreJava Program to find keys from a Linked HashMap and store it in a list
Let us first create a LinkedHashMap with key-value pair −Mapmap = new LinkedHashMap(); map.put("1", "Katie"); map.put("2", "Peter"); map.put("3", "Amy"); map.put("4", "Kane"); map.put("5", "Colin"); map.put("6", "Andre"); map.put("7", "Pollard"); map.put("8", "David"); map.put("9", "Jofra"); map.put("10", "Akila");Now, create a new List and store the keys in it for the above Map −Listlist = new ArrayList(); list.addAll(map.keySet());Exampleimport java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; public class Demo { public static void main(String[] args) { Mapmap = new LinkedHashMap(); map.put("1", "Katie"); map.put("2", "Peter"); map.put("3", "Amy"); map.put("4", "Kane"); ...
Read MoreSecureRandom getInstance() method in Java
A SecureRandom object can be obtained using the getInstance() method in class java.security.SecureRandom. This SecureRandom object is useful in implementing the Random Number Generator (RNG) algorithm that is specified.The getInstance() method requires a single parameter i.e. the Random Number Generator (RNG) algorithm and it returns the SecureRandom 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 { SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG"); String s = "Apple"; byte[] arrB = s.getBytes(); ...
Read MoreUse static Import for sqrt() and pow() methods in class Math in Java
Static import means that the fields and methods in a class can be used in the code without specifying their class if they are defined as public static.The Math class methods sqrt() and pow() in the package java.lang are static imported. A program that demonstrates this is given as follows:Exampleimport static java.lang.Math.sqrt; import static java.lang.Math.pow; public class Demo { public static void main(String args[]) { double num = 4.0; System.out.println("The number is: " + num); System.out.println("The square root of the above number is: " + sqrt(num)); System.out.println("The ...
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