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Articles on Trending Technologies
Technical articles with clear explanations and examples
Check the frequency of an element in Java with Collections.frequency
Create a List in Java −List< String >list = Arrays.asList("P", "Q", "R", "P", "T", "P", "U", "V", "W", "X", "W" );Now, let’s say you want to get the frequency of element P. For that, use the Collections.frequency() method −Collections.frequency(list, "P");A shown above, we can find the occurrence of any letter as well −Collections.frequency(list, "T");Exampleimport java.util.Arrays; import java.util.Collections; import java.util.List; public class Demo { public static void main(String[] args) { Listlist = Arrays.asList("P", "Q", "R", "P", "T", "P", "U", "V", "W", "X", "W" ); int checkOccurrence = Collections.frequency(list, "P"); System.out.println("Occurrence of ...
Read MoreThe isEmpty() method of AbstractSequentialList in Java
The isEmpty() method of the AbstractSequentialList class is used to check whether the list is empty or not. If it is empty, then TRUE is returned, else FALSE.The syntax is as follows.public boolean isEmpty()To work with the AbstractSequentialList class in Java, you need to import the following package.import java.util.AbstractSequentialList;The following is an example to implement AbstractSequentialList isEmpty() method in Java.Exampleimport java.util.LinkedList; import java.util.AbstractSequentialList; public class Demo { public static void main(String[] args) { AbstractSequentialList absSequential = new LinkedList(); absSequential.add(110); absSequential.add(320); absSequential.add(400); absSequential.add(550); absSequential.add(600); absSequential.add(700); absSequential.add(900); System.out.println("Elements in ...
Read MoreThe get() method of CopyOnWriteArrayList in Java
The get() method of CopyOnWriteArrayList class returns the element at the specified position in this list.The syntax is as follows:E get(int index)Here, the parameter index is the position from where you want the element.To work with CopyOnWriteArrayList class, you need to import the following package:import java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class get() method in Java:Exampleimport 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); arrList.add(500); arrList.add(650); ...
Read Moreisnormal() in C++
In this section we will see the isnormal() function in C++. This function is present in the cmath library. This function is used to check whether a number is normal or not. The numbers that are considered as non-normal are zeros, infinity or NAN.This function takes float, double or long double values as argument. Returns 1 if the number is normal, otherwise returns 0.Example#include #include using namespace std; int main() { cout
Read MoreCan we create an enum with custom values in java?
Enumeration (enum) in Java is a datatype which stores a set of constant values (Strings in general). You can use enumerations to store fixed values such as days in a week, months in a year etc.enum Days { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY }Custom values to the constantsInstead of declaring just string constants in an enum, you can also have values to these constants as −enum Vehicles { ACTIVA125(80000), ACTIVA5G(70000), ACCESS125(75000), VESPA(90000), TVSJUPITER(75000); }Whenever, you need to assign custom values to the constants of an enum −To hold the value of each ...
Read MoreGet the Current Working Directory in Java
The method java.lang.System.getProperty() is used to obtain the system property. This system property is specified by the key which is the parameter for the method. To obtain the current working directory, the key used is user.dir.A program that demonstrates this is given as follows −Examplepublic class Demo { public static void main(String[] argv) throws Exception { String currentDirectory = System.getProperty("user.dir"); System.out.println("The current working directory is " + currentDirectory); } }The output of the above program is as follows −OutputThe current working directory is c:\JavaProgramNow let us understand the above program.The current working ...
Read MoreCharBuffer hasArray() method in Java
It can be checked if a buffer has the backing of an accessible char array by using the method hasArray() in the class java.nio.CharBuffer. This method returns true if the buffer has the backing of an accessible int array and false otherwise.A program that demonstrates this is given as follows −Exampleimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { CharBuffer buffer = CharBuffer.allocate(5); buffer.put('A'); buffer.put('P'); buffer.put('P'); ...
Read MoreLocalDate until() Method in Java
The difference between two LocalDate objects can be obtained using the until() method in the LocalDate class in Java. This method requires a single parameter i.e. the end date for the LocalDate object and it returns the difference between two LocalDate objects using a Period object.A program that demonstrates this is given as follows:Exampleimport java.time.*; public class Demo { public static void main(String[] args) { LocalDate ld1 = LocalDate.parse("2019-01-10"); LocalDate ld2 = LocalDate.parse("2019-02-14"); System.out.println("The first LocalDate is: " + ld1); System.out.println("The second LocalDate is: " + ld2); ...
Read MoreDoubleStream forEach() method in Java
The forEach() method of the DoubleStream class performs an action for each element of this stream.The syntax is as follows:void forEach(DoubleConsumer action)Here, DoubleConsumer represents an operation that accepts a single double-valued argument and returns no result. The parameter action is a non-interfering action to perform on the elements.To use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;Create a DoubleStream and add some elements to the stream:DoubleStream doubleStream = DoubleStream.of(45.7, 67.8, 89.7, 95.6);Now, display the elements:doubleStream.forEach(System.out::println);The following is an example to implement DoubleStream forEach() method in Java:Exampleimport java.util.stream.DoubleStream; public class Demo { public static void main(String[] args){ ...
Read MoreCharBuffer array() method in Java
A char array for the buffer can be obtained using the method array() in the class java.nio.CharBuffer. If the returned array is modified, then the contents of the buffer are also similarly modified and vice versa. If the buffer is read-only, then the ReadOnlyBufferException is thrown.A program that demonstrates this is given as follows −Exampleimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { CharBuffer buffer = CharBuffer.allocate(n); buffer.put('A'); buffer.put('P'); ...
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