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Articles by karthikeya Boyini
Page 63 of 142
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 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 MoreNavigableSet Class lower() method in Java
The lower() method of NavigableSet returns the greatest element strictly less than the given element i.e. 35 here −lower(35);The following is an example to implement the lower() method in Java −Exampleimport java.util.NavigableSet; import java.util.TreeSet; public class Demo { public static void main(String[] args) { NavigableSet set = new TreeSet(); set.add(10); set.add(25); set.add(40); set.add(55); set.add(70); set.add(85); set.add(100); System.out.println("Returned Value = " + set.lower(35)); } }OutputReturned Value = 25
Read MoreRetrieve environment variables with Java Map Collection
First, use the getenv() method to get the environment variables −System.out.println("PATH = " + System.getenv("PATH"));Now, get the key and value. Loop through to get the list of environment variables −Map e = System.getenv(); for (Iterator i = e.entrySet().iterator(); i.hasNext();) { Map.Entry mapEntry = (Map.Entry) i.next(); System.out.println(mapEntry.getKey() + " = " + mapEntry.getValue()); }The following is an example to retrieve environment variables with Map Collection −Exampleimport java.util.Iterator; import java.util.Map; public class Demo { public static void main(String args[]) { System.out.println("PATH = " + System.getenv("PATH")); ...
Read MoreHow to initialize a vector in C++?
Initialization vector can be done in many ways1) Initialize a vector by push_back() methodAlgorithmBegin Declare v of vector type. Call push_back() function to insert values into vector v. Print “Vector elements:”. for (int a : v) print all the elements of variable a. End.Example#include #include using namespace std; int main() { vector v; v.push_back(6); v.push_back(7); v.push_back(10); v.push_back(12); cout
Read MoreCustom ArrayList in Java
A custom ArrayList can have multiple types of data and its attributes in general are based on the user requirements.A program that demonstrates a custom ArrayList is given as follows −Exampleimport java.util.ArrayList; public class CustomArrayList { int n = 5; class Employee { int eno; String name; Employee(int eno, String name) { this.eno = eno; this.name = name; } } public static void main(String args[]) { int eno[] = {101, 102, 103, 104, ...
Read MoreHow to create Java Priority Queue to ignore duplicates?
The simplest way to create a Java Priority Queue to ignore duplicates is to first create a Set implementation −HashSet set = new HashSet (); set.add(100); set.add(150); set.add(250); set.add(300); set.add(250); set.add(500); set.add(600); set.add(500); set.add(900);Now, create Priority Queue and include the set to remove duplicates in the above set −PriorityQueuequeue = new PriorityQueue(set);Exampleimport java.util.HashSet; import java.util.PriorityQueue; public class Demo { public static void main(String[] args) { HashSetset = new HashSet(); set.add(100); set.add(150); set.add(250); set.add(300); set.add(250); set.add(500); ...
Read MoreArrayBlockingQueue Class in Java
A bounded blocking queue that is backed by an array is known as a ArrayBlockingQueue Class in Java. The size of the queue is fixed in the class and it uses FIFO for ordering elements. The ArrayBlockingQueue Class is a member of the Java Collections Framework.A program that demonstrates this is given as follows −Exampleimport java.util.concurrent.ArrayBlockingQueue; public class Demo { public static void main(String[] args) { int n = 10; ArrayBlockingQueue abQueue = new ArrayBlockingQueue(n); abQueue.add(7); abQueue.add(2); abQueue.add(6); abQueue.add(3); ...
Read MoreCharBuffer slice() method in Java
A new CharBuffer with the content as a shared subsequence of the original CharBuffer can be created using the method slice() in the class java.nio.CharBuffer. This method returns the new CharBuffer that is read-only if the original buffer is read-only and direct if the original buffer is direct.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 buffer1 = CharBuffer.allocate(n); buffer1.put('A'); ...
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