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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to execute an external program like windows media player in Java?
Using the Runtime classJava provides a class named java.lang.Runtime, using this class you can interface with the current environment.The getRunTime() (static) method of this class returns a Runtime object associated with the current application.The exec() method accepts a String value representing the command to execute a process in the current environment (system) and executes it.Therefore, to execute an external application using the Runtime class −Get the run time object using the getRuntime() method.Execute the required process by passing the path of it as a String value to the exec() method.Exampleimport java.io.IOException; public class Trail { public static void main(String ...
Read MoreDifference between an Iterator and ListIterator in Java
Java provided these two interfaces to traverse the data one by one stored in a collection. The internal implementation of iterator and list iterator makes them differ apart but the main agenda of both the iterators is the same.The following are the important differences between Iterator and ListIterator.Sr. No.KeyIteratorListIterator1ApplicableIterator can be used to traverse any collection irrespective of the type of collection.List iterator can only be used to iterate only List collection implemented classes like arraylist, linkedlist etc.2CallingAs mentioned Iterator must be used to enumerate elements in all Collections implemented interfaces like Set, List, Queue, Deque and also in all ...
Read MoreCheck if a number has same number of set and unset bits in C++
In this section we will check whether a number has same number of set bits and unset bits or not. Suppose the number 12 is there. Its binary representation is 1100. This has same number of 0s and 1s.The approach is simple. We will check each bit of the number, and if that is 1, then increase set_bit_count, and if it is 0, then increase unset_bit_count. Finally, if they are same, then return true, otherwise false.Example#include using namespace std; bool hasSameSetUnset(int n) { int set_count = 0, unset_count = 0; while(n){ if((n & 1) ...
Read MoreC++ bitset and its application ?
A bitset is a dataset that stores multiple boolean values but takes lesser memory space as compared to other data sets that can store a sequence of bits like a boolean array or boolean vector.Bitsets stores the binary bits in a form that takes less memory space, it stores them in compressed from. Accessing any element is same as others i.e. by using its index value i.e. bitset_name[index]. But the indexing of elements in a bitset is reverse. Let’s take an example, for bitset {01101001} the element at 0th index is 1 and so on. So 0’s are at index ...
Read MoreCheck if a given number is Pronic in C++
Here we will see, how to check whether a number is Pronic number or not. A number that can be arranged to form a rectangle, are called the pronic numbers. First few pronic numbers are: 0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 110, 132, 156, 182, 210, 240, 272, 306, 342. The pronin numbers are product of two consecutive integers. So a pronic number n = x * (x + 1).Here we will check and generate some pronic numbers.Example#include #include using namespace std; bool isPronicNumber(int num) { for (int i = 0; i
Read MoreSort an array of strings according to string lengths in C++
Here we will see how to sort a list of strings based on their lengths. So if a string has less number of characters, then that will be placed first, then other longer strings will be placed. Suppose the strings arestr_list = {“Hello”, “ABC”, “Programming”, “Length”, “Population”}after sorting, they will be −str_list = {“ABC”, “Hello”, “Length”, “Population”, “Programming”}Here we will create our own comparison logic to sort them. That comparison logic will be used in the sort function in C++ STL.Algorithmcompare(str1, str2): Begin if length of str1 < length of str2, then return 1 return ...
Read MoreThe set() method of AbstractList class in Java
The set() method of the AbstractList class is used to replace the element at the specified position in this list with the specified element. It returns the element that gets replaced.The syntax is as follows:public E set(int index, E ele)Here, the parameter index is the index of the element to replace, whereas ele is the element to be stored at the specified position.To work with the AbstractList class, import the following package:import java.util.AbstractList;The following is an example to implement set() method of the AbstractlList class in Java:Exampleimport java.util.LinkedList; import java.util.AbstractList; public class Demo { public static void main(String[] args) ...
Read MoreCan I overload private methods in Java?
Overloading is a one of the mechanisms to achieve polymorphism where, a class contains two methods with same name and different parameters.Whenever you call this method the method body will be bound with the method call based on the parameters.Overloading private methodsYes, we can overload private methods in Java but, you can access these from the same class.Examplepublic class Calculator { private int addition(int a , int b){ int result = a+b; return result; } private int addition(int a , int b, int c){ int result = a+b+c; ...
Read MoreGet file extension name in Java
The file extension is the suffix that is attached to the computer file and it denotes the format of the file. A program that demonstrates getting the file extension name is given as follows −Exampleimport java.io.File; public class Demo { private static String fileExtension(File file) { String name = file.getName(); if(name.lastIndexOf(".") != -1 && name.lastIndexOf(".") != 0) return name.substring(name.lastIndexOf(".") + 1); else return ""; } public static void main(String[] args) { File file = new File("demo1.txt"); ...
Read MoreIntStream peek() method in Java
The peek() method in the IntStream class in Java returns a stream consisting of the elements of this stream. It additionally performs the provided action on each element as elements are consumed from the resulting stream.The syntax is as followsIntStream peek(IntConsumer action)Here, the parameter action is a non-interfering action to perform on the elements as they are consumed from the stream. The IntConsumer represents an operation that accepts a single int-valued argument and returns no result.The following is an example to implement IntStream peek() method in JavaExampleimport java.util.*; import java.util.stream.IntStream; public class Demo { public static void ...
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