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Programming Articles
Page 1504 of 2547
Shuffle vs random_shuffle in C++
Here we will see the Shuffle and random_shuffle in C++. Let us see the random_shuffle first. It is used to randomly rearrange the elements in range [left, right). This function randomly swaps the positions of each element with the position of some randomly chosen positions.We can provide some random generator function to tell which element will be taken in every case. If we do not provide some, it will use its own random generator function.Example#include using namespace std; int myRandomGenerator(int j) { return rand() % j; } main() { srand(unsigned(time(0))); vector arr; for (int j ...
Read MoreBind function and placeholders in C++
Here we will see the Bind function and the placeholders in C++. Sometimes we need to manipulate the operation of some functions as we need. We can use some default parameters to get some essence of manipulating.In C++11, one new feature is introduced, called the bind function. This helps us to do such manipulating in some easier fashion. To use these features, we have to use header file.Bind functions with the help of placeholders helps to determine the positions, and number of arguments to modify the function according to desired outputs.Placeholders are namespaces which detect the position of a ...
Read MoreHow to use subSet() method of Java NavigableSet Class
Use the subset() method to get elements from a limit. At first, create NavigableSet and add elements −NavigableSet set = new TreeSet(); set.add(10); set.add(25); set.add(40); set.add(55); set.add(70); set.add(85);Now, use the subset() method −set.subSet(40, 85)The following is an example to implement subset() method of Java NaviagbleSet class −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.subSet(40, 85)); } }OutputReturned Value = [40, 55, 70]
Read MoreC++ Program to Perform Searching Based on Locality of Reference
Searching based on locality of reference, depends upon the memory access pattern data elements are reallocated.Here linear searching method is used to search an element.AlgorithmBegin int find(int *intarray, int n, int item) intialize comparisons = 0 for i = 0 to n-1 Increase comparisons if(item == intarray[i]) Print element with its index break if(i == n-1) Print element not found return -1 Print Total comparisons For j = i till i>0 intarray[j] = intarray[j-1] intarray[0] = ...
Read MoreExplain about field hiding in java?
Whenever you inherit a superclass a copy of superclass’s members is created at the subclass and you using its object you can access the superclass members.If the superclass and the subclass have instance variable of same name, if you access it using the subclass object, the subclass field hides the superclass’s field irrespective of the types. This mechanism is known as field hiding.But, since it makes code complicated field hiding is not recommended.ExampleIn the following example we have two classes Super and Sub one extending the other. They both have two fields with same names (name and age).When we print ...
Read MoreJava Program to create a new list with values from existing list with Function Mapper
To create a new list with values from fields from existing list with Function Mapper, the following is an example. Here, we have a class Employee −class Employee { private String emp_name; private int emp_age; private String emp_zone; }The following is an example that creates a new list from existing with Function Mapper −Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.function.Function; public class Demo { public static void main(String args[]) { List < Employee > emp = Arrays.asList(new Employee("Jack", 29, "South"), new Employee("Tom", 24, "North"), new Employee("Harry", 35, "West"), ...
Read MoreWhat is variable shadowing in java?
In Java you can declare three types of variables namely, instance variables, static variables and, local variables.Local variables − Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.Instance variables − Instance variables are variables within a class but outside any method. These variables are initialized when the class is instantiated. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.Class (static) variables − Class variables are variables declared within a class, ...
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 write a switch statement in a JSP page?
Following is the example of using a switch statement within a JSP page. SWITCH...CASE Example The above code will generate the following result −It's Wednesday.
Read MoreAbstractSequentialList in Java
The Java Collection Framework contains the AbstractSequentialList class. This class is used to create and implement an unmodifiable list. Also this class implements the Collection interface and the AbstractCollection class.A program that demonstrates this is given as follows −Exampleimport java.util.*; public class Demo { public static void main(String[] args) { AbstractSequentialList list = new LinkedList(); list.add("John"); list.add("Martha"); list.add("Sally"); list.add("Susan"); list.add("Harry"); System.out.println("The elements are: " + list); } }The output of the above program is as follows −OutputThe ...
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