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Articles on Trending Technologies
Technical articles with clear explanations and examples
Applying Python programming to solve Mechanical Engineering Problems
Using Python Programming to solve PDV work problems In cases of closed systems which are also called as systems where the identity of mass does not change, the system interacts with its surroundings either in terms of heat or work. In this article, we will be dealing with the non-dissipative work interaction which is also known as the PDV or displacement work. We will be using Python programming to solve these problems. But before we start, one should know the fundamental meaning of displacement work. The displacement work is evaluated as the integral of the path the system has taken ...
Read MoreHow can I force PHP to use strings for array keys?
To force PHP to use strings for array keys is quite easy, as in PHP array keys are automatically stored as integers if the array elements are numbers. If they are not numbers then it will cast to strings. Forcing PHP to Use strings for Array Keys Following are the ways to force PHP to use strings for array Keys Using php array() function Using json_encode() function Using php array() Function If you use the array() function and keep the first key in quotes it will take other keys as a string does not matter if you are ...
Read MoreJava Program to Get the First Element from LinkedHashSet
LinkedHashSet is a class provided by Java that implements Set Interface. The first element of a LinkedhashSet is nothing but the first element in the collection. In this article, we will discuss different approaches to get the first element from LinkedHashset. What is a LinkedHashSet? A LinkedHashSet is a collection which is a combination of HashSet collection and a LinkedList collection. A HashSet is an unordered collection which doesn't allow duplicates. But, a LinkedList is an ordered collection which stores duplicates Coming to LinkedHashSet as it is a combination of both HashSet and LinkedList it stores the elements in ...
Read MoreJava Program to Recursively Remove All Adjacent Duplicates
The problem statement states that we have given a String str of length N (where N is an integer) containing alphanumeric characters. We need to recursively remove all adjacent duplicate characters so that the resultant string does not contain any adjacent duplicate characters. We can use a recursive or iterative approach to solve the problem. Here, we first remove the adjacent duplicate elements from the left part of the string. After that, we recursively remove the adjacent duplicates from the right part of the string. Example Scenario 1: Input: str1 = "tuttor"; Output: res = tuor The adjacent duplicate ...
Read MoreJava Program to add year to current date using Calendar.add method
The Calendar class of java.util package provides a method with the name add(). This method accepts current date and amount of time as parameter values. If the given amount of time is positive, it will add it to the current date, and in the case of negative time, it will subtract it. In this article, we will see a few Java programs to add year to the current date using the Calendar.add() method. Example Scenario: Input 1: current_date = Thu Nov 22 18:19:06 UTC 2018 Input 2: year_to_add = 12 Output: new_date = Thu Nov 22 18:19:06 UTC 2030 ...
Read MoreJava Program to Find All Palindromic Sub-Strings of a String
In this problem, we are given a String and our task is to find all palindromic sub-strings of the specified length. There are two ways to solve the problem. The first way is to compare the characters of sub-string from start to last, and another way is to reverse the sub-string and compare it with the original sub-string to check whether it is palindrome. String in Java is a class which represents a sequence of characters. It is immutable which means once it is created a String object cannot be changed. And, sub-string is a small portion or part of ...
Read MoreJava Program to Clear the StringBuffer
On clearing the StringBuffer object, all the characters from the buffer will be removed. In this article, we will write Java program to clear the StringBuffer. StringBuffer is a peer class of String that provides much of the functionality of strings. But, String represents fixed-length, immutable character sequences while StringBuffer represents mutable character sequences. Example Scenario: Input: obj = Java Program Output: res = The result will be an empty StringBuffer object. Using delete() method The StringBuffer class of java.lang package provides a method named delete() to clear the StringBuffer. This method accepts start and end indices ...
Read MoreJava Program to Display Numbers and Sum of First N Natural Numbers
Natural numbers are all positive integers or whole numbers that range between 1 to infinity. In this article, we will see how to find the sum of the first N natural numbers in Java, where N is the integer up to which we need to add all the numbers starting from 1. Example Scenario: Input: num = 5 Output: sum = 15 sum = 1 + 2 + 3 + 4 + 5 Using a for loop In this approach, initialize a variable with 0 to store the sum. Then, run a for loop that goes from ...
Read MoreJava program to find common elements in three sorted arrays
The common elements in three sorted arrays are those elements that occur in all three of them. In this article, we will learn how to find common elements from three sorted arrays in Java. An example of this is given as follows − Example Scenario: Input 1: arr1 = [1, 3, 5, 7, 9] Input 2: arr2 = [2, 3, 6, 7, 9] Input 3: arr3 = [1, 2, 3, 4, 5, 6, 7, 8, 9] Output: Common elements = 3 7 9 Here, arrays are data structure which stores a fixed-size sequential collection of elements of the same ...
Read MoreJava program to multiply given floating point numbers
Suppose two floating point numbers are given as operands and your task is to write a Java program to multiply the given numbers. To perform this operation, initialize two float values, multiply and store the result in another float type variable. Float is a datatype in Java which stores numbers with fractional part. Example Scenario: Input 1: num1 = 1.2 Input 2: num2 = 1.4 Output: product = 1.68 Using Multiplication Operator The multiplication operator is represented by asterisk sign (*). It is categorized under arithmetic operator in Java. It can be used to multiply float values ...
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