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Programming Articles
Page 1668 of 2547
C++ Program to Find kth Largest Element in a Sequence
In this article, we have an unsorted array. Our task is to find the kth maximum element of that array using C++. Here is an example to understand the meaning of k. If k =2, you can say the second highest value, for k =3, the third highest value. The approaches that we will be using are mentioned below: Using Sorting Using Max Heap Using Min Heap Using Quick Select Using Binary Search Tree Using ...
Read MoreWhat is a ClassCastException and when it will be thrown in Java?
In this article, we will be learning about ClassCastException in Java. But before we jump into this, we'll understand what an exception is in Java. After that, we'll learn why and when ClassCastException occurs, look at real-world code examples that throw this exception, and finally learn how to avoid or resolve it. What is an Exception in Java? An exception in Java is an event that disrupts the normal flow of the program. Java provides a way to handle these errors gracefully using try-catch blocks. There are 2 types of exceptions: Checked Exceptions – ...
Read MoreHow to display the different font items inside a JComboBox in Java?
In this article, we will learn to display the different font items inside a JComboBox in Java. The Swing framework provides a powerful JComboBox component that allows users to select an object from a drop-down list. What is a JComboBox? A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate an ActionListener, ChangeListener, and ItemListener interfaces when the user interacts with a combo box. Syntax The following is the syntax: JComboBox Box_Name = new JComboBox(array); Problem ...
Read MoreCase-insensitive string comparison in C++
To compare two strings in C++, we can use various inbuilt functions and approaches that are already discussed in the previous sections. However, there are some cases where we need to compare two strings case-insensitively, meaning that we need to ignore the case of the characters in the strings while comparing them. In this article, we will focus on learning how to compare two strings case-insensitively in C++. Here is a list of approaches for case-insensitively string comparison, which we will be discussing in this article with stepwise explanation and complete example codes. ...
Read MoreDifference between Iterator and Enumeration in Java
Iterator and Enumeration are both cursors to traverse and access elements from the collection. They both belong to the collection framework. Enumeration was added in JDK1.0 and Iterator in JDK 1.2 version in the collection framework. Java Enumeration Enumeration: An enumeration is a special "class" that indicates a collection of constants. Enumeration can’t make structural changes in the collection because it has read-only access to its elements. It has the following methods − hasMoreElements(): The hasMoreElements() method checks to see if more elements exist in the underlying collection class nextElement(): The ...
Read MorenDifference between Save and SaveAndFlush in Spring Java
Save and SaveAndFlush both can be used for saving entities. They both are both belong to the Spring data library. Save may or may not write your changes to the DB straight away. When we call saveAndFlush system is enforcing the synchronization of your model state with the DB. What is the save method? The save method is used to store an entity in the database. It adds the entity to the transactional buffer, and when the transaction is committed, the data is saved. It then returns the stored entity. Example The following is an example of the save method ...
Read MoreDifference between fail-fast and fail safe in Java
In this article, we will find the differences between Fail-Fast and Fail-Safe Iterators. They both describe how collections behave when they are modified during iteration. What is an iterator? An Iterator is an object in Java used to cycle through a collection, accessing or removing elements. It can be obtained by using the iterator() method of a collection. What is FailSafe? Fail-safe also called a Non-Fail-fast Iterator, does not throw ConcurrentModificationException. It works on a copy of the collection. Any changes made in the iterator only affect the copy but not the original collection. Example The following is an ...
Read MoreDifference between volatile and transient in java
In this article, we will find the differences between volatile and Transient. Both have a different purpose for specifying before a variable. These modifiers are important in determining the behavior and characteristics of variables in different cases. What is volatile? A volatile keyword is used in a multithreading environment where two threads reading and writing the same variable simultaneously. The volatile keyword flushes the changes directly to the main memory instead of the CPU cache. Example of Volatile The following is an example of Volatile in Java: public class VolatileExmaple extends Thread { volatile boolean isRunning ...
Read MoreDifference Between CrudRepository and JPARepository in Java
CrudRepository and JPA repository both are the interface of the spring data repository library. Spring data repository reduces the boilerplate code by providing some predefined finders to access the data layer for various persistence layers. What is JPA repository? JPA is a repository interface that extends CrudRepository and PagingAndSorting repository. It inherits some finders from crud repository such as findOne, gets and removes an entity. It also provides some extra methods related to JPA such as delete records in batch, flushing data directly to a database base and methods related to pagination and sorting. We need to extend this repository ...
Read MoreCheck if a string contains a sub-string in C++
A substring is a continues sequence of characters within a larger string. For example, the string "point" a substring of the string "TutorialsPoint". In this article, we will learn different approaches to check if a string contains a substring in C++. Here is a list of approaches for checking if a string contains a substring, which we will be discussing in this article with stepwise explanation and complete example codes. Using find() Using search() Using regex_search() Manual Substring ...
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