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The join() Method In Java, a join() is a final method of the Thread class, and it can be used to join the start of a thread's execution to the end of another thread's execution so that a thread will not start running until another thread has ended. If the join() method is called on a thread instance, the currently running thread will be blocked until the thread instance has finished its execution. The join() method in Java is important in multithreading because it allows one thread to wait for the completion of another thread before continuing execution. Syntax Following is ... Read More
The ArrayList class in Java is a Resizable-array implementation of the List interface. It allows null values. Java clear() Method V/S removeAll() Method There are some important differences between the clear() and removeAll (Collection c) methods of the ArrayList class. This table compares these two methods. Key clear() removeAll() ... Read More
No, HashMap does not allow duplicate keys. The HashMap is a class that implements the Map interface. It is based on the Hash table. It is used to store key-value pairs. It allows null keys and values, but it does not allow duplicate keys. You can store key-value pairs in the HashMap object. Once you do so, you can retrieve the values of the respective keys, but the values we use for keys should be unique. Let's understand what will happen if we try to add a duplicate key into a HashMap.Addng a duplicate key to a HashMapThe put() method ... Read More
The substrings are the sequence of characters that appear within the string. While working with multiple strings, it is useful to find the longest common substring. There are various ways to find the longest common substring from more than two strings. one of the most common approach is using the dynamic programming. Let's dive into the article to learn more about this task. Using Dynamic Programming In this approach, we are going to use the dynamic programming (DP), Here we compare the strings pairwise (starting with first two strings), we find their longest common substring using a DP ... Read More
The Console class is part of the Java.io package and is used to read input from the keyboard or user and write output to the console. Unlike Scanner, the Console class provides methods to read text and passwords. If you read a password using the Console class, it will not be displayed to the user (without showing the typed characters). To use the Console class, we need its object, and the Console object is obtained by calling System.console() as shown below - Console console = System.console(); Note: If you try to execute the program in a non-interactive environment like an IDE, it doesn’t work. It ... Read More
In C++, both dot (.) and arrow (->) operators are used to access members of classes, structures, and unions. But they are used in different scenarios based on how the object is being accessed. In this article, we will learn the differences and uses of these two operators in C++. Dot Operator (.) The dot(.) operator is used to access members (variables and functions) of a class, structure, or union when working with its object (not a pointer). It allows you to access and manipulate the object's properties by directly interacting with members of an object. Syntax Here is the ... Read More
The shell sorting technique is based on the insertion sort. In the insertion sort, sometimes we need to shift a large block to insert an item in the correct position. In shell sort, we avoid large number of shifting. The sorting is done with specific interval. After each pass, the interval is reduced to make smaller interval. We call also say we use gapped insertion sort in shell sort as we compare elements separated by a gap. In this article, we have an unsorted array. Our task is to sort the given unsorted array by implementing the shell sort in ... Read More
The Segmented Sieve algorithm is used to find the prime numbers within a given range. Segmented Sieve first uses the Sieve of Eratosthenes algorithm to find the primes smaller than or equal to √(n). The idea of this algorithm is to divide the range [0 ... n-1] in different segments and compute primes in all segments one by one. In this article, we have a range defined from low to high. Our task is to implement the Segmented Sieve to find the prime numbers within the given range in C++. Example The following example generates all the prime numbers between ... Read More
In this article, we will learn to set a tooltip text for each item of a JList in Java. Tooltips give meaningful information as users hover over UI components. Swing's JList does not support tooltips on a per-item basis, so it will involve some customization. What is JList? A JList is a subclass of the JComponent class, and it can be used to display a list of objects that allows the user to select one or more items. A JList can generate a ListSelectionListener interface and needs to implement the abstract method valueChanged(). Syntax The following is the syntax for ... Read More
In this article, we will learn to write/create a JSON file using Java. JSON has become the standard for data exchange for any kind of application. Java also has a collection of libraries helpful in creating and storing JSON files. JSON JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange. Conventions used by JSON are known to programmers, which include C, C++, Java, Python, Perl, etc. Sample JSON document Below is an example of a JSON file: { "book": [ { ... Read More