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Java program to find sum of digits of a number using recursion
In this article, we will understand how to find the sum of the digits of a number using recursion in Java. A recursive function is a function that calls itself multiple times until a particular condition or base condition is met. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function. Problem Statement Write a program in Java to find the sum of the digits of a number using recursion. Below is a demonstration of the same. Input Enter the number : 12131415 ...
Read MoreJava program to calculate the power using recursion
To calculate the power of a number, Java provides different ways to do this using loops, built-in methods, and recursion. In this article, we will learn how to calculate the power of a number using recursion. In Java, Recursion is a process in which a function calls itself multiple times until it reaches a base condition, and the corresponding function is called a recursive function. Problem Statement Given a base number and a power value, we need to calculate the result of raising the base to the power using recursion. Below is a demonstration of the same. Input: Enter ...
Read MoreHow do I insert elements at a specific index in Java list?
In this article, we will learn how to insert an element at a specific index in a Java list. For example, we have a fruit list by certain order and we want to insert a new fruit at a specific index in the list. Following are the ways to insert an element at a specific index in a Java list: Using add() Method Using ListIterator Using Stream API Using add() Method The add() method of the the list interface helps us to insert an element at ...
Read MoreJava Program to Display Prime Numbers Between Two Intervals
In this article, we will understand how to find prime numbers between two intervals. Prime numbers are special numbers that have only two factors, 1 and itself, and cannot be divided by any other number. 11 is a prime number. Its factors are 1 and 11 itself. Some examples of prime numbers are 2, 3, 5, 7, 11, 13, and so on. 2 is the only even prime number. All other prime numbers are odd numbers. Problem Statement Write a program in Java to display all prime numbers between two given intervals. Below is a demonstration of the same. ...
Read MoreHow to get the date and time in JShell in Java 9?
In this article, we will learn to get the date and time in JShell in Java 9. First, we will learn about the date and time class in Java with an example, and after that will learn about date and time in JShell with multiple examples. JShell JShell is an interactive command-line tool that allows us to learn, investigate, and explore the Java language and its API. We can type any valid Java code into the console and get immediate results without the need to write a verbose class with the main() method. C:\Users\User>jshell | Welcome to JShell -- Version ...
Read MoreHow do I define string constants in C++?
In C++, a string constant also called a string literal is a fixed sequence of characters enclosed in double quotes (" "). For example: "This is a string" and it is used to read-only memory, and its value cannot be changed during the program. Defining C++ Strings ConstantsYou can define your own named string constants by using: String Literals The const keyword The #define preprocessor directive The constexpr keyword(in modern C++) Let us understand each type of String Constant in C++ by ...
Read MoreHow to use the collect() method in Stream API in Java 9?
In this article, we will learn to use the collect() method in the Stream API in Java 9. Java Stream API collect() Method In Java, the collect() method in the Stream API collects all objects from a stream object and stores them in a type of collection. The user has to provide what type of collection the results can be stored. We specify the collection type using the Collectors Enum. There are different types, and different operations can be present in the Collectors Enum. Syntax The following is the syntax for the collect() method declaration: R collect(Collector
Read MoreDifference between EnumMap and HashMap in Java
In this article, we will learn about the EnumMap and HashMap in Java. First, we will know about EnumMap, the syntax of EnumMap, and an example after that will learn about HashMap, the syntax of HashMap, and an example. At the end, we will see a table showing the difference between EnumMap and HashMap. What is EnumMap? EnumMap is introduced in JDK 5. It is designed to use an Enum as a key in the Map. It is an implementation of the Map interface. All of the keys in the EnumMap should be of the same enum type. Keys cannot be ...
Read MoreWhat is Unified JVM Logging in Java 9?
In this article, we will learn about the unified JVM logging in Java 9. Logging in the JVM is a great tool for performing root cause analysis, and it is a part of the JDK(Java Development Kit). Starting from JDK 9, the JVM maintainers chose to rebuild the way the JVM logs things. What is Unified JVM Logging? Java 9 can provide a common logging system for JVM components with a detailed level. By using a new command-line option: -Xlog for all logging settings, and unified JVM logging, gives us an easy-to-configure tool to do a root cause analysis (RCA) ...
Read MoreHow to access each stack element of StackWalker in Java 9?
In this article, we will learn to access each stack element of StackWalker in Java 9. We will learn about the StackWalker API and its methods, and use of getStackTrace() method for accessing each stack element. StackWalker API StackWalker API allows easy filtering and lazy access to execute tasks within any method. It is an efficient API for obtaining stack trace information in Java 9. StackWalker API is an alternative to Thread.getStackTrace() or Throwable.getStackTrace() and SecurityManager.getClassContext(). This API targets a mechanism to traverse and materialize required stack frames, allowing efficient lazy access to additional stack frames when required. The following ...
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