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Programming Articles
Page 2356 of 2547
How to use intermediate stream operations in JShell in Java 9?
JShell is a tool introduced in Java 9, and it accepts simple statements like expressions, variables, methods, classes, etc.. as input and produces immediate results.A Stream is a sequence of values. An intermediate stream operation is an operation that takes a stream. For instance, it can be applied to a lambda expression and produces another stream of elements as its result.The most popular intermediate stream operations are mentioned below:1) sorted(): This method preserves the elements of the consumed stream as a result but also puts them in natural sorted order.2) distinct(): This method returns a stream retaining only unique elements ...
Read MoreHow to implement java.time.LocalDate using JShell in Java 9?
JShell is a REPL (Read-Eval-Print-Loop) interactive tool introduced in Java 9 that takes input, evaluates it, and returns output to a user.java.util.LocalDate class provides a number of methods to retrieve Date information: Day/Month/Year and related attributes Date meta-information: Classification-related information such as whether a leap year, etc. LocalDate class is immutable, and we can use different methods provided to add and subtract days, months, and years. Each of these returns a new instance of LocalDate.In the below two code snippets, we can able to print different operations using LocalDate class.Snippet-1jshell> import java.time.*; jshell> LocalDate today = LocalDate.now() today ==> ...
Read MoreWhat are the rules for the Publisher interface in Java 9?
A Publisher is a provider of an unbounded number of sequenced elements publishing them according to demand received from its Subscribers. Publisher interface is responsible for publishing elements of type T and provides a subscribe() method for subscribers to connect to it.public interface Publisher { public void subscribe(Subscriber
Read MoreHow to implement relational and logical operators in JShell in Java 9?
JShell has introduced in Java 9 that enables us to explore, discover, and experiment with Java language features, and extensive libraries.The relational operators (==, != , =) can be used mainly for comparison. It accepts operands of non-boolean primitive data types and returns a boolean value. JShell also supports logical operators that can be used in expressions. The logical operators can expect boolean operands. The expressions involving these operands can be used for forming boolean conditions in the code within if, for, and while statements. The logical operators include : "&& : logical AND", "|| : OR" and "! : ...
Read MoreWhat are the rules for the Subscription interface in Java 9?
A Subscription can be shared by exactly one Publisher and one Subscriber for the purpose of mediating data exchange. That is the reason subscribe() method doesn't return created Subscription, instead returns void. The Subscription is only passed to Subscriber through the onSubscribe() method callback. The Subscription interface contains two methods: request() and cancel().Syntaxpublic interface Subscription { public void request(long n); public void cancel(); }Rules for Subscription interface:Subscription.request() and Subscription.cancel() methods must be called only inside of its Subscriber context.Subscription must allow Subscriber to call the Subscription.request() method synchronously from within onNext() or onSubscribe() methods.Subscription.request() ...
Read MoreHow to declare multiple resources in a try-with-resources statement in Java 9?
Try-with-resources statement has been improved in Java 9. If we already have a resource that is final or equivalent to the final variable, then we can use that variable in a try-with-resources statement without having to declare a new variable in a try-with-resources statement.We can declare multiple resources in a try block. Try initialization block can have any number of resources resulting in either null or non-null resources.In the below example, we can able to declare multiple resources in the try-with-resources statement.Exampleimport java.io.BufferedReader; import java.io.IOException; import java.io.Reader; import java.io.StringReader; public class MultipleResourcesTest { public static void ...
Read MoreHow to implement integer type conversion in JShell in Java 9?
JShell is a command-line interactive tool introduced in Java 9 version that allows the programmer to execute simple statements, expressions, variables, methods, classes, interfaces, etc.. without declaring the main() method.In JShell, the compiler warns the programmer about typecasting issues by throwing errors. However, if the programmer is aware of it, then explicit casting will be required. If we need to store a smaller data value into a larger type conversion, then implicit casting will be required.There are two kinds of integer typecasting:Literal-to-variable assignment: For instance, short s1 = 123456, the data is out of range. It is known at compile-time, ...
Read MoreWhat are the rules for the Subscriber interface in Java 9?
Subscriber interface subscribes to publishers to receive items through onNext() method, error message through the onError() method, or a signal that no more items to be expected through the onComplete() method. Before any of those things happen, the publisher calls onSubscription() method.public interface Subscriber { public void onSubscribe(Subscription s); public void onNext(T t); public void onError(Throwable t); public void onComplete(); }Rules for Subscriber interface:A Subscriber must call through Subscription.request(long n) method to receive onNext() signals.Subscriber.onComplete() and Subscriber.onError(Throwable t) methods must not call any methods on Subscription or Publisher.Subscriber.onComplete() and Subscriber.onError(Throwable t) methods must consider the Subscription canceled after received ...
Read MoreHow to create a process using ProcessBuilder in Java 9?
Java 9 added ProcessHandle interface to Process API to enhance Process class. An instance of the ProcessHandle interface identifies a local process that allows us to query process status and managing processes, and ProcessHandle.Info allows us to use local code because of the need to obtain the PID of a local process.ProcessBuilder class can be used to create separate operating system processes. In the below example, we can create a process of "notepad" application by using the ProcessBuilder class.Exampleimport java.time.ZoneId; import java.util.stream.Stream; import java.util.stream.Collectors; import java.io.IOException; public class ProcessBuilderTest { public static void main(String args[]) throws IOException { ProcessBuilder pb = new ProcessBuilder("notepad.exe"); ...
Read MoreWrite a program to calculate pow(x,n) in C++
In this problem, we are given two integers x and n. Our task is to write a program to calculate the pow(x,n). Let's take an example to understand the problem, Input: x = 5 , n = 3 Output: 125 Example Program to calculate the pow(x,n): #include using namespace std; float myPow(float x, int y) { if (y == 0) return 1; float temp = myPow(x, y / 2); if (y % 2 == 0) return temp * temp; else { if (y > 0) return x * temp * temp; else return (temp * temp) / x; } } int main() { float x = 5; int n = 7; cout
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