Java Articles - Page 151 of 745

StackWalker API has been introduced in Java 9, and it gives a snapshot of the stack trace of current thread at any given point of time and has methods to walk over it. The advantage of using StackWalker class over Thread::getStackTrace() is to filter or skip certain classes and get the instance of declaring the class itself and get either short stack trace or full stack trace instead of pulling the complete stack trace itself.In the below example, we can use java.util.stream.Stream.skip() method to skip Stack Frames.Exampleimport java.lang.StackWalker.*; import java.util.Optional; import java.util.List; import java.util.stream.Collectors; import java.lang.StackWalker.StackFrame; public class StackWalkerSkipTest {    public ... Read More

JShell is based on the REPL (Read-Evaluate-Print-Loop) introduced in Java 9. This tool can be used to execute simple statements, evaluate it, and prints the result.A switch statement can test multiple conditions just like an else clause and handles the default possibility. The default clause can be executed when none of the cases match, and a break statement can be used to break out of switch after a successful match.In the below code snippet, we can define the switch statement in JShell.Snippet-1jshell> int i = 10; i ==> 10 jshell> switch(i) { ...> case 1 ... Read More

JShell is an interactive tool that takes simple statements, expressions and etc.. as input, evaluates it, and prints the result immediately to the user.Terminal Operation is a stream operation that takes a stream as input and doesn't return any output stream. For instance, a terminal operation can be applied to a lambda expression and returns a single result (A single primitive-value/object, or a single collection-of-objects). The reduce(), max(), and min() methods are a couple of such terminal operations.In the below code snippet, we can use different terminal operations: min(), max(), and reduce() methods in JShell.Snippetjshell> IntStream.range(1, 11).reduce(0, (n1, n2) -> n1 + n2); $1 ... Read More

Java 9 has added StackWalker class to provide a standard API for accessing the current thread stack. In the previous java versions, we can use Throwable::getStackTrace, Thread::getStackTrace, and SecurityManager:: GetClassContext provided methods to obtain the thread stack.Thread.getStackTrace() method will return an array of stack trace elements representing the stack dump of a thread (StackTraceElement[]). The first element of an array represents the top of a stack, it can be the last method invocation in a sequence, and the last element of an array represents the bottom of a stack, it can be the first method invocation in a sequence.Syntaxpublic StackTraceElement[] ... Read More

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 of the input ... Read More

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 ==> 2020-04-22 jshell> today.getYear() $3 ==> ... Read More

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

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 "! : NOT".In the below two code snippets, we can ... Read More

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() method must place an upper ... Read More

Any element that can be annotated with @Deprecated signifies that this particular element no longer be used for below reasonsUsing it is risky and may cause errors.May be incompatible in future versions.May be removed in future versions.A better and more efficient solution has replaced it.Java 9 has added two new elements: since and forRemoval attributes.1) since: The element specifies the deprecated version of the annotated API element.2) forRemoval: The element representing the annotated API element can be removed in a future version, and the API can be migrated.The following webpage is the documentation for a Boolean class in Java 9. The @Deprecated annotation ... Read More