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Programming Articles
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How to generate Infinite Stream of Double in Java using DoubleStream.generate()
The DoubleStream.generate() method returns an infinite sequential unordered stream where each element is generated by the provided DoubleSupplier.The syntax is as follows −static DoubleStream generate(DoubleSupplier s)Here, s is the DoubleSupplier for generated elements. The DoubleSupplier represents a supplier of double-valued results.To use the DoubleStream class in Java, import the following package −import java.util.stream.DoubleStream;The following is an example to generate Infinite stream of Double in Java with DoubleStream.generate() method −Exampleimport java.util.stream.*; import java.util.*; public class Demo { public static void main(String[] args) { Random r = new Random(); DoubleStream.generate(r::nextDouble).forEach(System.out::println); } }Here is ...
Read MoreHow to send an error code using JSP to browser?
Following example shows how a 407 error code is sent to the client browser. After this, the browser would show you "Need authentication!!!" message. Setting HTTP Status Code You will receive the following output −HTTP Status 407 - Need authentication!!! type Status report message Need authentication!!! description The client must first authenticate itself with the proxy (Need authentication!!!). Apache Tomcat/5.5.29
Read MoreIs there any JSTL library to parse XML in a JSP?
The JSTL XML tags provide a JSP-centric way of creating and manipulating the XML documents. Following is the syntax to include the JSTL XML library in your JSP.The JSTL XML tag library has custom tags for interacting with the XML data. This includes parsing the XML, transforming the XML data, and the flow control based on the XPath expressions.Before you proceed with the examples, you will need to copy the following two XML and XPath related libraries into your \lib −XercesImpl.jar − Download it from https://www.apache.org/dist/xerces/j/xalan.jar − Download it from https://xml.apache.org/xalan-j/index.html
Read MoreWhat is extends attribute in JSP?
The extends attribute specifies a superclass that the generated servlet must extend.For example, the following directive directs the JSP translator to generate the servlet such that the servlet extends somePackage.SomeClass −
Read MoreWhat is import attribute in JSP?
The import attribute serves the same function as and behaves like, the Java import statement. The value for the import option is the name of the package you want to import.To import java.sql.*, use the following page directive −To import multiple packages, you can specify them separated by comma as follows −By default, a container automatically imports java.lang.*, javax.servlet.*, javax.servlet.jsp.*, and javax.servlet.http.*.
Read MoreJava Program to convert this duration to the total length in nanoseconds
With this, get the nanoseconds in days, hours and minutes. At first, set the Duration:Duration d1 = Duration.ofDays(5); Duration d2 = Duration.ofHours(20); Duration d3 = Duration.ofMinutes(15);Convert the above Duration to nanoseconds:System.out.println("Nanoseconds in 5 days = "+d1.toNanos()); System.out.println("Nanoseconds in 20 hours = "+d2.toNanos()); System.out.println("Nanoseconds in 15 minutes = "+d3.toNanos());Exampleimport java.time.Duration; public class Demo { public static void main(String[] args) { Duration d1 = Duration.ofDays(5); Duration d2 = Duration.ofHours(20); Duration d3 = Duration.ofMinutes(15); System.out.println("Nanoseconds in 5 days = "+d1.toNanos()); System.out.println("Nanoseconds in 20 hours = "+d2.toNanos()); ...
Read MoreWhat is info attribute in JSP?
The info attribute lets you provide a description of the JSP. The following is a coding example −
Read MoreJava Program to create Instant from Epoch second and millisecond
Create Instant from Epoch SecondExampleimport java.time.Instant; public class Demo { public static void main(String[] args) { Instant instant = Instant.ofEpochSecond(282829279); System.out.println(instant); } }Output1978-12-18T11:41:19ZCreate Instant from Epoch MillisecondsExampleimport java.time.Instant; public class Demo { public static void main(String[] args) { Instant instant = Instant.ofEpochMilli(272827282728l); System.out.println(instant); } }Output1978-08-24T17:21:22.728Z
Read MoreWhat is isThreadSafe attribute in JSP?
The isThreadSafe option marks a page as being thread-safe. By default, all JSPs are considered thread-safe. If you set the isThreadSafe option to false, the JSP engine makes sure that only one thread at a time is executing your JSP.The following page directive sets the isThreadSafe option to false −
Read MoreHow to process SQL statements with JDBC explain with an example?
To process an SQL statement, you need to follow the steps given below:Establish the connection.Create a statement.Execute the statement/query.Process the result.Close the connection.Establishing a ConnectionTo process SQL statements first of all you need to establish connection with the desired DBMS or, file System or, other data sources.To do so, Register the JDBC driver class, corresponding to the DataSource you need to the DriverManager using the registerDriver() method.Driver myDriver = new com.mysql.jdbc.Driver(); DriverManager.registerDriver(myDriver);This method accepts an object of the Driver class; it registers the specified Driver with the DriverManager.You can also register the driver using the forName() method. This method loads ...
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