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Java Articles
Page 49 of 450
How to write an if-else statement in a JSP page?
The if...else block starts out as an ordinary Scriptlet, but the Scriptlet is closed at each line with HTML text included between the Scriptlet tags.Example IF...ELSE Example Today is weekend Today is not weekend The above code will generate the following result −Today is not weekend
Read MoreHow to delete cookies with JSP?
To delete cookies is very simple. If you want to delete a cookie, then you simply need to follow these three steps −Read an already existing cookie and store it in Cookie object.Set cookie age as zero using the setMaxAge() method to delete an existing cookie.Add this cookie back into the response header.Following example will show you how to delete an existing cookie named "first_name" and when you run main.jsp JSP next time, it will return null value for first_name.Example Reading Cookies Reading ...
Read MoreWhere will be the uploaded files stored in JSP?
A JSP can be used with an HTML form tag to allow users to upload files to the server. An uploaded file can be a text file or a binary or an image file or just any document.Creating a File Upload FormLet us now understand how to create a file upload form. The following HTML code creates an uploader form. Following are the important points to be noted down −The form method attribute should be set to POST method and the GET method cannot be used.The form enctype attribute should be set to multipart/form-data.The form action attribute should be set ...
Read MoreHow to print date and time in specific format using JSP?
SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. SimpleDateFormat allows you to start by choosing any user-defined patterns for date-time formatting.Let us modify the above example as follows −Example Display Current Date & Time Display Current Date & Time Compile the above servlet once again and then call this servlet using the URL http://localhost:8080/CurrentDate. You will receive the following result −OutputDisplay Current Date & Time Mon 2010.06.21 at 10:06:44 PM GMT+04:00
Read MoreDuration ZERO field in Java
The ZERO field sets the duration to zero in the Duration class in Java. This field is quite the same as the null value in different data types in Java.A program that demonstrates the ZERO field is given as follows −Exampleimport java.time.Duration; public class Demo { public static void main(String[] args) { Duration d = Duration.ZERO; boolean flag = d.isZero(); System.out.println("The duration is: " + d); if(flag) System.out.println("The above duration is of zero length"); else System.out.println("The ...
Read MoreInstant isSupported() method in Java
It can be checked if a ChronoUnit is supported by the Instant class or not by using the isSupported() method in the Instant class in Java. This method requires a single parameter i.e. the ChronoUnit to check. It returns true if the ChronoUnit is supported by the Instant class and false otherwise.A program that demonstrates this is given as follows −Exampleimport java.time.*; import java.time.temporal.ChronoUnit; public class Demo { public static void main(String[] args) { Instant i = Instant.now(); System.out.println("The current instant is: " + i); boolean flag = i.isSupported(ChronoUnit.SECONDS); ...
Read MoreInstant range() method in Java
The range of values for a field can be obtained using the range() method in the Instant class in Java. This method requires a single parameter i.e. the ChronoField for which the range of values are required and it returns the range of valid values for the ChronoField.A program that demonstrates this is given as follows −Exampleimport java.time.*; import java.time.temporal.ChronoField; import java.time.temporal.ValueRange; public class Demo { public static void main(String[] args) { Instant i = Instant.now(); ValueRange range1 = i.range(ChronoField.MILLI_OF_SECOND); ...
Read MoreInstant get() method in Java
The value of the required ChronoField for an Instant can be obtained using the get() method in the Instant class in Java. This method requires a single parameter i.e. the ChronoField and it returns the value of the ChronoField that was passed as a parameter.A program that demonstrates this is given as follows −Exampleimport java.time.*; import java.time.temporal.ChronoField; import java.time.temporal.ValueRange; public class Demo { public static void main(String[] args) { Instant i = Instant.now(); int micro = i.get(ChronoField.MICRO_OF_SECOND); System.out.println("The current Instant is: " + i); System.out.println("The MICRO_OF_SECOND Field ...
Read MoreIntStream peek() method in Java
The peek() method in the IntStream class in Java returns a stream consisting of the elements of this stream. It additionally performs the provided action on each element as elements are consumed from the resulting stream.The syntax is as followsIntStream peek(IntConsumer action)Here, the parameter action is a non-interfering action to perform on the elements as they are consumed from the stream. The IntConsumer represents an operation that accepts a single int-valued argument and returns no result.The following is an example to implement IntStream peek() method in JavaExampleimport java.util.*; import java.util.stream.IntStream; public class Demo { public static void ...
Read MoreThe contains() method of AbstractSequentialList in Java
The contains() method of AbstractSequentialList in Java is used to check whether an element is in the Collection.The syntax is as followspublic boolean contains(Object ob)Here, ob is the element to be checked. To work with the AbstractSequentialList class in Java, you need to import the following packageimport java.util.AbstractSequentialList;The following is an example to implement AbstractSequentialList contains() method in JavaExampleimport java.util.LinkedList; import java.util.AbstractSequentialList; public class Demo { public static void main(String[] args) { AbstractSequentialList absSequential = new LinkedList(); absSequential.add(250); absSequential.add(320); ...
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