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Programming Articles
Page 2503 of 2547
What is language attribute in JSP?
The language attribute indicates the programming language used in scripting the JSP page.For example, because you usually use Java as the scripting language, your language option looks like this −
Read MoreWhat is session attribute in JSP?
The session attribute indicates whether or not the JSP page uses HTTP sessions. A value of true means that the JSP page has access to a builtin session object and a value of false means that the JSP page cannot access the builtin session object.Following directive allows the JSP page to use any of the builtin object session methods such as session.getCreationTime() or session.getLastAccessTime() −
Read MoreWhat is RowId object in JDBC Explain?
A RowId is a built-in type of SQL which is an address of a row in a table of a database. The RowId interface of the java.sql package maps with the SQL ROWID value.RowId values are unique for every row and they are the fastest way to access a row. You cannot use this as a primary key of a table.Retrieving RowId objectsYou can retrieve the RowId of a particular row using the getRowId() method of the ResultSet, CallableStatement, PreparedStatement interfaces.This method accepts a String value representing a column label or, an integer value representing the column index and returns ...
Read MoreWhat is isELIgnored Attribute in JSP?
The isELIgnored attribute gives you the ability to disable the evaluation of Expression Language (EL) expressions which has been introduced in JSP 2.0.The default value of the attribute is true, meaning that expressions, ${...}, are evaluated as dictated by the JSP specification. If the attribute is set to false, then expressions are not evaluated but rather treated as static text.Following directive sets an expression not to be evaluated −
Read MoreCan we test XPath expression in JSP?
The tag evaluates a test XPath expression and if it is true, it processes its body. If the test condition is false, the body is ignored.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultselectThe XPath expression to be evaluatedYesNonevarName of the variable to store the condition's resultNoNonescopeScope of the variable specified in the var attributeNoPageExampleFollowing is an example that show the use of the tag − JSTL x:if Tags Books Info: ...
Read MoreHow to create LabelValue Tuple in Java?
You can create a LabelValue tuple using the with() method or using just the constructor. Let us first see what we need to work with JavaTuples. To work with LabelValue class in JavaTuples, you need to import the following packageimport org.javatuples.LabelValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuplesSteps: How to run JavaTuples program in EclipseThe following is an example to create ...
Read MoreHow to get the seconds and minutes between two Instant timestamps in Java
The following are the two Instant timestamps:Instant one = Instant.ofEpochSecond(1355836728); Instant two = Instant.ofEpochSecond(1355866935);Get the Duration between both the Instant:Duration res = Duration.between(one, two);Now, get the seconds between the two timestamps:long seconds = res.getSeconds();Now, get the minutes between the two timestamps:long minutes = res.abs().toMinutes();Exampleimport java.time.Duration; import java.time.Instant; public class Demo { public static void main(String[] args) { Instant one = Instant.ofEpochSecond(1355836728); Instant two = Instant.ofEpochSecond(1355866935); Duration res = Duration.between(one, two); System.out.println(res); long seconds = res.getSeconds(); System.out.println("Seconds between Durations = "+seconds); ...
Read MoreWhat is isScriptingEnabled Attribute in JSP?
The isScriptingEnabled attribute determines if the scripting elements are allowed for use.The default value (true) enables scriptlets, expressions, and declarations. If the attribute's value is set to false, a translation-time error will be raised if the JSP uses any scriptlets, expressions (non-EL), or declarations.The attribute's value can be set to false if you want to restrict the usage of scriptlets, expressions (non-EL), or declarations −
Read MoreJava Program to minus seconds and nanoseconds from Instant
Let us first set an Instant:Instant now = Instant.ofEpochMilli(184142540078l);Let us now minus seconds from Instant:Instant resSeconds = now.minusSeconds(50);Let us now minus nanoseconds from Instant:Instant resNanoSeconds = now.minusNanos(10000);Exampleimport java.time.Instant; public class Demo { public static void main(String[] args) { Instant now = Instant.ofEpochMilli(184142540078l); System.out.println(now); Instant resSeconds = now.minusSeconds(50); System.out.println("After subtracting seconds = "+resSeconds); Instant resNanoSeconds = now.minusNanos(10000); System.out.println("After subtracting nanoseconds = "+resNanoSeconds); } }Output1975-11-02T06:42:20.078Z After subtracting seconds = 1975-11-02T06:41:30.078Z After subtracting nanoseconds = 1975-11-02T06:42:20.077990Z
Read MoreFetch the value from an Octet Tuple in Java
To fetch the value from an Octet Tuple, use the getValueX() method. Here X is the index for which you want the value.For example, to fetch the 5th element i.e. 4th index, use the getValueX() method as −getValue(4);Let us first see what we need to work with JavaTuples. To work with Octet class in JavaTuples, you need to import the following package −import org.javatuples.Octet;Note − Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project -> Properties -> Java Build Path -> Add External Jars and upload the downloaded JavaTuples jar file. ...
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