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Programming Articles
Page 2499 of 2547
What is a pageContext Object in JSP?
The pageContext object is an instance of a javax.servlet.jsp.PageContext object. The pageContext object is used to represent the entire JSP page.This object is intended as a means to access information about the page while avoiding most of the implementation details.This object stores references to the request and response objects for each request. The application, config, session, and out objects are derived by accessing attributes of this object.The pageContext object also contains information about the directives issued to the JSP page, including the buffering information, the errorPageURL, and page scope.The PageContext class defines several fields, including PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, and APPLICATION_SCOPE, ...
Read MoreHow to find the current row of a ResultSet object using JDBC?
The getRow() method of the ResultSet class returns the row number at which the ResultSet pointer exists in the current instance.Assume we have a table named cricketers_data with 6 records as shown below:+------------+------------+---------------+----------------+-------------+ | First_Name | Last_Name | Date_Of_Birth | Place_Of_Birth | Country | +------------+------------+---------------+----------------+-------------+ | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | Lumara | Sangakkara | 1977-10-27 | Matale ...
Read MoreFetch the key from a KeyValue Tuple in Java
To fetch the key from a KeyValue tuple in Java, use the getKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;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 JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to fetch the ...
Read MoreHow to handle Null values while working with JDBC?
SQL's use of NULL values and Java's use of null are different concepts. So, to handle SQL NULL values in Java, there are three tactics you can use:Avoid using getXXX( ) methods that return primitive data types.Use wrapper classes for primitive data types, and use the ResultSet object's wasNull( ) method to test whether the wrapper class variable that received the value returned by the getXXX( ) method should be set to null.Use primitive data types and the ResultSet object's wasNull( ) method to test whether the primitive variable that received the value returned by the getXXX( ) method should ...
Read MoreSet Ennead value in JavaTuples
To set Ennead value in Java, you need to use the setAtX() method. Here, X represents the index wherein you need to set the value i.e. for index 1, use setAt1() method. Set the value as the parameter value of the method.Let us first see what we need to work with JavaTuples. To work with Ennead class in JavaTuples, you need to import the following packageimport org.javatuples.Ennead;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 ...
Read MoreWhat is the use of page object in JSP? Need an example.
JSP gives you an option to specify Error Page for each JSP using page attribute. Whenever the page throws an exception, the JSP container automatically invokes the error page.Following is an example to specifiy an error page for a main.jsp. To set up an error page, use the directive. Error Handling Example We will now write one Error Handling JSP ShowError.jsp, which is given below. Notice that the error-handling page includes the directive . This directive causes ...
Read MoreC++ Program to Implement Bucket Sort
In the Bucket Sorting technique, the data items are distributed of a set of buckets. Each bucket can hold similar type of data. After distributing, each bucket is sorted using another sorting algorithm. After that all elements are gathered into the main list to get the sorted form.The complexity of Bucket Sort TechniqueTime Complexity: O(n + k) for best case and average case and O(n2 ) for worst case.Space Complexity: O(nk) for worst caseInput − A list of unsorted data: 0.25 0.36 0.58 0.41 0.29 0.22 0.45 0.79 0.01 0.69 Output − Array after Sorting: 0.01 0.22 0.25 0.29 0.36 ...
Read MoreIterate through Decade Tuple in Java
To iterate through Decade Tuple, work it like any other collection in Java i.e. using a for loop, iterate and display the elements. Let us first see what we need to work with JavaTuples. To work with Decade class in JavaTuples, you need to import the following packageimport org.javatuples.Decade;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 JavaTuples:Steps: How to run JavaTuples program ...
Read MoreSet key in the JavaTuples KeyValue class
To set key in the JavaTuples KeyValue class, you need to use the setKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;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 JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to set ...
Read MoreWhich library can be used to interact with database in JSP?
The JSTL SQL tag library provides tags for interacting with relational databases (RDBMSs) such as Oracle, MySQL, or Microsoft SQL Server.Following is the syntax to include JSTL SQL library in your JSP −Following table lists out the SQL JSTL Tags −S.No.Tag & Description1Creates a simple DataSource suitable only for prototyping2Executes the SQL query defined in its body or through the sql attribute.3Executes the SQL update defined in its body or through the sql attribute.4Sets a parameter in an SQL statement to the specified value.5Sets a parameter in an SQL statement to the specified java.util.Date value.6Provides nested database action elements with ...
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