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Programming Articles
Page 2495 of 2547
I need to understand how to use a bean and update its properties in JSP page. Please share an example.
The useBean action is quite versatile. It first searches for an existing object utilizing the id and scope variables. If an object is not found, it then tries to create the specified object.The simplest way to load a bean is as follows −Once a bean class is loaded, you can use jsp:setProperty and jsp:getProperty actions to modify and retrieve the bean properties.Following table lists out the attributes associated with the useBean action −S.No.Attribute & Description1classDesignates the full package name of the bean.2typeSpecifies the type of the variable that will refer to the object.3beanNameGives the name of the bean as specified ...
Read MoreJavaTuples setAt0() method for Septet class
The setAt0() method is used to set the Septet value in JavaTuples and a copy with new value at the specified index i.e. index 0 here.Let us first see what we need to work with JavaTuples. To work with Septet class in JavaTuples, you need to import the following package −import org.javatuples.Septet;Note − Steps to download and run JavaTuples program. If you are using Eclipse IDE to run Septet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file.The following is an example −Exampleimport org.javatuples.Septet; import ...
Read MoreWhat is the use of jsp text action element?
The action can be used to write the template text in JSP pages and documents. Following is the simple syntax for this action −Template dataThe body of the template cannot contain other elements; it can only contain text and EL expressions (Note − EL expressions are explained in a subsequent chapter). Note that in XML files, you cannot use expressions such as ${whatever > 0}, because the greater than signs are illegal. Instead, use the gt form, such as ${whatever gt 0} or an alternative is to embed the value in a CDATA section.]]>If you need to include a ...
Read MoreJava Program to check if any String in the list starts with a letter
First, create a List with String elements:List myList = new ArrayList(); myList.add("pqr"); myList.add("stu"); myList.add("vwx"); myList.add("yza"); myList.add("bcd"); myList.add("efg"); myList.add("vwxy");Use the startsWith() method to check if any of the above string in the myList begins with a specific letter:myList.stream().anyMatch((a) -> a.startsWith("v"));TRUE is returned if any of the string begins with the specific letter, else FALSE.The following is an example to check if any String in the list starts with a letter:Exampleimport java.util.ArrayList; import java.util.List; public class Demo { public static void main(final String[] args) { List myList = new ArrayList(); myList.add("pqr"); myList.add("stu"); ...
Read MoreHow to get the number of records in a table using JDBC?
The ResultSet class doesn’t provide any direct method to get the number of records in a table.The beforeFirst() method navigates the pointer/curser of the ResultSet object to its default position before first.In the same way the last() method positions the cursor at the last row of the ResultSet object.Using these methods you can find the number of records in the current ResultSet object.ExampleAssume we have a table named customers table with contents as shown below:+----+---------+-----+---------+----------------+ | ID | NAME | AGE | SALARY | ADDRESS | +----+---------+-----+---------+----------------+ | 1 | Amit | 25 | 3000.00 ...
Read MoreHow to add items in a JComboBox on runtime in Java
The following is an example to add items on runtime on a JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComboBox combo = new JComboBox(new String[] { "One", "Two", "Three", "Four", "Five", "Six" }); JButton add = new JButton("Add"); add.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { ...
Read MoreWhat are JSP literals?
The JSP expression language defines the following literals −Boolean − true and falseInteger − as in JavaFloating point − as in JavaString − with single and double quotes; " is escaped as ", ' is escaped as ', and \ is escaped as \.Null − null
Read MoreHow to create Decade Tuple in Java?
Create Decade Tuple in Java using a constructor or with() method. Here, we will see how to create a Decade of Tuple using constructor.Let us first see what we need to work with JavaTuples. To work with Decade class in JavaTuples, you need to import the following package −import 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 ...
Read MoreHow to calculate the possibilities of duplication for random number within a range in Java
To get the duplicate numbers for random numbers in a range, loop through and create two Random class objects −Use nextInt() to get the next number −intrandVal1 = new Random().nextInt(50); intrandVal2 = new Random().nextInt(50);Now, compare both the above numbers −if (randVal1 == randVal2) { System.out.println("Duplicate number = "+randVal1); }All the above is to be done in a loop −for (int i = 1; i
Read MoreHow to handle action event for JComboBox in Java?
The following is an example to handle action event for JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComboBox combo = new JComboBox(new String[] { "One", "Two", "Three", "Four", "Five", "Six" }); JButton add = new JButton("Add"); add.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { ...
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