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Programming Articles
Page 2461 of 2547
Java Program to select the first item in JList
To select the first item in JList, use setSelectionInterval() method:String values[]= { "One", "Two", "Three", "Four", "Five", "Six"}; JList list = new JList(values); int begn = 0; int end = 0; list.setSelectionInterval(begn, end);The following is an example to select the first item in JList:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String values[]= ...
Read MoreIs there a difference between copy initialization and direct initialization in C++?
The Copy initialization can be done using the concept of copy constructor. As we know that the constructors are used to initialize the objects. We can create our copy constructor to make a copy of some other object, or in other words, initialize current object with the value of another object. On the other hand, the direct initialization can be done using assignment operation.The main difference between these two types of initialization is that the copy initialization creates a separate memory block for the new object. But the direct initialization does not make new memory space. It uses reference variable ...
Read MoreHow to make JOptionPane to handle Yes, No and Closed buttons in Java?
For this, create JOptionPane.QUESTION_MESSAGE and with the user action display individual messages, for example −int res = JOptionPane.showOptionDialog(new JFrame(), "Do you like Cricket?", "Hobbies", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[] { "Yes", "No" }, JOptionPane.YES_OPTION); if (res == JOptionPane.YES_OPTION) { System.out.println("Selected Yes!"); }Above, we have displayed a message on console if the user will selects YES button. The following is an example to make JOptionPane to handle Yes, No and Closed buttons −Examplepackage my; import javax.swing.JFrame; import javax.swing.JOptionPane; public class SwingDemo { public static void main(String args[]) { int res = JOptionPane.showOptionDialog(new JFrame(), "Do you like ...
Read MoreJava Program to set Selection Mode for JList only for single selection
To set single selection for JList, use DefaultListSelectionModel and set it to SINGLE_SELECTION:String values[]= { "One", "Two", "Three", "Four", "Five", "Six"}; JList list = new JList(values); list.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);The following is an example to set the selection mode for JList only for single selection:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String values[]= { ...
Read MoreWhen should I write the keyword 'inline' for a function/method in C++?
In C++, the inline keyword is used in different places. To create inline variables, or inline namespace, and as well as to create inline methods or functions.C++ inline function is powerful concept that is commonly used with classes. If a function is inline, the compiler places a copy of the code of that function at each point where the function is called at compile time.Any change to an inline function could require all clients of the function to be recompiled because compiler would need to replace all the code once again otherwise it will continue with old functionality.To inline a ...
Read MoreJava program to get the previous sibling from a JTree
Use the getPreviousSibling() method to get the previous sibling. Here, we are getting the previous sibling of child node “five” and displaying on Console −System.out.println("Get Previous Sibling = "+five.getPreviousSibling());The following is an example to get the previous sibling from a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 - P66779)"); ...
Read MoreHow to store string array in Java JList?
To store string array in JList, at first create String array list:String sports[]= { "Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"};Now, set it to JList:JList list = new JList(sports);The following is an example to store string array in JList:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String sports[]= {"Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"}; ...
Read MoreHow do I convert between big-endian and little-endian values in C++?
Here we will see how to convert Little endian value to Big endian or big endian value to little endian in C++. Before going to the actual discussion, we will see what is the big endian and the little endian?In different architectures, the multi-byte data can be stored in two different ways. Sometimes the higher order bytes are stored first, in that case these are known as big endian, and sometimes the lower order bytes are stored first, then it is called little endian.For example, if the number is 0x9876543210, then the big endian will be −The little endian will ...
Read MoreHow to display the JList items from top to bottom and left to right in Java?
For this, set the layout orientation to the following −setLayoutOrientation(JList.VERTICAL_WRAP);The following is an example to display the JList items from top to bottom and left to right −Examplepackage my; import java.awt.BorderLayout; import java.util.ArrayList ; import java.util.List; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JScrollPane; public class SwingDemo { public static void main(String[] args) { JPanel panel = new JPanel(new BorderLayout()); List myList = new ArrayList(10); for (int index = 0; index < 20; index++) { myList.add("List Item " + index); } ...
Read MoreJava Connection commit() method with example
The commit() method of the Connection interface saves all the modifications made since the last commit.con.save()If any issue occurs after the commit you can revert all the changes done till this commit by invoking the rollback() method.Con.rollback()To commit a transactionRegister the driver using the registerDriver() method of the DriverManager class as −//Registering the Driver DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get the connection using the getConnection() method of the DriverManager class as −//Getting the connection String url = "jdbc:mysql://localhost/mydatabase"; Connection con = DriverManager.getConnection(url, "root", "password");Turn off the auto-commit using the setAutoCommit() method as −//Setting the auto commit false con.setAutoCommit(false);Commit the transaction using the commit() method as −con.commit();Let us create a table with ...
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