Use the getPreviousLeaf() method to get the previous leaf in a JTree. Here, we are displaying the leaf before this node “eight” on Console -System.out.println("Get Previous Leaf = "+eight.getPreviousLeaf());The following is an example to get the previous leaf 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 More

Use the getNextNode() method to get the next node after this node in Java. Here, we are displaying the next node of child node “eight” -System.out.println("Next node after this node = "+eight.getNextNode());The following is an example to return the next node after this node in 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 ... Read More

Use the getNextLeaf() method to get the leaf after this node in a JTree. Here, we are displaying the leaf after node “three” in Console −System.out.println("Next leaf after this node = "+three.getNextLeaf());The following is an example to get the leaf node after this node in a JTree component −package 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 ... Read More

An object is said to be an entity which has properties and types in it. Example, consider a Person as an object and it has properties like height, weight, age and salary. In the similar way JavaScript also have objects and their defined properties. An object in JavaScript is a complicated data type where it can store various data types in it. Let’s consider this example below const employee = { name : ‘Dhoni’, age : 41, height : 5.8, } Cloning an object using JavaScript In general, “Cloning” is ... Read More

Mark and Sweep algorithmMark and Sweep algorithm looks out for objects 'which are unreachable' rather than objects 'which are no longer needed'. This algorithm is the improvement of Reference-counting algorithm.This algorithm actually goes through 3 important steps. Root: In general, a root is a global variable that is used in the code. A window object in javascript can act as a   root. This algorithm uses global object root to find whether the objects are reachable or unreachable.This algorithm then monitors every root and also their children. While monitoring, some objects which are reachable are marked and remaining objects which are ... Read More

The Java SimpleDateFormat class provides convert between a Java String to a Date or Date to String. Example import java.util.Date; import java.text.SimpleDateFormat; import java.util.Calendar; public class SimpleDateFormatTest { public static void main(String[] args) { // get today's date Date today = Calendar.getInstance().getTime(); // create a date "formatter" SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-hh.mm.ss"); // create a new String using the date format String formattedDate = formatter.format(today); // prints converted date to string format System.out.println(" Date is:" + formattedDate); } } Output Date is:2023-11-21-10.39.16

A Java program can be classified into two types, one is an Application and another is an Applet.ApplicationAn application is a stand-alone java program that runs with the support of a virtual machine in a client or server-side.A java application is designed to perform a specific function to run on any Java-compatible virtual machine regardless of the computer architecture.An application is either executed for the user or for some other application program.Examples of java applications include database programs, development tools, word processors, text and image editing programs, spreadsheets, web browsers, etc.Examplepublic class Demo {    public static void main(String args[]) ... Read More

The NullPointerException is a subclass of the RuntimeException class. It is defined in java.lang package of Java. In this article, we are going to understand the reasons for NullPointerException and how to resolve them. Reason for NullPointerException in Java A NullPointerException is a runtime exception thrown by the JVM when our application code, another referenced API, or the middleware encounters the following conditions: Attempting to invoke an instance method of a null object. ... Read More

Let’s say we have lots of content in our JTextPane component −textPane.setText("This is demo text1. This is demo text2. This is demo text3."    + "This is demo text4.This is demo text5. This is demo text6. "    + "This is demo text7. This is demo text8. This is demo text9. "    + "This is demo text10. This is demo text11. This is demo text12."    + "This is demo text13. This is demo text13. This is demo text14."    + "This is demo text15. This is demo text13. This is demo text16."    + " This is demo ... Read More

To highlight all the text, use the selectAll() method of the JTextPane component −JTextPane pane = new JTextPane(); pane.selectAll();The following is an example to highlight the JTextPane text. Here, we are displaying a code in the JTextPane and highlighting it −Examplepackage my; import java.awt.BorderLayout; import java.awt.Container; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextPane; import javax.swing.text.BadLocationException; public class SwingDemo {    public static void main(String args[]) throws BadLocationException {       JFrame frame = new JFrame("Demo");       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       Container container = frame.getContentPane();       JTextPane pane = new JTextPane();       pane.setContentType("text/html");     ... Read More