Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Create a combo box first and set some values −JComboBox comboBox = new JComboBox(new String[]{"Product1", "Product2", "Product3", "Product4"});Seth the JComboBox for the editor so that the editor uses the combo box −TreeCellEditor editor = new DefaultCellEditor(comboBox); tree.setEditable(true); tree.setCellEditor(editor);The following is an example to create a Default Cell Editor that uses a JComboBox −Examplepackage my; import javax.swing.DefaultCellEditor; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeCellEditor; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 ... Read More
You can use $gt operator for this. Let us first create a collection with documents −> db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[89, 43, 32, 45]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9e9f9b50a6c6dd317adb3") } > db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[32, 33, 34, 40]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9ea13b50a6c6dd317adb4") } > db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[45, 56, 66, 69]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9ea25b50a6c6dd317adb5") } > db.arrayElementsNotGreaterThanDemo.insertOne({"Scores":[46, 66, 77, 88]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9ea3cb50a6c6dd317adb6") }Following is the query to display all documents from a collection with the help of find() method −> db.arrayElementsNotGreaterThanDemo.find().pretty();This will produce the following output −{ ... Read More
The required attribute of the element is to let users know that the drop-down is required and need to be submitted before the form is submitted. If you won’t select the value from the drop-down and try to submit the form, it won’t submit and a warning would be visible on the web page itself. The required attribute introduced in HTML5.Following is the syntax−Let us now see an example to implement the required attribute of the element−Example Live Demo Candidate Profile Following are the details to be submitted by the candidate: Educational Qualification Graduation ... Read More
Trapezium is a type of quadrilateral that has at least one pair of side parallel to each other. Area and perimeter of a trapezium can be found using the below formula, Perimeter = sum of all sidesArea = ½ x (sum of the lengths of the parallel sides) x perpendicular distance between parallel sidesCode logic − The code will use 5 variables in as all sides of trapezium and one for the perpendicular distance between the two parallel side. For the area variable calculation we will take a float variable that will be initialised with the value. To calculate it ... Read More
The HTML DOM Input Date max property returns/sets max attribute of Input date type.SyntaxFollowing is the syntax −Returning string valueinputDateObject.maxSetting max to string valueinputDateObject.max = YYYY-MM-DDString ValuesHere, “YYYY-MM-DD” can be the following −stringValueDetailsYYYYIt defines year (eg:1998)MMIt defines month (eg: 05 for May)DDIt defines Day (eg: 24)ExampleLet us see an example of Input Date max property − Live Demo Input Date Max Date Select: Change Max Date var inputDate = document.getElementById("date"); var divDisplay = document.getElementById("divDisplay"); divDisplay.textContent = 'Max of date input: '+inputDate.max; function getMaxDate() { var oldInputDate = inputDate.max; ... Read More
Here we will see what is the use of ldexp() method in C or C++. This function returns any variable x raise to the power of exp value. This takes two arguments x and exp.The syntax is like below.float ldexp (float x, int exp) double ldexp (double x, int exp) long double ldexp (long double x, int exp) double ldexp (T x, int exp)Now let us see one example to get a better idea.Example#include #include using namespace std; int main() { double a = 10, res; int exp = 2; res = ldexp(a, exp); // Finds a*(2^exp) cout
Here we will see how to print numbers in a correct sequence using different threads. Here we will create n number of threads, then synchronize them. The idea is, the first thread will print 1, then second thread will print 2 and so on. When one thread is trying to print, it will lock the resource, so no thread can use that portion.Example#include #include #include #include pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t* cond = NULL; int threads; volatile int count = 0; void* sync_thread(void* num) { //this function is used to synchronize the threads int thread_number ... Read More
Whenever we execute SQL statements using the executeQuery() method, it returns a ResultSet object which holds the tabular data returned by the SELECT queries(in general).The ResultSet object contains a cursor/pointer which points to the current row. Initially this cursor is positioned before first row (default position).You can move the cursor of the ResultSet object to the first row from the current position, using the first() method of the ResultSet interface.rs.first()This method returns a boolean value specifying whether the cursor has been moved to the first row successfully.If there are no rows in the current ResultSet object this method returns false, else it ... Read More
Let’s say we have following MenuBar and menu in it -JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); menuBar.add(fileMenu);Now, we will create a MenuItem and separate it using the JSeparator():JMenuItem menuItem1 = new JMenuItem("New", KeyEvent.VK_N); fileMenu.add(menuItem1); // separating MenuItems fileMenu.add(new JSeparator());The following is an example to separate Menu Items in a Menu with Java -Examplepackage my; import java.awt.Color; import java.awt.event.KeyEvent; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JSeparator; import javax.swing.UIManager; public class SwingDemo { public static void main(final String args[]) { JFrame frame = new JFrame("MenuBar Demo"); ... Read More
Let us first create a MenuBar −JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE);To create a submenu for a Menu, the following is an example −Examplepackage my; import java.awt.Color; import java.awt.event.KeyEvent; import javax.swing.ButtonGroup; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JRadioButtonMenuItem; import javax.swing.UIManager; public class SwingDemo { public static void main(final String args[]) { JFrame frame = new JFrame("MenuBar Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); menuBar.add(fileMenu); ... Read More