Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
How to display a value when select a JList item in Java?
A JList is a subclass of JComponent class that allows the user to choose either a single or multiple selections of items. A JList can generate a ListSelectiionListener interface and it includes one abstract method valueChanged(). We can display a value when an item is selected from a JList by implementing MouseListener interface or extending MouseAdapter class and call the getClickCount() method with single-click event (getClickCount() == 1) of MouseEvent class.Exampleimport javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; public class JListItemSeletionTest extends JFrame { private JList list; private JScrollPane jsp; private Vector data; public JListItemSeletionTest() { setTitle("JListItemSeletion Test"); ...
Read MoreMaximum XOR value of a pair from a range in C++
Problem statementGiven a range [L, R], we need to find two integers in this range such that their XOR is maximum among all possible choices of two integersIf the given range is L = 1 and R = 21 then the output will be 31 as − 31 is XOR of 15 and 16 and it is maximum within range.Algorithm1. Calculate the (L^R) value 2. From most significant bit of this value add all 1s to get the final resultExample#include using namespace std; int getMaxXOR(int L, int R){ int LXR = L ^ R; int msbPos = ...
Read MoreMaximum width of a binary tree in C++
Problem statementGiven a binary tree, write a function to get the maximum width of the given tree. The width of a tree is the maximum of widths of all levels.Consider below tree − 10 / \ 7 4 / \ \ 9 2 1 / \ 2 5 1. Width at level 1: 1 2. Width at level 2: 2 3. Width at level 3: 3 4. Width at level 4: 2 For above tree answer is 3.Algorithm1. Use ...
Read MoreMaximum weight transformation of a given string in C++
Problem statementGiven a string consisting of only A’s and B’s. We can transform the given string to another string by toggling any character. Thus many transformations of the given string are possible. The task is to find the Weight of the maximum weight transformation.Weight of a sting is calculated using below formula −Weight of string = Weight of total pairs + weight of single characters - Total number of toggles.Two consecutive characters are considered a pair only if they are different.Weight of a single pair (both characters are different) = 4Weight of a single character = 1If the input string ...
Read MoreWhat is the resemblance of COALESCE() function with IF-THEN-ELSE statement?
As we know that COALESCE() function returns first non-NULL value from the list of values. The following IF-THEN-ELSE statement is equivalent to COALESCE() function.IF value1 is not NULL THEN output = value1; ELSIF value2 is not NULL THEN output = value2; ELSIF value3 is not NULL THEN output = value3; . . . ELSIF valueN is not NULL THEN output = valueN; ELSE output = NULL; END IF;
Read MoreWhat MySQL COALESCE() function returns if all the arguments provided to it are NULL?
If all the values in MySQL COALESCE() function are NULL then it returns NULL as the output. It means that this function does not find any non-NULL value in the list.Examplemysql> Select COALESCE(NULL, NULL, NULL, NULL); +----------------------------------+ | COALESCE(NULL, NULL, NULL, NULL) | +----------------------------------+ | NULL | +----------------------------------+ 1 row in set (0.00 sec)
Read MoreHow can we split the name string into two parts by using MySQL SUBSTRING_INDEX() function?
To make it understand, we are using the following data from a table named ‘customerdetail’.mysql> Select * from Customerdetail; +----------------------+----------------------+-----------+---------------------+ | Name | FName | Address | Emailid | +----------------------+----------------------+-----------+---------------------+ | Advik Jhamb | Lovkesh Jhamb | Mumbai | Advik@gmail.com | | Chirag Jai Patil | Raman Jai Patil | Gujrat | chirahp@yahoo.com | | Devansh Singh Rajput | Kishore Singh Rajput ...
Read MoreHow can we split an IP Address into four respective octets by using MySQL SUBSTRING_INDEX() function?
Suppose we have a table named ‘ipaddress’ which contains the IP addresses as its values in column ‘IP’ as follows −mysql> Select * from ipaddress; +-----------------+ | ip | +-----------------+ | 192.128.0.5 | | 255.255.255.255 | | 192.0.255.255 | | 192.0.1.5 | +-----------------+ 4 rows in set (0.10 sec)Now with the help of SUBSTRING_INDEX() function in the following query, we can divide the IP address in four octets −mysql> Select IP, SUBSTRING_INDEX(ip, '.', 1)AS '1st Part', -> SUBSTRING_INDEX(SUBSTRING_INDEX(ip, '.', 2), '.', -1)AS '2nd Part', ...
Read MoreHow many types of selection modes for a JList in Java?
A JList is a component that can extend JComponent class used to display a list of objects that allows the user to select one or more items.There are three types of selection modes for a JList in JavaListSelectionModel.SINGLE_SELECTION: Only one list index can be selected at a time.ListSelectionModel.SINGLE_INTERVAL_SELECTION: Only one contiguous interval can be selected at a time.ListSelectionModel.MULTIPLE_INTERVAL_SELECTION: In this mode, there is no restriction on what can be selected. This is a default mode.Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class JListSelectionModeTest extends JFrame implements ActionListener { private JList list; private DefaultListModel listModel; public JListSelectionModeTest() { ...
Read MoreHow can I check the status of MySQL Server?
With the help of ‘mysqladmin’ along with ‘status’ option program we would be able to check the status of MySQL server. It can be used as follows on command line −C:\mysql\bin>mysqladmin -u root status Uptime: 3865 Threads: 1 Questions: 50 Slow queries: 0 Opens: 113 Flush tables: 1 Open tables: 102 Queries per second avg: 0.012
Read More