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
Why is operator overloading not supported by java?
When a class has two or more methods by the same name but different parameters, at the time of calling based on the parameters passed respective method is called (or respective method body will be bonded with the calling line dynamically). This mechanism is known as method overloading.Operator overloadingOperator overloading is the ability to redefine the functionality of the operators. Programming languages like c++ supports operator overloading.you can redefine or overload most of the built-in operators available in C++. Thus, a programmer can use operators with user-defined types as well.Overloaded operators are functions with special names: the keyword "operator" followed ...
Read MoreHow can I check if there are any selected items in Java JList
To check if there are any selected items, use the following:boolean res = !list.isSelectionEmpty();The value of res would be TRUE IF we have a selected item in the JList.The following is an example to check if there are any selected items 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[]= {"Squash", ...
Read MoreWhat is ResultSet holdability in JDBC?
ResultSet holdability determines whether the ResultSet objects (cursors) should be closed or held open when a transaction (that contains the said cursor/ ResultSet object) is committed using the commit() method of the Connection interface.You can set the ResultSet holdability using the setHoldability() method of the Connection interface.con.setHoldability(ResultSet.CLOSE_CURSORS_AT_COMMIT);The ResultSet interface provides two values to specify the holdability of a ResultSet namely CLOSE_CURSORS_AT_COMMIT and, HOLD_CURSORS_OVER_COMMIT.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), ...
Read MoreWhat is CLOSE_CURSORS_AT_COMMIT in JDBC?
CLOSE_CURSORS_AT_COMMIT is the constant value of the ResultSet interface representing the holdability value. If the ResultSet holdability is set to this value whenever you commit/save a transaction using the commit() method of the Connection interface, the ResultSet objects created in the current transaction (that are already opened) will be closed.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );Now, we will insert 7 records in MyPlayers table ...
Read MoreDisplay dates after NOW() + 10 days from a MySQL table?
You can use DATE_ADD() function with where clause for this. Let us first create a table −mysql> create table DemoTable ( ShippingDate date ); Query OK, 0 rows affected (0.54 sec)Note : The current date and time is as follows, we found using NOW() −mysql> select now(); +-----------------------+ | now() | +-----------------------+ | 2019-06-04 20 :43 :57 | +-----------------------+ 1 row in set (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-06-16'); Query OK, 1 ...
Read MoreCan we overload a method based on different return type but same argument type and number, in java?
When a class has two or more methods by the same name but different parameters, at the time of calling based on the parameters passed respective method is called (or respective method body will be bonded with the calling line dynamically). This mechanism is known as method overloading.Exampleclass Test{ public int division(int a, int b){ int result = a/b; return result; } public double division (float a, float b){ double result = a/b; ...
Read Moregetopt() function in C to parse command line arguments
The getopt() is one of the built-in C function that are used for taking the command line options. The syntax of this function is like below −getopt(int argc, char *const argv[], const char *optstring)The opstring is a list of characters. Each of them representing a single character option.This function returns many values. These are like below −If the option takes a value, then that value will be pointed by optarg.It will return -1, when no more options to procesReturns ‘?’ to show that this is an unrecognized option, it stores it to optopt.Sometimes some options need some value, If the ...
Read MoreRemove last char if it's a specific character in MySQL?
To remove last char if it is a specific character then use SUBSTRING(). Let us first create a table −mysql> create table DemoTable ( SubjectName varchar(100) ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('MySQL'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('MongoDB?'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Java?'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('C'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select ...
Read MoreHow to separate Components in a Row or Column with Box in Java
To separate components in a row or column, use the createGlue() method. This creates an invisible "glue" component that separates components.The following is an example to separate components in a row or column with Box −Examplepackage my; import java.awt.BorderLayout; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollPane; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Matches"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton button1 = new JButton("CSK"); JButton button2 = new JButton("DC"); JButton button3 = new JButton("MI"); JButton ...
Read MoreHow to launch a program using C++ program?
Here we will see how to start some third-party application like notepad or anything using C++ program. This program is very simple, we can use command prompt command to do this task.We will pass the application name inside the system() function. This will open it accordingly.Example#include using namespace std; int main() { cout >> "Opening Nodepad.exe" >> endl; system("notepad.exe"); }Output
Read More