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Articles on Trending Technologies
Technical articles with clear explanations and examples
How do I catch a Ctrl+C event in C++?
The CTRL + C is used to send an interrupt to the current executing task. In this program, we will see how to catch the CTRL + C event using C++.The CTRL + C is one signal in C or C++. So we can catch by signal catching technique. For this signal, the code is SIGINT (Signal for Interrupt). Here the signal is caught by signal() function. Then one callback address is passed to call function after getting the signal.Please see the program to get the better idea.Example#include #include #include #include using namespace std; // Define ...
Read MoreGet the count of the most frequently occurring values in MySQL?
For this, use the aggregate function COUNT() along with GROUP BY. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value int ); Query OK, 0 rows affected (0.74 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values(976); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Value) values(67); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Value) values(67); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Value) values(1); Query OK, 1 row affected (0.27 sec) mysql> ...
Read MoreWhat is instance variable hiding in Java?
Whenever you inherit a superclass a copy of superclass’s members is created at the subclass and you using its object you can access the superclass members.If the superclass and the subclass have instance variable of same name, if you access it using the subclass object, the instance variables of the subclass hides the instance variables of the superclass irrespective of the types. This mechanism is known as field hiding or, instance variable hiding.But, since it makes code complicated field hiding is not recommended.ExampleIn the following example we have two classes Super and Sub one extending the other. They both have ...
Read MoreJava Program to sort Integer list in reversed order
Following is our integer array:Integer[] arr = {20, 50, 100, 150, 200, 250, 300, 350, 400, 500};Now convert the above Integer array to List:List list = new ArrayList(Arrays.asList(arr));Now, to sort the above Integer list in reversed order:Comparator initialComp = Integer::compare; Comparator revComp = initialComp.reversed(); Collections.sort(list, revComp);The following is an example to sort Integer list in reversed order:Exampleimport java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String[] args) { Integer[] arr = {20, 50, 100, 150, 200, 250, 300, 350, 400, 500}; List list = new ...
Read MoreHow to determine whether C++ code has been compiled in 32 or 64 bit?
In C++, there is no direct way to check the environment architecture. There are two Macros for Windows systems, that can be used to check the architecture. These macros are _WIN64, and _WIN32. When the system is 64-bit, then the _WIN64 will be 1, otherwise the _WIN32 will be 1. So using macro checking, we can identify the architectureExample#include using namespace std; int main() { #ifdef _WIN64 cout
Read MoreHow to get notified when a notification is notified?
This example demonstrate about How to get notified when a notification is notifiedStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.package app.tutorialspoint.com.notifyme ; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.os.Bundle ; import android.support.v4.app.NotificationCompat ; import android.support.v7.app.AppCompatActivity ; import android.view.View ; public class MainActivity extends AppCompatActivity { public static final String NOTIFICATION_CHANNEL_ID = "10001" ; private final static String default_notification_channel_id = ...
Read MoreHow to add a title to JTable in Java Swing?
To display a title to the JTable, you can set a title for the JPanel, which already consists of a JTable.Here, we are using createTitledBorder() for the JPanel to set the title for the panel border that would eventually work for table title.Let’s say the following is the JPanel −JPanel panel = new JPanel();Now, use setBorder() and the BorderFactory class to set a title border for the panel that would be our table title as well −panel.setBorder(BorderFactory.createTitledBorder( BorderFactory.createEtchedBorder(), "My Demo Table", TitledBorder.LEFT, TitledBorder.TOP));The following is an example to add a title to a JTable −Examplepackage my; import javax.swing.BorderFactory; import ...
Read MoreHow to select a row where one of several columns equals a certain value in MySQL?
For this, you can use multiple OR. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(10), LastName varchar(10), Age int, CountryName varchar(10) ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('John', 'Smith', 21, 'US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('Carol', 'Taylor', 22, 'AUS'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('David', ...
Read MoreWhat are the default array values in Java?
In Java arrays are the reference types which stores multiple elements of the same datatype. You can create an array just like an object using the new keyword −type[] reference = new type[10];or, directly using the flower brackets ({}).int [] myArray = {10, 20, 30, 40, 50}When you create instance variables in Java you need to initialize them, else the compiler will initialize on your behalf with default values.Similarly, if you create an array as instance variable, you need to initialize it else the compiler initializes with default values which are −Integer − 0Byte − 0Float − 0.0Boolean − falseString/Object ...
Read MoreHow to sort array of strings by their lengths following shortest to longest pattern in Java
At first, let us create and array of strings:String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" };Now, for shortest to longest pattern, for example A, AB, ABC, ABCD, etc.; get the length of both the string arrays and work them like this:Arrays.sort(strArr, (str1, str2) -> str1.length() - str2.length());The following is an example to sort array of strings by their lengths with shortest to longest pattern:Exampleimport java.util.Arrays; public class Demo { public static void main(String[] args) { String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" }; ...
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