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Here we will see how to check whether a given input is integer string or a normal string. The integer string will hold all characters that are in range 0 – 9. The solution is very simple, we will simply go through each characters one by one, and check whether it is numeric or not. If it is numeric, then point to the next, otherwise return false value.Example#include using namespace std; bool isNumeric(string str) { for (int i = 0; i < str.length(); i++) if (isdigit(str[i]) == false) return false; //when one ... Read More
The following is an example to draw a line on a JFrame −Examplepackage my; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Line2D; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo extends JFrame { public SwingDemo() { JPanel panel = new JPanel(); getContentPane().add(panel); setSize(550, 300); } public void paint(Graphics gp) { super.paint(gp); Graphics2D graphics = (Graphics2D) gp; Line2D line = new Line2D.Float(200, 150, 150, 220); graphics.draw(line); } public static void main(String[] args) { SwingDemo demo = new SwingDemo(); demo.setVisible(true); } }Output
This example demonstrate about How to implement an Android notification action without opening the app.Step 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.app.PendingIntent ; import android.content.Intent ; 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" ... Read More
To set TabLayout Policy to JTabbedPane in Java when all the tabs does not fit in a single run, use the method setTabLayoutPolicy() −JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);Above we have set the constant to be SCROLL_TAB_LAYOUT, which is a tab layout policy for providing a subset of available tabs when all the tabs will not fit within a single run.The following is an example −package my; import javax.swing.*; import java.awt.*; import java.awt.event.KeyEvent; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Devices"); JTabbedPane tabbedPane = new JTabbedPane(); ... Read More
Use the following constants for the JScrollBar to display the vertical and horizontal scrollbars always even if it is not required −scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);The following is an example to display the vertical and horizontal scrollbars always even if it is not required −Examplepackage my; import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.Box; 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("Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton button1 = new JButton("Questions and Answers"); JButton button2 = new JButton("Videos"); JButton ... Read More
Use $slice operator for this. Let us first create a collection with documents −> db.gettingFirstItemInArrayDemo.insertOne( { "UserId": 101, "UserName":"Carol", "UserOtherDetails": [ {"UserFriendName":"Sam"}, {"UserFriendName":"Mike"}, {"UserFriendName":"David"}, {"UserFriendName":"Bob"} ] } ); { "acknowledged" : true, "insertedId" : ObjectId("5cdfca52bf3115999ed51205") }Following is the query to display all documents from a collection with the help of find() method −> db.gettingFirstItemInArrayDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cdfca52bf3115999ed51205"), "UserId" : 101, ... Read More
A DATALINK object represents an URL value which refers to an external resource (outside the current database/data source), which can be a file, directory etc..MySQL does not provide any separate datatype to store DATALINK/URL value you need to store using TEXT or VARCHAR datatypes as shown in the following query −CREATE TABLE tutorials_data ( tutorial_id INT PRIMARY KEY AUTO_INCREMENT, tutorial_title VARCHAR(100), tutorial_author VARCHAR(40), submission_date date, tutorial_link VARCHAR(255) );Following JDBC program establishes a connection with MYSQL database, creates a table with name tutorials_data. In this table we are creating a column with name tutorial_link which stores ... Read More
The HTML DOM Input URL defaultValue property sets/returns the default value corresponding to URL Input. The value attribute changes as the user types in the URL input but default value does not change.SyntaxFollowing is the syntax −Returning string valueinputURLObject.defaultValueSetting defaultValue to stringinputURLObject.defaultValue = ‘string’ExampleLet us see an example of Input URL defaultValue property − Live Demo Input URL defaultValue form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { ... Read More
Here we will see how to convert bool to int equivalent in C++. Bool is a datatype in C++, and we can use true or false keyword for it. If we want to convert bool to int, we can use typecasting. Always true value will be 1, and false value will be 0.Example#include using namespace std; main() { bool my_bool; my_bool = true; cout
To change JLabel font, use the setFont() method −JLabel lable = label.setFont(new Font("Verdana", Font.PLAIN, 18));Examplepackage my; import java.awt.Font; import javax.swing.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Label Example"); JLabel label; label = new JLabel("First Label"); label.setBounds(50, 50, 100, 30); label.setFont(new Font("Verdana", Font.PLAIN, 18)); frame.add(label); frame.setSize(300,300); frame.setLayout(null); frame.setVisible(true); } }Output