For this, use MongoDB $substr. Let us first create a collection with documents −> dblimitTheNumberOfCharactersDemoinsertOne({"Title":"MongoDB is No SQL database"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cf23013b64a577be5a2bc0e") } > dblimitTheNumberOfCharactersDemoinsertOne({"Title":"MySQL is a relational database"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cf2302db64a577be5a2bc0f") } Following is the query ... Read More

To check if two nodes are equal, use the equals() method. Here, we are checking that node1 and node2 are equal or not.node1.equals(node2)The following is an example to check if two nodes are equal in a JTree −package my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo {   ... Read More

Set the following to FALSE to enable the display of hidden files −JFileChooser file = new JFileChooser(); file.setFileHidingEnabled(false);The following is an example to enable the display of hidden files in a JFileChooser −Examplepackage my; import javax.swing.JFileChooser; public class SwingDemo {    public static void main(String[] args) {       ... Read More

The currentTarget event property in HTML is used to get the element whose event listeners triggered the event.Following is the syntax −event.currentTargetLet us now see an example to implement the currentTarget event property −Example Live Demo Get the element Click on this line to generate an alert box displaying ... Read More

This example demonstrate about How to turn Android device screen on and off programmatically.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     ... Read More

This example demonstrate about How to lock the Android device programmatically.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           ... Read More

This example demonstrate about How to align views at the bottom of the screen in Android.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.java ... Read More

This example demonstrate about How to make an Android device vibrate programmatically.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.java     Step 3 ... Read More

You can use CONCAT() function for this. Let us first create a table −mysql> create table DemoTable    (    UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    UserName varchar(100)    ); Query OK, 0 rows affected (0.43 sec)Insert records in the table using insert command −mysql> insert into DemoTable(UserName) ... Read More

This example demonstrate about How to use AutoCompleteTextView in Android 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.java     Step 3 − ... Read More