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The duration can be obtained in a 24 hour format using the ofDays() method in the Duration class in Java. This method requires a single parameter i.e. the number of days and it returns the duration in a 24 hour format. If the capacity of the duration is exceeded, then the ArithmeticException is thrown.A program that demonstrates this is given as follows −Example Live Demoimport java.time.Duration; public class Demo { public static void main(String[] args) { long days = 1; Duration duration = Duration.ofDays(days); ... Read More
The set() method of the CopyOnWriteArrayList class is used to replace the element at the specified position in this list with the specified element. It returns the element that gets replaced.The syntax is as followspublic E set(int index, E ele)Here, the parameter index is the index of the element to replace and ele is the element to be stored at the specified position.To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class set() method in JavaExample Live Demoimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] ... Read More
To create Decade Tuple from array in Java, use the fromArray() method. Here, we will see how to create a Decade Tuple using the fromArray() method. Let us first see what we need to work with JavaTuples. To work with Decade class in JavaTuples, you need to import the following package:import org.javatuples.Decade;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to ... Read More
Following is the syntax to drop all indexes from all collections in a MongoDB database using command linedb.getCollectionNames().forEach(function(yourVariableName) { db.runCommand({dropIndexes: yourVariableName, index: "*"}); });The above syntax will drop all indexes except _id.Let us check the current database. Following is the query> dbThis will produce the following outputTestFollowing is the query to let us show some indexes from a collection before dropping indexes> db.indexingDemo.getIndexes();This will produce the following output[ { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_", ... Read More
To hide a keyboard on screen we need to make use of some internal functions that are predefined in the iOS SDK. The keyboard appears on screen when we are typing in a text Field or textView. We need to make use of internal function according to the text field.For example if the current text field is tfOne, we can hide the text field using the code below:tfOne.resignFirstResponder()This code will hide the keyboard when ever called, we may call this on an action for a button or for gesture recognizer.This method is good for limited textFields, but we need to ... Read More
You need to use tinyint(1) unsigned NULL to store the value 0, 1 and null values. The syntax is as follows −yourColumnName TINYINT(1) UNSIGNED NULL;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table StoreValue0and1orNULLDemo -> ( -> isDigit TINYINT(1) UNSIGNED NULL -> ); Query OK, 0 rows affected (0.63 sec)Now you can insert records 0, 1, and NULL in the table using insert command. The query is as follows −mysql> insert into StoreValue0and1orNULLDemo values(0); Query OK, 1 row ... Read More
The value of the chronological unit can be obtained using the method get() in the Duration class in Java. This method requires a single parameter i.e. the TemporalUnit for which the value is required. Also, the value of the chronological unit is returned by this method.A program that demonstrates this is given as follows −Example Live Demoimport java.time.Duration; import java.time.temporal.*; public class Demo { public static void main(String[] args) { Duration d = Duration.ofMinutes(2); System.out.println("The duration in minutes is: " + d); long seconds = d.get(ChronoUnit.SECONDS); System.out.println("The ... Read More
The contains() method is used to search a value in Triplet class.Let us first see what we need to work with JavaTuples. To work with Triplet class in JavaTuples, you need to import the following package −import org.javatuples.Triplet;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Triplet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file.The following is an example −Exampleimport org.javatuples.Triplet; public class Demo { public static void main(String[] args) { Triplet ... Read More
JDBC API is available in two packages java.sql, core API and javax.sql JDBC optional packages. Following are the important classes and interfaces of JDBC.Class/interfaceDescriptionDriverManagerThis class manages the JDBC drivers. You need to register your drivers to this.It provides methods such as registerDriver() and getConnection().DriverThis interface is the Base interface for every driver class i.e. If you want to create a JDBC Driver of your own you need to implement this interface. If you load a Driver class (implementation of this interface), it will create an instance of itself and register with the driver manager.StatementThis interface represents a static SQL statement. ... Read More
This example demonstrate about How to get default phone IMEI 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.xml. In the above code, we have taken a text view to show phone IMEI.Step 3 − Add the following code to java/MainActivity.xmlpackage com.example.myapplication; import android.Manifest; import android.content.Context; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.RequiresApi; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.telephony.TelephonyManager; import android.widget.TextView; import static android.Manifest.permission.READ_PHONE_NUMBERS; import static ... Read More