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The following is an example to handle action event for JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComboBox combo = new JComboBox(new String[] { "One", "Two", "Three", "Four", "Five", "Six" }); JButton add = new JButton("Add"); add.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { ... Read More
Now let us see a program of Intel 8085 Microprocessor. In this program we will see how to do different operations on BCD numbers based on choice.Problem Statement:Write 8085 Assembly language program to perform some operations on two 8-bit BCD numbers base on choice.Discussion:In this program we are taking a choice. The choice value is stored at memory location 8000H (named as X). And the BCD numbers are stored at location 8001H and 8002H. We are storing the result at location 8050H and 8051H.Here if the choice is 00H, then it will perform addition, for 01H, it will perform subtraction, ... Read More
A direct byte buffer can be allocated using the method allocateDirect() in the class java.nio.ByteBuffer. This method requires a single parameter i.e. the capacity in bytes and it returns the direct byte buffer. If the capacity provided is negative, then the IllegalArgumentException is thrown.A program that demonstrates this is given as follows −Example Live Demoimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { ByteBuffer buffer = ByteBuffer.allocateDirect(n); byte[] byteValues = { 7, 1, 6, 3, ... Read More
You can use aggregate and unwind the array list before applying match. To understand the above concept, let us create a collection with documents. The query to create a collection with document is as follows:> db.filterArray.insertOne( { "L": [{ "N":1 }, { "N":2 } , { "N":3 }, { "N":4 }, { "N":5 } ]});The following is visible after running the above query:{ "acknowledged" : true, "insertedId" : ObjectId("5c6d63f2734e98fc0a434aeb") }Display document from a collection with the help of find() method. The query is as follows:> db.filterArray.find().pretty();The following is the output:{ "_id" : ObjectId("5c6d63f2734e98fc0a434aeb"), "L" : [ ... Read More
This example demonstrate about How to get full screen activity 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 the digital clock view to show a clock.Step 3− Add the following code to java/MainActivity.xmlpackage com.example.myapplication; import android.annotation.TargetApi; import android.content.pm.ActivityInfo; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.Window; import android.view.WindowManager; public class MainActivity extends AppCompatActivity { @TargetApi(Build.VERSION_CODES.LOLLIPOP) ... Read More
The count() method of the LongStream class in Java is used to return the count of elements in this stream.The syntax is as follows.long count()To use the LongStream class in Java, import the following package.import java.util.stream.LongStream;Create a LongStream and add some elements.LongStream longStream = LongStream.of(50L, 30L, 80L, 40L, 15L, 60L);Now, get the count of elements.longStream.count()The following is an example to implement LongStream count() method in Java.Example Live Demoimport java.util.stream.LongStream; public class Demo { public static void main(String[] args) { LongStream longStream = LongStream.of(50L, 30L, 80L, 40L, 15L, 60L); System.out.println("The number of elements in the ... Read More
static_cast − This is used for the normal/ordinary type conversion. This is also the cast responsible for implicit type coersion and can also be called explicitly. You should use it in cases like converting float to int, char to int, etc.dynamic_cast − This cast is used for handling polymorphism. You only need to use it when you're casting to a derived class. This is exclusively to be used in inheritance when you cast from base class to derived class.Regular Cast − This is the most powerful cast available in C++ as it combines const_cast, static_cast and reinterpret_cast. but it's also ... Read More
PyMongo is a Python distribution containing tools for working with MongoDB. Use the following syntax to use a variable for collection name −var yourVariableName="yourCollectionName"; db[storeCollectionName].yourOperationName;To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows. We have used variable for collection name −> var storeCollectionName="new_Collection"; > db[storeCollectionName].insertOne({"UserName":"John", "UserAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c912aea4afe5c1d2279d6a0") } > db[storeCollectionName].insertOne({"UserName":"Carol", "UserAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5c912af54afe5c1d2279d6a1") } > db[storeCollectionName].insertOne({"UserName":"Mike", "UserAge":27}); { "acknowledged" : true, "insertedId" : ObjectId("5c912afe4afe5c1d2279d6a2") }Display ... Read More
In MySQL, we give an alias name for a column. Similarly, you can give an alias name for field name in MongoDB. The MongoDB equivalent syntax is as followsdb.yourCollectionName.aggregate( [ { "$project": { "_id": 0, "anyAliasName": "$yourFieldName" }} ]);Let us first create a collection with documents> db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d448827b86948e204ca91") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Robert"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449027b86948e204ca92") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Sam"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449527b86948e204ca93") } > db.selectFieldAsAnotherNameDemo.insertOne({"Name":"Mike"}); { "acknowledged" : true, "insertedId" : ObjectId("5c9d449927b86948e204ca94") ... Read More
At first, create a Random class object −Random rand = new Random();Now, create a new array −int num; int arr[] = new int[10];Loop through and set the Random nextInt with 20 as parameter since you want random numbers less than 20 −for (int j = 0; j