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Let us first create a collection with documents −> db.findByObjectIdDemo.insertOne({"ClientName":"Larry", "ClientAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cd657806ebf1256f11a") } > db.findByObjectIdDemo.insertOne({"ClientName":"Chris", "ClientAge":26}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cdc57806ebf1256f11b") } > db.findByObjectIdDemo.insertOne({"ClientName":"David", "ClientAge":38, "isMarried":true}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cf657806ebf1256f11c") }Following is the query to display all documents from a collection with the help of find() method −> db.findByObjectIdDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd68cd657806ebf1256f11a"), "ClientName" : "Larry", "ClientAge" : 23 } { "_id" : ObjectId("5cd68cdc57806ebf1256f11b"), "ClientName" : "Chris", "ClientAge" : 26 } { ... Read More
The autocomplete attribute of the element allows you to set whether the autocomplete for the input should be on or off. The web browser automatically fills the values if autocomplete is on. This only happens if the user already entered values before.Following is the syntax −Above, on | off values are to be set for autocomplete to appear or not. Set on if you want the browser to complete the entries based on previously entered values, whereas off doesn’t allow to complete the entries.Let us now see an example to implement the autocomplete attribute of the element −Example Live Demo ... Read More
It does't matter how many lines of code you write in a program. When you want to remove or delete any elements from the Python list, you have to think about the difference between remove, del and pop in Python List and which one to useremove : remove() removes the first matching value or object, not a specific indexing. lets say list.remove(value)Examplelist=[10, 20, 30, 40] list.remove(30) print(list)Output[10, 20, 40]del : del removes the item at a specific index. lets say del list[index]Examplelist = [10, 20, 30, 40, 55] del list[1] print(list)Output[10, 30, 40, 55]pop : pop removes the item at a specific index and returns ... Read More
Since JSE1.5 you can pass a variable number of values as argument to a method. These arguments are known as var args and they are represented by three dots (…)Syntaxpublic myMethod(int ... a) { // method body }Rules to follow while using varargs in JavaWe can have only one variable argument per method. If you try to use more than one variable arguments a compile time error is generated.ExampleIn the following Java example we are trying to accepts two varargs from the method sample().public class VarargsExample{ void demoMethod(int... ages), String... names) { ... Read More
We can find a substring inside a string in two ways. One way is using the indexOf() method and the other is using ES6 includes() method. let's discuss them in detail.indexOf()syntaxindexOf(str);This method tries to check the index of the substring we need. If there is index, which means substring is present, then true will be displayed in the output else false will be displayed as output. This method is case sensitive. ExampleLive Demo var company = "Tutorix"; document.write(company.indexOf('Tutor') !== -1); document.write(""); document.write(company.indexOf('tutor') !== -1); Outputtrue falseincludes()syntaxincludes(str);Unlike the indexOf() ... Read More
GCDGCD stands for Greatest Common Divisor of two or more integers excluding 0Like, to find the greatest common divisor of 48 and 18048 = 2 × 2 × 2 × 2 × 3180 = 2 × 2 × 3 × 3 × 5Greatest common divisor = 2 × 2 × 3 = 12.In the given problem, N lines should be printed with elements have GCD as specifiedInput : N=2 GCD=2 Ouput : 2-4-6-10 14-16-18-22AlgorithmSTART Step 1 -> take input n(e.g. 2) and k(e.g. 2) as int values and i Step 2-> Loop For i to 0 and i end loop ... Read More
Here we will see how the copy constructors are implemented in C++. Before discussing that we should know what is the copy constructor.The copy constructor is a constructor which creates an object by initializing it with an object of the same class, which has been created previously. The copy constructor is used to −Initialize one object from another of the same type.Copy an object to pass it as an argument to a function.Copy an object to return it from a function.If a copy constructor is not defined in a class, the compiler itself defines one. If the class has pointer ... Read More
For Button border, use createLineBorder() method in Java, which allows you to set the color of the Border as well:JButton button = new JButton("Demo Button!"); Border border = BorderFactory.createLineBorder(Color.BLUE);The following is an example to change button border in Java:Exampleimport java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Button Border"); Container container = frame.getContentPane(); JButton button = new JButton("Demo Button!"); Border border = BorderFactory.createLineBorder(Color.BLUE); button.setBorder(border); ... Read More
The supportsStoredProcedures() method of the DatabaseMetaData interface is used to determine whether the underlying database supports stored procedures.This method returns a boolean value which is −True, when the underlying database supports stored procedures.False, when the underlying database doesn't support stored procedures.To determine whether the underlying database supports stored procedures−Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a ... Read More
You can use $eq as well as $ne operator for boolean values. Let us first create a collection with documents −> db.booleanQueryDemo.insertOne({"UserName":"John", "UserAge":23, "isMarried":true}); { "acknowledged" : true, "insertedId" : ObjectId("5cc815c08f9e6ff3eb0ce44a") } > db.booleanQueryDemo.insertOne({"UserName":"Chris", "UserAge":21, "isMarried":false}); { "acknowledged" : true, "insertedId" : ObjectId("5cc815d08f9e6ff3eb0ce44b") } > db.booleanQueryDemo.insertOne({"UserName":"Robert", "UserAge":24, "isMarried":false}); { "acknowledged" : true, "insertedId" : ObjectId("5cc815dc8f9e6ff3eb0ce44c") } > db.booleanQueryDemo.insertOne({"UserName":"David", "UserAge":26, "isMarried":true}); { "acknowledged" : true, "insertedId" : ObjectId("5cc815ed8f9e6ff3eb0ce44d") }Following is the query to display all documents from a collection with the help of find() method −> db.booleanQueryDemo.find().pretty();This will produce the following output −{ ... Read More