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It’s been now 42 years when Steve Jobs, Steve Wozniak, and Ronald Wayne founded Apple Inc with a promise to keep revolutionizing lives and they have kept their promise too brilliantly until now. This is why they have done what other companies only wish to achieve. Congratulations Apple for setting another benchmark and bringing a significant change to the society through cutting-edge tech inventions.However, it was never easy. Check out the story of infinite passion, nerve-wracking struggle, and the never yielding self-will.Many people believe that Apple was founded only by Steve. Well, the reality is here. Apple was founded by ... Read More
A class can be made final by using the final keyword. The final class cannot be inherited and so the final keyword is commonly used with a class to prevent inheritance.A program that demonstrates a final class in Java is given as follows:Example Live Demofinal class A { private int a = 15; public void printA() { System.out.println("Value of a = " + a); } } public class Demo { public static void main(String args[]) { A obj = new A(); obj.printA(); } }OutputValue of a = ... Read More
We are using MySQL version 8.0.12. Let us first check the MySQL version:mysql> select version(); +-----------+ | version() | +-----------+ | 8.0.12 | +-----------+ 1 row in set (0.00 sec)To deal with Boolean in MySQL, you can use BOOL or BOOLEAN or TINYINT(1). If you use BOOL or BOOLEAN, then MySQL internally converts it into TINYINT(1).In BOOL or BOOLEAN data type, if you use true literal then MySQL represents it as 1 and false literal as 0 like in PHP/ C/ C++ language.To proof that MySQL convert the BOOL or BOOLEAN to TINYINT(1), let us create a table with ... Read More
Create a TreeSet and add elements −TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet");Now, let us copy it to object array −Object[] arr = tSet.toArray(); for (Object ob: arr) { System.out.println(ob); }The following is an example to copy all elements in TreeSet to an Object Array −Example Live Demoimport java.util.*; public class Demo { public static void main(String args[]){ TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet"); System.out.println("TreeSet elements = "+tSet); ... Read More
To display the value of a variable, you can use select statement. The syntax is follows −SELECT @yourVariableName;Let us first create a variable. This can be done using SET command. The following is the syntax to create a variable −SET @yourVariableName = yourValue;Let us check the above syntax to create a variable and display the value of created variable.The following is the query to create a variable −mysql> set @FirstName = 'Bob'; Query OK, 0 rows affected (0.04 sec)Now you can display the value of a variable using select statement. The query is as follows −mysql> select @FirstName;The following is ... Read More
This example demonstrates how to check email Address Validation in Android on edit Text.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 edit text and button. When the user clicks on a button, it will check edit text data and validate that data.Step 3 − Add the following code to src/MainActivity.javapackage com.example.andy.myapplication; import android.content.res.Configuration; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import ... Read More
A class is an abstract class if it contains at least one abstract method. It can contain other non-abstract methods as well. A class can be declared as abstract by using the abstract keyword. Also, an abstract class cannot be instantiated.A program that demonstrates an abstract class in Java is given as follows:Example Live Demoabstract class Animal { abstract void sound(); } class Cat extends Animal { void sound() { System.out.println("Cat Meows"); } } class Dog extends Animal { void sound() { System.out.println("Dog Barks"); } } class Cow extends Animal ... Read More
To get the last value in TreeSet, use the last() method.First, get the TreeSet and add elements to it −TreeSet tSet = new TreeSet(); tSet.add("10"); tSet.add("20"); tSet.add("30"); tSet.add("40"); tSet.add("50"); tSet.add("60");Now, get the first value −tSet.last()The following is an example to get the last value in TreeSet −Example Live Demoimport java.util.*; public class Demo { public static void main(String args[]){ TreeSet tSet = new TreeSet(); tSet.add("10"); tSet.add("20"); tSet.add("30"); ... Read More
An interface can be defined using the interface keyword. It contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. An interface is primarily used to implement abstraction and it cannot be instantiated.A program that demonstrates an interface in Java is given as follows:Example Live Demointerface AnimalSound { abstract void sound(); } class CatSound implements AnimalSound { public void sound() { System.out.println("Cat Sound: Meow"); } } class DogSound implements AnimalSound { public void sound() { System.out.println("Dog Sound: Bark"); } } ... Read More
You need to use VALUES() with comma separation for multiple insert or batch insert at a time. Use the following syntax that does not produce an invalid MySQL query on insert. The syntax is as follows:INSERT INTO yourTableName VALUES(yourValue1), (yourValue1), (yourValue2), (yourValue3), (yourValue4), (yourValue5), .......N;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table addMultipleValues -> ( -> Counter int NOT NULL -> ); Query OK, 0 rows affected (0.60 sec)Now you can insert batch records in the table using VALUES() with comma separation. The query ... Read More