DEV Community: Pavitra Aravind

else if flow chart

Pavitra Aravind — Tue, 28 Jan 2025 06:38:52 +0000

Nested if

Pavitra Aravind — Tue, 28 Jan 2025 06:35:19 +0000

Java If Else Statement

In Java, if statement is used for testing the conditions. The condition matches the statement it returns true else it returns false. There are four types of If statement they are:

For example, if we want to create a program to test positive integers then we have to test the integer whether it is greater that zero or not.

In this scenario, if statement is helpful.

There are four types of if statement in Java:

if statement
if-else statement
if-else-if ladder
nested if statement

if Statement

The if statement is a single conditional based statement that executes only if the provided condition is true.

If Statement Syntax:

if(condition)
{

//code
}

We can understand flow of if statement by using the below diagram. It shows that code written inside the if will execute only if the condition is true.

if-else Statement

The if-else statement is used for testing condition. If the condition is true, if block executes otherwise else block executes.

It is useful in the scenario when we want to perform some operation based on the false result.

The else block execute only when condition is false.

Syntax:

if(condition)
{

//code for true

}
else
{

//code for false

}

if else Example:

In this example, we are testing student marks, if marks is greater than 65 then if block executes otherwise else block executes.

public class IfElseDemo1 {

public static void main(String[] args)
{

int marks=50;

if(marks > 65)
{

System.out.print("First division");

}

else
{

System.out.print("Second division");

}
}

}

if-else-if ladder Statement

In Java, the if-else-if ladder statement is used for testing conditions. It is used for testing one condition from multiple statements.

When we have multiple conditions to execute then it is recommend to use if-else-if ladder.

Syntax:

if(condition1)
{

//code for if condition1 is true

}
else if(condition2)
{

//code for if condition2 is true

}

else if(condition3)
{

//code for if condition3 is true

}

...

else
{

//code for all the false conditions

}

Nested if statement

In Java, the Nested if statement is a if inside another if. In this, one if block is created inside another if block when the outer block is true then only the inner block is executed.

Syntax:

if(condition)
{

//statement
if(condition)
{

//statement
}

}

HTML

Pavitra Aravind — Mon, 20 Jan 2025 16:06:29 +0000

What is HTML?
*HTML is a language for describing we pages.
*HTML stands for hyper text markup languages.
*HTML is a markup languages.
*A markup language is a set of markup tags.
*The tags describe document content.
*HTML documents contain HTML tags and plain text.
*HTML documents are also called web pages.

1st day JavaScript class

Pavitra Aravind — Mon, 20 Jan 2025 15:37:26 +0000

1.What is JavaScript?

*JavaScript is the Programming Language for the Web. JavaScript can update and change both HTML and CSS. JavaScript can calculate, manipulate and validate data. JavaScript is easy to learn. This tutorial will teach you JavaScript from basic to advanced.

*JavaScript is a versatile, dynamically typed programming language used for interactive web applications, supporting both client-side and server-side development, and integrating seamlessly with HTML, CSS, and a rich standard library.

*JavaScript is a single-threaded language that executes one task at a time.
*It is an Interpreted language which means it executes the code line by line.

2.How does it works?

 JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else.

Sample program using Encapsulation

Pavitra Aravind — Thu, 19 Dec 2024 05:19:24 +0000

Input:

class Bank
{
String name;
int loan;
private int interest;

public Bank(String name, int loan, int interest)
{
this.name = name;
this.loan = loan;
this.interest = interest;
}
public static void main(String[] args)
{
Bank SBI = new Bank("Aravind",1000,5);
SBI.receive();

}

private void receive()
{
System.out.println(interest);
}

}

Input:

class Bank2
{
public static void main(String[] args)
{
Bank canara = new Bank("Dev",5000,2);
canara.receive();
}
}

Output:

Encapsulation

Pavitra Aravind — Wed, 18 Dec 2024 10:52:36 +0000

Input:

Output:

Today Task

Pavitra Aravind — Tue, 17 Dec 2024 08:48:19 +0000

Task:

Create a class Called PlayGround
Create non-static variables as below. int score, balls, catches; String player_name;
Create main method.
Inside main method, create two instances as below. PlayGround player1 = new PlayGround("dhoni", 100, 3); PlayGround player2 = new PlayGround("jadeja", 56, 2, 30);
Create appropriate constructors for handling above objects.
Using player1 object, call batting() method. Print - score, player_name.
Using player2 object, call allrounder() method. Print - score, player_name, balls, catches

Input:

class PlayGround
{

int score, balls, catches;
String player_name;

public PlayGround(String player_name, int score, int catches)
{
this.player_name = player_name;
this.score = score;
this.catches=catches;
}

public PlayGround(String player_name, int score, int catches, int balls)
{
this.player_name = player_name;
this.score = score;
this.catches = catches;
this.balls = balls;
}

public static void main(String[] args)
{
PlayGround player1 = new PlayGround("dhoni",100,3);
PlayGround player2 = new PlayGround("jadeja",56,2,30);

player1.batting();
player2.allrounder();

}

public void batting()
{
System.out.println(player_name + " "+ score);
}

public void allrounder()
{
System.out.println(player_name + " "+ score + " " + balls + " "+ catches + " ");
}
}

Output:

Today Test

Pavitra Aravind — Mon, 16 Dec 2024 13:18:29 +0000

Test:

Create a class 'Employee'
Have main method in it.
Inside main method, create an object.
Using this object, call method called 'develop'.
using this object, call method called 'work(10)'
Define appropriate methods develop() and work(int no)
From work method, return no * 10
Store the returned value as 'output' in main method.
Print the 'output'.

Input:

Output:

What is static and Non static method in java?

Pavitra Aravind — Sat, 14 Dec 2024 11:18:26 +0000

Static variable is like a global variable and is available to all methods.
static variable will have only one memory copy.
Non static variable is like a local variable and they can be accessed through only instance of a class.
Non staic variables will have mutiple copies in memory.

Today task

Pavitra Aravind — Sat, 14 Dec 2024 08:35:52 +0000

Create a class called Cricket
Create static variable int overs = 20;
Create non-static variable int score;
Have main method in it.
Inside main method, create two instances dhoni, kohli.
For dhoni, assign score as 50; dhoni.score = 50;
For kohli, assign score as 60;
Create a method (outside main method) as below. public void display() { System.out.println(score); System.out.println(overs); }
Now, using object dhoni call display() method. dhoni.display()
Using instance kohli, call display() method. kohli.display()

Input:

class cricket
{
static int overs = 20;
int score;

public static void main(String[] args)
{
cricket dhoni = new cricket();
dhoni.score = 50;

cricket kohli = new cricket();
kohli.score = 60;

kohli.display();

}
public void display()
{
System.out.println("kohli"+ score);
System.out.println("kohli"+ overs);
}

}

output:

Today class

Pavitra Aravind — Sat, 14 Dec 2024 07:50:35 +0000

class Movies
{
static String language = "Tamil";
static boolean new_movie = true;
String hero, heroine, comedian, director, villain, music_director;
int no_of_days;
static int ticket_price;
boolean hit;

public static void main(String[] args)
{
Movies amaran = new Movies();
amaran.hero = "sivakarthikeyan";
amaran.heroine = "sai pallavi";
amaran.music_director = "gvprakash";
amaran.ticket_price = 110;
amaran.no_of_days = 50;
amaran.hit = true;
System.out.println(amaran.hero);
System.out.println(amaran.director);
System.out.println(amaran.comedian);
System.out.println(amaran.villain);

Movies leo = new Movies();
leo.hero = "vijay";
leo.heroine = "trisha";
leo.director = "lokesh";
leo.music_director = "anirudh";
leo.villain = "arjun";
leo.hit = false;
System.out.println(leo.hero);
System.out.println(leo.hit);
System.out.println(leo.no_of_days);

amaran.watch();

}
public void watch()
{
System.out.println("Inside watch() method " + hero);
}

}

Output:

Today Task 3

Pavitra Aravind — Fri, 13 Dec 2024 08:28:20 +0000

Task 3:

Create a class called WaterBottle
Have below method in it. public void drink() { System.out.println("Drinking Water"); }
Save and Compile this class.
Create another class called Boy with main method.
Inside main method, create an instance for WaterBottle class.
Using created instance, call drink() method.

Input:

Output: