Java

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Tamil Hacks
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Java is easy and fun to learn, so let’s learn java. Are you ready ?!

All the codes shown in the video is available here: 

Java notes :

  • Java is a simple language.
  • Java is easy to learn and its syntax is clear and concise. 
  • It is based on C++ (so it is easier for programmers who know C++).Java is an object-oriented programming language.
  • OOP makes the complete program simpler by dividing it into a number of objects. 

//Basic java program 

package com.tamilhacks; 
import java.util.Scanner; 
public class Main 
{ 
     public static void main(String[] args) 
    { 
         // write your code here
         System.out.println("Tamil hacks") ; 
     } 
}

//primitive data types

byte number = 20 ;  
short number2 = 150; 
int number3 = 1999; 
long number4 = 123456789789L; 
float number5 = 11.5F;
double number6 = 1111.99999999; 
char alphabet = 'b' ; 
boolean bool = false ; 
System.out.println(bool); 
System.out.println(number);

// reference data types 

 int number = 10; 
 //5 = 0 ,1, 2, 3, 4 
 int[] numbers = {10,11,12,13,15}; 
 // numbers[0] = 10; 
 // numbers[1] = 11; 
char name[] = {'a' ,'b' ,'s' ,'a'}; 
int len = name.length; 
char name1[] = name.clone();  
System.out.println(Arrays.toString(name1)); 
System.out.println((name[0])); 
System.out.println(len);

//STRINGS 

String channelName = "tamil Hacks" + " youtube channel"; System.out.println(channelName.endsWith("channels")); 
System.out.println(channelName); 
int numberOne = 1000 ; 
int ageOfPerson = 25 ; 
int numbers[] = { 1, 2, 3,}; 
int numbersOf2Dim[][] = { {1,2 } ,{ 1,3} }; 
byte number = 5; 
number = 10;
System.out.println(number);

//constant 

final int ageOfPerson1 = 18; 
 //ageOfPerson1 = 21;

//operations 

byte number1 = 20; 
 int number2 = 10; 
 int number3 = number2 + number1; 
 number2 *= 10; 
 int number4 = (5 + 5 )- 10 *5 *6 /9 /8 % 20; 
 int number5 = 2 / 2;

//BODMAS //logical opertorss && , || , !! 

 int ageOfPerson = 21; 
 boolean indianCitizen = false; 
 // condition true false
 String name = ageOfPerson >= 18 ? "eligible" : "not eligible";
 int number10 = 10; 
 // -- number10 ; 
 int number11 = ++ number10;
System.out.println(number10);
System.out.println( number11 );

//MATH 

 int number = 100; 
 float number1 = 101.13f; 
 System.out.println(Math.log(number)); 
 String name ; int number1; 
 int number2;

//Scanner

Scanner input = new Scanner(System.in); 
 System.out.println("enter a name :"); 
 name = input.nextLine(); 
 number1 = input.nextInt(); 
 number2 = input.nextInt(); 
 System.out.println("hi ," + name + " " + name.toUpperCase() + " " + name.length());   System.out.println(number1 + number2);

//if conditions 

 int pen = 10; 
 int specialPen = 20; 
 int cost ; 6
 Scanner input = new Scanner(System.in);
 cost = input.nextInt(); 
 if (cost > specialPen) //cost > 20 
 System.out.println("you can buy the special pen");  
 else if (cost > pen) 
{ //cost >10
     System.out.println("you can buy the pen"); 
     System.out.println("you have " + cost); 
} 
 else 
 System.out.println("you have less money to buy the pen");

//switch 

int number = 10; 
 String name ; 
 Scanner input = new Scanner(System.in); 
 name = input.nextLine(); 
 switch (name)
{ 
     case "karthik" :
         System.out.println("hi, "+name); 
         break; 
     case "raj" : 
         System.out.println("hi, "+name); 
         break; 
     case "arun" : 
         System.out.println("hi, "+name); 
         break; 
     case "bharath" : 
         System.out.println("hi, "+name); 
         break; 
     default:
         System.out.println("your name is not in list"); 
}

 //loops 

 //for loop , while , do while , for-each loop 
// 0 < 5 
for ( int initial = 1 ; initial > 0 ; initial -- )
{ 
     System.out.println("hi dude");
}

//while loop 

int number = 3;
while(number > 10)
{ 
    //3>0 //2>0 //1>0 //0>0 
     System.out.println("while loop"); 
     number -- ; 
}

 //do while loop 

int number1 = 3;
 do
{ 
     System.out.println("do while loop"); 
     number1 -- ; 
}
while (number1 > 10);
 //0 , 0<5 , 0+1 =1 , 1<5 , 2<5 , 3<5 , 4<5 , 5<5

//for each – arrays 

 String vegetables[] = {"onion" , "carrot" ,"beans"}; 
 for(int i = vegetables.length-1 ; i > 0 ; i--)
{ 
    System.out.println(vegetables[i]); 
} 
for(String vegetable : vegetables)
{
     System.out.println(vegetable); 
}


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