Data Types & Variable in java Lecture 2 #learnjava #learntechwithsmriti

Notes that Learn in this video :

public class lecture2 {
public static void main(String [] args)
{
// this is a single line comment.

System.out.println("learn single line comment");

/*this
* is a multi line comment.
* this is not consider by compiler.
* // variable in java
*/
// variable is a container for storing data values.
/*
* int = 1,2 ,30,1000 etc
* float = 0.3,3.4,5.6 etc
* String = "Learn" , "this is a string "
* boolean =true / false
* char ='A','b','x' etc
*/
// int var=5;
//System.out.println(var);


//String sl="learn tech ";
// String s2="with smriti";
//System.out.println(s1+s2); learn tech with smriti


// Data types in java

/* byte ,short , int ,float , long, double, boolean, char

byte 1 byte -128 --- 127;
short 2 byte -32768 -- 32767;
int 4 byte -2147483648 --- 2147483647
long 8 byte -9223372036854755808 -- 9223372036854755807
float 4 byte 6 to 7 decimal number
double 8 byte 15 decimal digit
boolean 1 bit either true or false
char 2 byte 'A','B','C'

*/
String name = "John";
System.out.println(name);

int myNum = 15;
System.out.println(myNum);

myNum = 20; // myNum is now 20
System.out.println(myNum);

int myNum2;
myNum2 = 15;
System.out.println(myNum2);


double myFloatNum = 5.99;
char myLetter = 'D';
boolean myBool = true;
String myText = "Hello this is a string ";
System.out.println(myFloatNum);
System.out.println(myBool);
System.out.println(myLetter);
System.out.println(myText);

final int myNumfinal = 15;
// myNumfinal=30;
System.out.println(myNumfinal);

}

}