#6 Data types in Java

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In this lecture we are discussing
1) datatypes for given variable
a)Types of data-types?
b)primitive data types
c)why do we need different type of integer type?
d)how to create variable of different data types?

2) range and way to declare different data variable

#1
a) Datatypes are categories into primitive and non-primitive datatype.
But in this lecture, we are take all concept upon primitive data type.

b) There are 8 primitive datatype
integer ---byte, short, int, long
float --- float , double
character ---char
boolean --- boolean

c) why do we need different type of integer ?
= there are range for each type. for int --4 bytes ,long --8 bytes, short --2bytes byte --1byte

d) How to create variable of different data type?
= int a=10; byte b=4
= dataType variableName = value;

integer variable declaration
int a=5;
long b=600l; // e.g 578l, 100000l represent long integer type
byte c=127;
short s=128;

float vs double
=double have more precision than float by default java support double.
=declare variable of float and double type
--double a=5.6;
--but float b=5.6; //give error
--correct way float b=5.6f;

character representation
= char ch='a'; //using single quotes on character we can declare char type of variable

boolean representation of variable
= boolean result=true; there are only two value of boolean either true or false.
=In other language like c and c++ -- 0 is treated as false and non zero number treated as true but it is not in java.

{byte, short, int, long, float, double, char, Boolean }
since java is statically type or say strongly type language therefore we need
to mention datatype for each variable for declaring variable.
e.g int i=5; float f=2.5f;

In java integer are by default for integer int type;
for real number by default double

#2
Range and way to declare different data type variable
int i=5;// 4 bytes ---32 bytes -- -2147483648 to 2147483647
short s=5;//2 bytes -- 16 bytes -- -32768 to 32767
byte b=5;//1 byte -- 8 bytes -- -128 to 127
long l=5;//8 bytes -- 64 bytes -- -9223372036854775808 to 9223372036854775807
float f=5.5f;//4 bytes -- 32 bytes -- 1.4e-45 to 3.4028235e+38
double d=5.5;//8 bytes -- 64 bytes -- 4.9e-324 to 1.7976931348623157e+308
char c='a';//2 bytes -- 16 bytes -- 0 to 65535
boolean check=true; //value is either true or false
ASCII - American Standard Code for Information Interchange

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[RaunakKumar-vcji]

sir where were a diamond in search of gold♥

[ashishtayade]

Thank you sir very nice gide & very nice best java in data type teaching information video..👍

[Flo-mzct]

Thanks a lot! I will watch whole series to refresh my java skills :D

[zikki]

thank you so much sir...superb explanation..

[devanshusachdev]

Whoa! so much information in such a small video. Here are the points which I liked the most:

1. Real values are treated as double by default. We have to explicitly specify float value.
(Ex.: double d = 5.6 --> no error ; float f = 5.6 --> error)

2. Only 'true' and 'false' are treated as boolean.
(Ex.: if(true) --> no error ; if(1) --> error)


Thanks Navin for the info :)

[qvlhbsh]

Thanks, great explanation in detail and in a simple way to understand

[gdinpgo]

May you please make a video series on making a 3d Game Engine with Java
Please update when you do

[theamritjha]

Sir ek baar main hi sare video daal diye aapne 😅

[SP-unrj]

Thank you sir Please Try To upload Servlet, JSP And Spring Videos Also In 2023

[abinayas]

when ur printing input output is not print syout how u get output

[arthdaware]

Keypoints:

1. default: double (8bytes) not float
2. char datatype: only one character and single quotes are allowed
3. write f at the end of float, l at the end of long
4. byte range: [-128, 127]

[deepanshusahu]

Sir i have one question if u all the content of topic is covered in such a small times

[Magicpeach]

Im getting error constantly says
Could not find pr load main class Hello
Class not found what should i do??

[HarshPatel-sogl]

why can you put only one character/letter/number in the char variable?

[siddamallayyahiremath]

i am searching for advanced java can u help me??

[martinamillo]

I wrote this code and cant get what is wrong with it

class Hello
{
public static void main(String a[])
{
Char c = ‘k’;
System.out.print(c);
}
}

when i compile it, it shows these errors
Hello.java:5: error: illegal character: '\u00b4'
Char c = ┬┤k┬┤;
^
Hello.java:5: error: illegal character: '\u00b4'
Char c = ┬┤k┬┤;
^
Hello.java:5: error: not a statement
Char c = ┬┤k┬┤;
^
3 errors

How to resolve?

[kittu]

what you are typing to compile in terminal . i'm not getting you there

[sreesanth]

class Hello

{
public static void main(String a[])
{
System.out.println(3 + 5);
}

}
for this code i get this "Hello world"