Java Essentials - Datatypes in java

In this video we are discussing data types in Java

So data types in Java can mainly get divided into two categories

One is the primitive data type and the one is the non-primitive data type

So variables can have different types or data types. And they can store integer type of data, real values or say some character type of data, etc

And the types of data which can be stored in a variable is known as the data types

depending upon the data type how much memory space will get occupied against that

the variable that will be decided and what kind of value the variable can hold that

will be also decided data types can be divided into mainly two major parts one is

the primitive data types these data types are predefined Java compiler knows

them so it is a primitive data type because Java knows this type kind of

data types there so we can use any of them when we

we want to use them in our Java code. Non-primitive data types

So in case of non data types these data types are user User can define those data types and programmers can create non data types or abstract data types as when required in our code

And it is also known as abstract data type or ADT. So here we are having one representation that how this data types has got categorized

We are having this primitive data type, that means the Java compiler knows the type of the type of this

data it is pre-known to Java so in case of numeric we're having two categories

one is the integer another one is the floating point in case of floating point there are two categories that they're double and here we're having this

float so double is 64-bit and float is 32 bit that means four bytes for

float and then eight bytes for double under this integer we can have this byte

we can have short I and T long so these are falling under the

numeric data types if you come for the non-numeric data types you can have the

characters we can have the bullion data type so under this user defined data types that is the

ad t non data types so we having categories like our strings we having this arrays you can have the user defined classes so in this way we are having this non data types that is string is one of the non data types it is it is there is

defined with the help of the string class we're having this arrays we can have the user defined

classes also to be used as non-primitive data types so let us go forward here is the list of different

data types and their respective sizes so integer which will be known as INT in our Java code will be using INT all in the lowercase

letters so default value will be zero and it is having a size of 4 bytes in case of

byte it will be written as byte and default value is zero and it will be occupying one

byte of information in the memory that is the 8 bits we're having this long written as long

the default value is 0 and it will be occupying 8 bytes there we're having this short

in our Java code will be writing this short having the value zero and it is having

two bytes of allocation in the memory we're having this a float 0.0 is the

default value and there 4 bytes we having this double in our Java code will be writing this double all in the lower class letters 0 is the different value and 8 bytes is the size or the storage

getting occupied against one double type of variable we're having this character in our Java code

will be writing this one as care and it will be having this slash u 000 000 is the default

value here so it can be occupying it can be holding the asp code values or say it can have the

the representation is in a Unicode format and then we're having the size of that is

the two bytes here we're having this bullion in our Java code we'll be

writing this one as bullion all in the lowercase letters and default values false

and it will be occupying one byte in the computer's memory so in this way we

have defined that what are the different data types are available and all these data types whatever you have defined here we have discussed here in this

respective slide are all primitive data types so Java data types can be divided into two categories one is the primitive data types which is

pre-known to Java and the one is the non-primitive data types where you can have the

classes use the different classes we can have the errors there and that is known as

the non-primitive data type thanks for watching this video