Data types

different types of data types used in java

1. Presentation on data types By- neha jhala

2. Data types A data type is used to declare a variable. Every variable should be declared before initialization.

3. There are two types of data types Primitive data type Non Primitive data type Boolean Byte Char Short Int Long Float Double String Array Class

4. Primitive data type Byte -(Size is 2 byte) *Its integer with small range *Byte data type is an 8-bit signed two's complement integer. *Minimum value is -128 (-2^7) *Maximum value is 127 (inclusive)(2^7 -1) * Default value is 0 * Byte data type is used to save space in large arrays, mainly in place of integers, since a byte is four times smaller than an integer.

5. Primitive data type Boolean -(T/F)(size is 1 byte) Its true or false .by default its false boolean data type represents one bit of information There are only two possible values: true and false

6. Primitive data type Char – (size is 2 byte) char data type is a single 16-bit Unicode character Minimum value is 0 Maximum value is 65,535 Char data type is used to store any character from keyboard(0-9,A-Z,a-z) Example: char letterA = 'A‘

7. Primitive data type Short -(size is 2 bytes) Its also integer type Short data type is a 16-bit signed two's complement integer Minimum value is -32,768 (-2^15) Maximum value is 32,767 (inclusive) (2^15 -1) Short data type can also be used to save memory as byte data type. A short is 2 times smaller than an integer Default value is 0. Example: short s = 10000, short r = -20000

8. Primitive data type Int - (size is 4 bytes) Its also integer data type with bigger size. Int data type is a 32-bit signed two's complement integer. Minimum value is - 2,147,483,648 (-2^31) Maximum value is 2,147,483,647(inclusive) (2^31 -1) Integer is generally used as the default data type for integral values unless there is a concern about memory. The default value is 0 Example: int a = 100000, int b = -200000

9. Primitive data types Long - (size is 8 bytes) Its also integer data type with more size Long data type is a 64-bit signed two's complement integer Minimum value is -9,223,372,036,854,775,808(-2^63) Maximum value is 9,223,372,036,854,775,807 (inclusive)(2^63 -1) This type is used when a wider range than int is needed Default value is 0L Example: long a = 100000L, long b = -200000L

10. Primitive data types Float -(size is 4 bytes) Used for decimal values Float is mainly used to save memory in large arrays of floating point numbers Default value is 0.0f Float data type is never used for precise values such as currency Example: float f1 = 234.5f

11. Primitive data types Double- (size is 8 bytes) - double data type is a double-precision 64-bit - This data type is generally used as the default data type for decimal values, generally the default choice. - Double data type should never be used for precise values such as currency. - Default value is 0.0d - Example: double d1 = 123.4

12. Float and double In computer science, the precision is usually measured in bits, but sometimes in decimal digits. i.e no of digits after decimal point Float and double are two of the data types used to represent decimal values or floating point literals in the Java programming language. Float is basically single precision and it can represent decimal values up to 7 digits of precision double can represent decimal values up to 16 digits of precision. Single Precision is a 32-bit type; Double Precision is a 64-bit type. Accordingly, Doubles store a much broader range of values, and with much more precision .

13. Float and double For example If 10/3 is 3.3333333 ..its single precision But if its 3.33333333333333..its double precision By default java takes double precision.

14. Non primitive data types String In Java , string is basically an object that represents sequence of char values. An array of characters works same as Java string . For example : char[] ch ={'j','a','v','a','t','p','o',' i ',' n','t '}; a string is used to represent text rather than numbers. ... For example , the word “java" and the phrase “I study java" are both strings . “34567" can be defined as string if defined properly. The length of a string is determined by a termination null character.”\0”. So a string (“java”) has five characters. ‘ j’,’a’,’v’,’a ’. And null character ‘\0’.

15. array An array is a container object that holds fixed number of values of a single type. Length of an array is decided when array is created.after creation its length is fixed.

16. class A class can be defined as a template/blueprint that describes the behavior/state that the object of its type support. Public class dog { String breed; Int age; String color;