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Data Types In Java

2. INDEX
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Introduction to
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What is data type in Java?
Data types with examples
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4. What is data type?
In computer programming, a data type is an attribute of data which
indicates the compiler or interpreter how the programmer expects
to use the data.
There are three types:
1. Primitive types  byte, short, int, long, float, double, char
2. Derived types  Arrays
3. User-defined types  class, sub class, abstract class, interface,
enumeration and annotation.

5. Primitive Data Types
Primitive data types
Numeric Types Non-Numeric Types
Integer Types
(Whole numbers)
Floating Point Types
(Decimal numbers)
• Byte – 8 bit
• short – 16 bit
• int – 32 bit
• long – 64 bit
• float – 32 bit
• double – 64 bit
Char
8bit
Boolean
True - or- false

6. Numeric Types
The numeric types has divided into two types.
Integer types: Positive, negative, Whole numbers and without decimal
Floating point types: With decimal, numbers with fractional part

7. Integer Types
Byte: The byte is an 8-bit signed two's complement integer. It has a minimum
value of -128 and a maximum value of 127.
For Example:
byte myNum = 120;
System.out.println(myNum);
Short: It can store whole numbers from -32768 to 32767.
For Example:
short myNum = 5002;
System.out.println(myNum);

8. Integer Types
int: It can store whole numbers from -2147483648 to 2147483647.
For Example:
int myNum = 200000;
System.out.println(myNum);
long: The long data type can store whole numbers from -9223372036854775
808 to 9223372036854775808.
For Example:
long myNum = 20000000000L;
System.out.println(myNum);

9. Floating Point Types
float: It can store fractional numbers from 3.4e−038 to 3.4e+038. Should end
with “f”.
For Example:
float myNum = 3.75f;
System.out.println(myNum);
Double: The double data type can store fractional numbers from 1.7e−308 to
1.7e+038. Should end with “d”.
For Example:
double myNum = 17.99d;
System.out.println(myNum);

10. Non Primitive DataTypes
Booleans: A Boolean data type is declared with the boolean keyword. It only t
akes the values true or false.
For Example:
boolean iscat = true;
boolean isFish = false;
System.out.println(iscat);
System.out.println(isFishTasty);

11. Non Primitive Data Types
char: It is used to store a single character. A char value must be enclosed by
single quotes, like 'A' or 'B'.
For Example:
char myGrade = 'C';
System.out.println(myGrade);

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Hope useful!