Java is
Statically typed language. In Statically typed language, it is necessary to
specify the data type of variables. Data type defines which type of data can be
stored in variables. Operating system reserves memory for variables according
to their data types. Java has different data types for all type of data such as
integer, decimal, character etc.
Java is strongly typed programming language.
Java has two types of data types:
(1) Primitive Data Type
(2) User-Defined Data Type
Primitive Data Types
Primitive data types are predefined data types and each data type
is named by keyword. Java has 8 primitive data types.
boolean
- boolean is keyword in java
- The boolean data types represents one bit of information
- The boolean variables can store either of two values: true and
false
- The boolean variables can be used in decision making statements
- Default value of boolean variable is false
Example:
public class datatypes
{
public static void
main(String[] args)
{
boolean b1;
b1 = true;
System.out.println(b1);
b1 = false;
System.out.println(b1);
}
}
OUTPUT:
true
false
byte
- byte is a keyword in java
- The byte data type is 8-bit signed two’s complement integer
- The byte data type variables can store values between -128 and
127
- The byte variables is used for saving memory in large arrays
- Default value of byte variable is 0
Example:
public class datatypes
{
public static void
main(String[] args)
{
byte b1;
b1 = 127;
System.out.println("b1
= "+b1);
System.out.println("After
increment, b1 = "+(++b1));
}
}
OUTPUT:
b1 = 127
After increment, b1 = -128
short
- short is a keyword in java.
- The short data type variables can store values
between -32768 and 32767
- The short data type is a 16-bit signed two's complement
integer
- Default value of short data type variable is 0
Example:
public class datatypes
{
public static void
main(String[] args)
{
short s;
s = 32767;
System.out.println("s
= "+s);
System.out.println("After
increment, s = "+(++s));
}
}
OUTPUT:
s = 32767
After increment, s = -32768
int
- int is a keyword in java
- The int data type is 32-bit signed two's complement integer
- The int data type variables can store values between -
2,147,483,648 (-2^31) and 2,147,483,647 (2^31 -1)
- Default value of int type variable is 0
Example:
public class datatypes
{
public static void
main(String[] args)
{
int i;
i =
2147483647 ;
System.out.println("i
= "+i);
System.out.println("After
increment, i = "+(++i));
}
}
OUTPUT:
i = 2147483647
After increment, i = -2147483648
long
- long is a keyword is java
- The long data type is 64-bit signed two's complement
integer
- The long data type variables can store values between -263
and 263-1
- Default value of long data type is 0.
Example:
public class datatypes
{
public static void
main(String[] args)
{
long l;
l =
9223372036854775807L;
System.out.println("l
= "+l);
System.out.println("After
increment, l = "+(++l));
}
}
OUTPUT:
l = 9223372036854775807
After increment, l = -9223372036854775808
float
- float is a keyword in java
- The float data type is a single-precision 32-bit floating
point
- The float type is used for saving memory in large arrays for
storing floating values
- Default value of float type is 0.0f
Example:
public class datatypes
{
public static void
main(String[] args)
{
float f;
f =
-78.97f;
System.out.println("f
= "+f);
}
}
OUTPUT:
f = -78.97
double
- double is a keyword in java
- The double data type is a double-precision 64-bit floating
point
- Default value of double data type is 0.0d
Example:
public class datatypes
{
public static void
main(String[] args)
{
double d;
d =
-778.07d;
System.out.println("d
= "+d);
}
}
OUTPUT:
d = -778.07
char
- char is a keyword in java
- The char data type is 16-bit Unicode character
- Minimum and maximum value of char data type is '\u0000' (0)
and '\uffff'
- Default value of char data type is '\u0000'
Example:
public class datatypes
{
public static void
main(String[] args)
{
char c;
c =
'B';
System.out.println("c
= "+c);
}
}
OUTPUT:
c = B
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