Integers:
It includes whole valued signed numbers which are as follow.
Byte- Whose width is 8 and it ranges from -128 to 127. It is the smallest integer type. It is useful when user is dealing with stream or flowing data from a network or a file.
Declaration of two byte variables called x and y is as follow
Byte x, y;
Short- The width of this type of integer is 16 and it ranges from -32,768 to 32,767. It is the least commonly used data type in java.
Declaration:
Short a;
Short b;
Short b;
Int- The width of this type of integer is 32 and it ranges from -2,147,483,648 to 2,147,483,647. It is more efficient as compared to byte and short. It is commonly used to control loops and indexed arrays.
Declaration:
Int a;
Long- The width of this type of integer is 64 and it ranges from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. This is used for those values which are large enough that the integer cannot handle them.
Declaration:Int light speed;
Long days;
Long second;
Seconds = days *24 *60*60;
Floating point type:
This is for real numbers used for calculation such as square roots, sine and cosine. These are of two types.
Float- Width in bits is 32 and range is from 1.4e-045 to 3.4e + 038. Float is used as a variable type for the fractional component, but specifies single precision. It can be used in representing dollars and cents.
Declaration:
Float hightemp;
Double- Width in bits is 64 and range is from 4.9e-324 to 1.8e + 308.it is used and is optimized in such a way that I can be used for high speed mathematic calculation. It has double precision which is faster than the single precision. Function such as sin()and sqrt() etc, return double values.
Declaration:
Double pi, r, a;r = 10.4;
pi = 3.14;
a = pi* r * r;
Characters:
- The data type used store or declare character in java is char.
- It is 16-bit type in java. Range of a char is 0 to 65,536.
- There are no chars which are negative in nature.
Class charExample
{
Public static void main (String args []) {
Char a, b;
a=88;
b=’y’;
system.out.print (“a and b: “);
system.out.println (a + “ “ +b);
}
}
Booleans:
- It is a primitive type for logical values.
- This tends have only one of two possible values, true or false.
- It is governed by if or for control state
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