Primitive Data Types

Primitive Data Types:

There are total eight primitive data types in java.

1. boolean
2. byte
3. char
4. short
5. int
6. long
7. float
8. double

All the 8 data types can be considered as  building blocks of data manipulation.

Java Package: - A package is a  way to organize your java projects.

for all primitive data type we have corresponding class is known as Wrapper class.

Integer is a Wrapper class .

Overflow and Underflow in Java:
       If you try to put a value larger than the maximum value in java or, a value smaller than  the minimum value in java , than you will get Overflow in the case of maximum vale or Underflow in the case of minimum.

What Happens in background during  Overflow or, Underflow in Java:
    The computer just skips back to the minimum number or the maximum  number , which is not usually not what you want . it's an important concept to be aware of.


Program:



public class PrimitiveDataType {

public static void main(String[] args) {

int myValue = 100;
int minIntValue = Integer.MIN_VALUE;
int maxIntValue = Integer.MAX_VALUE;
System.out.println("Ingeger min value = " + minIntValue);
System.out.println("Integer max value = " + maxIntValue);

//add +1 to max value  and -1 to min value
System.out.println("Add 1 to max value = "+maxIntValue+1); //overflow will happen
System.out.println("subs 1 to min value = "+minIntValue-1);// unnderflow will happen

int maxintvalue=2147483648;// will get compile time error  saying that The literal 2147483648 of type int is out of range

int maxvalue=2_147_483_647;// will not give any error
}
}

 
byte Data type:-

program:


public class byteDataType {
public static void main(String[] args) {

byte minByteval = Byte.MIN_VALUE;
byte maxByteVal = Byte.MAX_VALUE;

System.out.println("Byte min value = " + minByteval);
System.out.println("Byte max value = " + maxByteVal);
}
}

short data type:

program:

public class shortDatType {

public static void main(String[] args) {

short minShortval = Short.MIN_VALUE;

short maxShortval = Short.MAX_VALUE;

System.out.println("Min short value =" + minShortval);

System.out.println("Max short value =" + maxShortval);

}

}

Size of primitive Types and width:

A Byte occupies 8 bits. A bit is not directly represented in a primitive type - we have a boolean which is not really the same thing .

 Hence a Byte occupies  8 bit . we can say that a byte has a width of 8.

A short  can store a large range of number and occupies 16 bits, and  has width of  16.

An int has a much larger range as we know, and occupies 32 bits and has a width of 32.

NOTE:  Each primitive  type  occupies different amount of memory - we can see that an int needs four times the amount of space, than a byte .

long Data type: