Java Programing laungage

In java there are two type of conversions between numeric types:

1. Widening primitive conversion and
2. Narrowing Primitive conversion

These conversions are applying for integers

1. Widening primitive Conversion:

Widening conversion are very simple. There is no cast required and will never result in a runtime exception. precision may be lost when converting from integer to floating point types.

byte	to	short, int, long, float, or double
short	to	int, long, float, or double
char	to	int, long, float, or double
int	to	long, float, or double
long	to	float or double
float	to	double

Example :

int i = 65;
long l = i;

class WideningConversion 
{
	public static void main(String[] args)
	{
		int i = 123456789;
		float f = i;
		System.out.print(f);
	}
}

Output :

1.23456792E8

2. Narrowing Primitive Conversion:

Cast required between types. Overflow and underflow may happen but a runtime exception will never happen. In case of narrowing conversion from long (64 bit) to int (32) bit we have 32 fewer bits in the destination number. The following integer type conversions are the narrowing ones.

short	to	byte or char
char	to	byte or short
int	to	byte, short, or char
long	to	byte, short, char, or int
float	to	byte, short, char, int, or long
double	to	byte, short, char, int, long, or float

Example :

long l = 656666L;
int i = (int) l;

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