types of numbers in java code example

Example 1: primitive data types in java

/* 
	Java Data Types
There 2 Types Of Data Types In Java
1) Primitive -> byte, char, short, int, long, float, double and boolean.
2) Non-primitive -> (All Classes) -> String, Arrays etc.

Type	Size	Stores
byte	1 byte	whole numbers from -128 to 127
short	2 bytes	"" -32,768 to 32,767
int	    4 bytes	"" -2,147,483,648 to 2,147,483,647
long	8 bytes	""-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float	4 bytes	fractional numbers; for storing 6 to 7 decimal digits
double	8 bytes	fractional numbers; "" 15 ""
boolean	1 bit	true or false values
char	2 bytes	single character/letter or ASCII values
*/

Example 2: how to have a only number type in java

class scratch{
    public static Number haha(Number yo){
        return yo;
    }

    public static void main(String[] args) {
        System.out.println(haha( (int) 5 ));
        System.out.println(haha( (double) 5.0 ));
        System.out.println(haha( (long) 5 ));
        System.out.println(haha( (float) 5.0 ));
        //all of these classes extend the java.lang.Number class 

        System.out.println(haha("Hey"));
        //error because the java.lang.String class does not extend the java.lang.Number class
    }
}