java integer types code example

Example 1: what is primitive data type in java

Primitive types are the most basic data types available within the Java language. There are 8: boolean , byte , char , short , int , long , float and double . These types serve as the building blocks of data manipulation in Java. Such types serve only one purpose — containing pure, simple values of a kind.

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
    }
}