why does java have different data 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: class as a data type in java

Class Node {

Node next = null;
int data;

public Node(int d){ data = d; }

void append(int d)
    {
        blah blah blah
        ..............
    }
}