Learn Java Programming - Primitive Numeric Type Conversions Tutorial
This tutorial will focus on what happens when we assign the values of variables of different data types to each other. In order to simply assign the value of a variable of one data type to the variable of another data type the receiving variable needs to be compatible. To be compatible, generally the variable to the left of the assignment operator (=) must be the same size or larger than the variable on the right. The char, float, and double data type variables do not adhere to this generalization though.
The following code will detail the process of what is technically called widening primitive conversions. There are 19 valid conversions as you will see in the source code. My tutorial on Primitive Numeric Type Casting will discuss how you can assign values to incompatible data types.