java data type precedence

From low to high: 
byte , Short , char -> int -> Long -> a float -> Double      

• 1. boolean type can not be cast.

• 2. The object types can not convert into unrelated objects classes.

• 3. must be cast at converting a large capacity type of a small capacity type.

• 4. The conversion process may result in overflow or loss of accuracy

• The floating-point to integer conversion is obtained by dropping the decimal, rather than rounded

E.g:

(int)23.7 == 23;         (int)-45.89f == -45