Oracle OCA j2se7 cetificate-rules for Primitive Types

• Any bigger than an int can never is assigned to a int or anything smaller than int (byte, char, or short ) without explicit cast.

• Constant values up to int can is assigned (without cast) to variables of lesser size (e.g. short to byte) if the values AR e representable by the variable.

• Operands of mathematical operators is always promoted to at LEAST Int. (e.g. Byte*byte both bytes would be first promoted to int) and the return value is at LEAST Int.

• Compound Assignment operators (+ =, *= etc) has strange ways so ready this carefully:a Compound assignment expression of The form E1 op = E2 is equivalent to E1 = (T) ((E1) op (E2)), where T is the type of E1

• A char value can always be assigned to an int variable, since the int type is wider than the char type.

• A narrowing primitive conversion May is used if all of the following conditions is satisfied:

1. 1. The expression is a constant expression of type int.

   2. The type of the variable is a byte, short or char.

   3. The value of expression is representable in the type of the variable.

   4. NOTE that narrowing conversion doesn ' t apply to long or double. So, char ch = 30L; Would fail Althrough representable by a char.

Oracle OCA j2se7 cetificate-rules for Primitive Types