This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
1. that the compiler performs an implicit conversion for assignments when an expression is a constant expression of type byte, short, char or int; the type of the variable is type byte, short or char; and the value of the expression is within range.
2. it is legal to access a static variable through a reference to an instance of the class
I don't understand why this doesn't compile:
I'm getting the following compiler error:
CompileTimeConstantTest.java:8: possible loss of precision found : int required: byte byte b = ctc.x + ctc.y;
However, everything compiles and runs as expected if I change the line of code which declares the variable b to read:
byte b = x + y;
Thank you guys very much in advance for your help!
This is the definition of a compile-time constant from the Java Language Specification 15.28.
A compile-time constant expression is an expression denoting a value of primitive type or a String that does not complete abruptly and is composed using only the following:
* Literals of primitive type and literals of type String (�3.10.5) * Casts to primitive types and casts to type String * The unary operators +, -, ~, and ! (but not ++ or --) * The multiplicative operators *, /, and % * The additive operators + and - * The shift operators <<, >>, and >>> * The relational operators <, <=, >, and >= (but not instanceof) * The equality operators == and != * The bitwise and logical operators &, ^, and | * The conditional-and operator && and the conditional-or operator || * The ternary conditional operator ? : * Parenthesized expressions whose contained expression is a constant expression. * Simple names that refer to constant variables (�4.12.4). * Qualified names of the form TypeName . Identifier that refer to constant variables (�4.12.4).