CODEWITHSUNDEEP
javacompilationjavac
Kanteran
Kanteran

Reputation: 80

Compile with javac and convert double to float

Is it possible to set an compile option to compile this directly:

float f = 1.0;

I do not like to add the 'f' or 'F' after the '1.0'. So, can I tell the compiler to convert the double directly into a float?

Thank you for every answer.

Upvotes: 1

Views: 176

Answers (3)

Kumar Abhinav
Kumar Abhinav

Reputation: 6675

Can compiler options be customized? Yes, only for backward compatibility.

Is your case an example of backward compatibility? No.

Example: Until Java 1.4, assert was not a keyword and could be used as a variable. When compiling an assert keyword, you can use it to be used as a lower compiled class.

Upvotes: 1

Nayuki
Nayuki

Reputation: 18552

No, there is no such option in the Java compiler. It would create a slightly different, incompatible dialect of the Java programming language - which has been avoided up until now.

Generally speaking, the Java compiler and JVM are pretty strict in how they treat the language. There are very, very few options that can affect the behavior of source code at compile time or the logic at run time.

For example, these are options that do not exist in Java (but may exist in other languages):

  • Make compilation case-insensitive.
  • Run the C preprocessor on Java source code (for macros, includes, etc.).
  • Skip all array index checks at run time.
  • Throw an exception on int overflow.

The options that do exist are rather mundane:

  • Java compiler: Language version for the source code.
  • Java compiler: Character set of source file.
  • JVM memory limits.
  • JVM garbage collection algorithm tuning.

As a side note, some compile-time behaviors are even mandated by the Java Language Specification. For example, certain types of unreachable code are compile-time errors, and a compliant Java compiler must flag it as an error (not as a warning or ignore):

while (true) { ... }
foo();  // Compile-time error

Second example:

return;
bar();  // Compile-time error

(This contrasts with C/C++, where unreachable code detection is an optional diagnostic provided by compilers to help a programmer; it is not required behavior.)

Upvotes: 2

night_fury
night_fury

Reputation: 22

No you cannot change the compiler settings. You can typecast to float if you want if you don't wish to use f at the end. You can read more on [primitive data types][1] here http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

Upvotes: 0

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